Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/XamlBuildTask/Microsoft/Build/Tasks/Xaml/AttributeData.cs

@@ -0,0 +1,384 @@
+//------------------------------------------------------------
+// Copyright (c) Microsoft Corporation.  All rights reserved.
+//------------------------------------------------------------
+
+namespace Microsoft.Build.Tasks.Xaml
+{
+    using System.Collections.Generic;
+    using System.Xaml;
+    using System.Collections.ObjectModel;
+    using System.Runtime;
+    using System;
+    using System.ComponentModel;
+    using System.Reflection;
+    using System.Globalization;
+    using XamlBuildTask;
+
+    public sealed class AttributeData 
+    {
+        static CultureInfo invariantEnglishUS = CultureInfo.ReadOnly(new CultureInfo("en-us", false));
+        List<AttributeParameterData> parameters;
+        Dictionary<string, AttributeParameterData> properties;        
+
+        public XamlType Type
+        {
+            get;
+            set;
+        }
+
+        public IList<AttributeParameterData> Parameters
+        {
+            get
+            {
+                if (this.parameters == null)
+                {
+                    this.parameters = new List<AttributeParameterData>();
+                }
+                return parameters;
+            }
+        }
+
+        public IDictionary<string, AttributeParameterData> Properties
+        {
+            get
+            {
+                if (properties == null)
+                {
+                    properties = new Dictionary<string, AttributeParameterData>();
+                }
+                return properties;
+            }
+        }
+
+        // We get here when we are inside x:ClassAttributes or x:Property.Attributes. We expect the first element to be the Attribute SO.
+        internal static AttributeData LoadAttributeData(XamlReader reader, NamespaceTable namespaceTable, string rootNamespace)
+        {
+            AttributeData attributeData = null;
+            reader.Read();
+            if (reader.NodeType == XamlNodeType.StartObject)
+            {
+                attributeData = new AttributeData { Type = reader.Type };
+
+                bool readNext = false;
+                while (readNext || reader.Read())
+                {
+                    namespaceTable.ManageNamespace(reader);
+                    readNext = false;
+                    if (reader.NodeType == XamlNodeType.StartMember)
+                    {
+                        if (reader.Member == XamlLanguage.Arguments)
+                        {
+                            foreach (AttributeParameterData parameterData in ReadParameters(reader.ReadSubtree(), namespaceTable, rootNamespace))
+                            {
+                                attributeData.Parameters.Add(parameterData);
+                            }
+                            readNext = true;
+                        }
+                        else if (!reader.Member.IsDirective)
+                        {
+                            KeyValuePair<string, AttributeParameterData> propertyInfo = ReadAttributeProperty(reader.ReadSubtree(), namespaceTable, rootNamespace);
+                            attributeData.Properties.Add(propertyInfo.Key, propertyInfo.Value);
+                            readNext = true;
+                        }
+                    }
+                }
+            }
+            return attributeData;
+        }
+
+        // Read the Property on the attribute.
+        private static KeyValuePair<string, AttributeParameterData> ReadAttributeProperty(XamlReader reader, NamespaceTable namespaceTable, string rootNamespace)
+        {
+            reader.Read();
+            Fx.Assert(reader.Member != null, "Member element should not be null");
+            XamlMember member = reader.Member;
+
+            AttributeParameterData propertyInfo = new AttributeParameterData();
+
+            if (member.Type != null && !member.Type.IsUnknown)
+            {
+                propertyInfo.Type = member.Type;
+            } 
+            
+            ReadParamInfo(reader, member.Type, namespaceTable, rootNamespace, propertyInfo);
+            return new KeyValuePair<string, AttributeParameterData>(member.Name, propertyInfo);
+        }
+
+        // Read the parameters on the Attribute. We expect the parameters to be in the order in which they are supposed to appear in the output code.
+        // Here we are inside x:Arguments and we expect a list of parameters.
+        private static IList<AttributeParameterData> ReadParameters(XamlReader reader, NamespaceTable namespaceTable, string rootNamespace)
+        {
+            IList<AttributeParameterData> parameters = new List<AttributeParameterData>();
+            bool readNext = false;
+            while (readNext || reader.Read())
+            {
+                readNext = false;
+                if (reader.NodeType == XamlNodeType.StartObject)
+                {
+                    AttributeParameterData paramInfo = new AttributeParameterData();
+                    ReadParamInfo(reader.ReadSubtree(), null, namespaceTable, rootNamespace, paramInfo);
+                    parameters.Add(paramInfo);
+                    readNext = true;
+                }
+            }
+            return parameters;
+        }
+
+        // Read the actual parameter info, i.e. the type of the paramter and its value.
+        // The first element could be a V or an SO.
+        private static void ReadParamInfo(XamlReader reader, XamlType type, NamespaceTable namespaceTable, string rootNamespace, AttributeParameterData paramInfo)
+        {
+            reader.Read();
+            
+            bool readNext = false;
+            do
+            {
+                readNext = false;
+                if (reader.NodeType == XamlNodeType.StartObject && reader.Type == XamlLanguage.Array)
+                {
+                    paramInfo.IsArray = true;
+                    XamlReader xamlArrayReader = reader.ReadSubtree();
+                    xamlArrayReader.Read();
+                    while (readNext || xamlArrayReader.Read())
+                    {
+                        readNext = false;
+                        if (xamlArrayReader.NodeType == XamlNodeType.StartMember && xamlArrayReader.Member.Name == "Type")
+                        {
+                            xamlArrayReader.Read();
+                            if (xamlArrayReader.NodeType == XamlNodeType.Value)
+                            {
+                                XamlType arrayType = XamlBuildTaskServices.GetXamlTypeFromString(xamlArrayReader.Value as string, namespaceTable, xamlArrayReader.SchemaContext);
+                                if (arrayType.UnderlyingType != null)
+                                {
+                                    paramInfo.Type = xamlArrayReader.SchemaContext.GetXamlType(arrayType.UnderlyingType.MakeArrayType());
+                                }
+                                else
+                                {
+                                    throw FxTrace.Exception.AsError(new InvalidOperationException(SR.AttributeParameterTypeUnknown(arrayType)));
+                                }
+                            }
+                        }
+                        else if (xamlArrayReader.NodeType == XamlNodeType.StartObject)
+                        {
+                            AttributeParameterData arrayEntry = new AttributeParameterData();
+                            ReadParamInfo(xamlArrayReader.ReadSubtree(), null, namespaceTable, rootNamespace, arrayEntry);
+                            paramInfo.AddArrayContentsEntry(arrayEntry);
+                            readNext = true;
+                        }
+                    }
+                }                    
+                else if (reader.NodeType == XamlNodeType.StartObject || reader.NodeType == XamlNodeType.Value)
+                {
+                    paramInfo.IsArray = false;
+                    string paramVal;
+                    object paramObj = null;
+                    XamlType paramType;
+                    GetParamValueType(reader.ReadSubtree(), type, namespaceTable, rootNamespace, out paramVal, out paramType, out paramObj);
+                    paramInfo.TextValue = paramVal;
+                    paramInfo.Type = paramType;
+                    paramInfo.Value = paramObj;
+                }
+            } while (readNext || reader.Read());
+        }
+
+        // Get the paramter value. If the value is enclosed inside nodes of the type, then get the parameter type as well. 
+        // Else infer the type from the type of the property.
+        private static void GetParamValueType(XamlReader reader, XamlType type, NamespaceTable namespaceTable, string rootNamespace, out string paramValue, out XamlType paramType, out Object paramObj)
+        {
+            paramValue = String.Empty;
+            paramType = type;
+            paramObj = null;
+            while (reader.Read())
+            {                
+                if (reader.NodeType == XamlNodeType.Value)
+                {
+                    if (paramType != null && paramType.UnderlyingType != null)
+                    {
+                        if (!IsSupportedParameterType(paramType.UnderlyingType) || paramType.UnderlyingType.IsArray)
+                        {
+                            throw FxTrace.Exception.AsError(new InvalidOperationException(SR.AttributeParamTypeNotSupported(paramType.UnderlyingType.FullName)));
+                        }
+
+                        paramValue = reader.Value as string;
+                        if (typeof(Type).IsAssignableFrom(paramType.UnderlyingType))
+                        {
+                            Tuple<string, Type> result = ParseParameterValueTypeName(paramValue, rootNamespace, reader.SchemaContext, namespaceTable);
+                            paramValue = result.Item1;
+                            paramObj = result.Item2;
+                        }
+                        else
+                        {
+                            paramObj = ParseParameterValue(ref paramValue, paramType);
+                        }
+                    }                    
+                    else
+                    {
+                        throw FxTrace.Exception.AsError(new InvalidOperationException(SR.AttributeParameterTypeUnknown(reader.Value as string)));
+                    }
+                }
+                else if (reader.NodeType == XamlNodeType.StartObject)
+                {
+                    if (reader.Type == XamlLanguage.Null)
+                    {
+                        paramValue = null;
+                        paramType = null;
+                    }
+                    else if (reader.Type == XamlLanguage.Type)
+                    {
+                        paramType = reader.SchemaContext.GetXamlType(typeof(Type));
+                    }
+                    else
+                    {
+                        paramType = reader.Type;
+                    }
+                }
+            }
+        }
+
+        internal static bool IsSupportedParameterType(Type type)
+        {
+            if (type.IsArray)
+            {
+                return IsSupportedParameterType(type.GetElementType());
+            }
+            return type.IsEnum || 
+                type.IsPrimitive ||
+                typeof(string) == type ||
+                typeof(Type).IsAssignableFrom(type);
+        }
+
+        // Given a live value for an attribute parameter, returns the text that needs to be
+        // code-gened for the value.
+        internal static string GetParameterText(object value, XamlType paramType)
+        {
+            Type type = paramType.UnderlyingType;
+            if (type.IsEnum)
+            {
+                // Note: this doesn't support flags enums with multiple flags set, but neither
+                // does the existing Dev10 code
+                return type.FullName + "." + value.ToString();
+            }
+            else if (typeof(Type).IsAssignableFrom(type))
+            {
+                return ((Type)value).FullName;
+            }
+            else if (type == typeof(String))
+            {
+                return (string)value;
+            }
+            else if (type.IsPrimitive)
+            {
+                TypeConverter typeConverter = paramType.TypeConverter.ConverterInstance;
+                Fx.Assert(typeConverter != null, "All primitives have TypeConverters");
+                return (string)typeConverter.ConvertTo(null, invariantEnglishUS, value, typeof(string));
+            }
+            else
+            {
+                throw Fx.AssertAndThrow("Unexpected attribute parameter type");
+            }
+        }
+
+        // Given the text for an attribute parameter, parses it to a live value (if possible).
+        internal static object GetParameterValue(ref string paramValue, XamlType paramType)
+        {
+            if (typeof(Type).IsAssignableFrom(paramType.UnderlyingType))
+            {
+                // We can't convert a CLR type name to a Type because we don't know what assembly it's from
+                return null;
+            }
+            return ParseParameterValue(ref paramValue, paramType);
+        }
+
+        // Parses a XAML QName to a CLR Type Name (and the corresponding ROL type, if available)
+        private static Tuple<string, Type> ParseParameterValueTypeName(string paramValue, string rootNamespace, XamlSchemaContext schemaContext, NamespaceTable namespaceTable)
+        {
+            XamlType xamlType = XamlBuildTaskServices.GetXamlTypeFromString(paramValue, namespaceTable, schemaContext);
+
+            string clrTypeName;
+            if (!XamlBuildTaskServices.TryGetClrTypeName(xamlType, rootNamespace, out clrTypeName))
+            {
+                throw FxTrace.Exception.AsError(new InvalidOperationException(SR.TypeNameUnknown(XamlBuildTaskServices.GetFullTypeName(xamlType))));
+            }
+            return Tuple.Create(clrTypeName, xamlType.UnderlyingType);
+        }
+
+        // Given a text value for an attribute parameter, attempts to convert it to a live value.
+        // Inverse of GetParameterText.
+        private static object ParseParameterValue(ref string paramValue, XamlType paramType)
+        {
+            object valueObj = null;
+            paramValue = NormalizeParameterText(paramValue, paramType);
+            if (!paramType.UnderlyingType.Assembly.ReflectionOnly)
+            {
+                TypeConverter typeConverter = paramType.TypeConverter.ConverterInstance;
+                if (typeConverter != null && typeConverter.CanConvertFrom(paramValue.GetType()))
+                {
+                    try
+                    {
+                        valueObj = typeConverter.ConvertFrom(null, invariantEnglishUS, paramValue);
+                    }
+                    catch (Exception e)
+                    {
+                        if (Fx.IsFatal(e))
+                        {
+                            throw;
+                        }
+                        // ----ing exceptions here to avoid throwing on 
+                        // a format that we don't recognize, but the compiler
+                        // might be able to interpret.
+                    }
+                }
+            }
+
+            return valueObj;
+        }
+
+        // Get the parameter value that is to be put in the generated code as is.
+        private static string NormalizeParameterText(string value, XamlType xamlType)
+        {
+            string paramValue;
+            Type type = xamlType.UnderlyingType;
+            Fx.Assert(!typeof(Type).IsAssignableFrom(type), "This method should not be called for Types");
+
+            if (type.IsEnum)
+            {
+                paramValue = type.FullName + "." + value;
+            }
+            else if (type == typeof(String))
+            {
+                paramValue = value;
+            }
+            else if (type.IsPrimitive)
+            {
+                value = value.TrimStart('"');
+                value = value.TrimEnd('"');
+
+                if (type == typeof(bool))
+                {
+                    if (string.Compare(value, "true", StringComparison.OrdinalIgnoreCase) == 0)
+                    {
+                        paramValue = "true";
+                    }
+                    else if (string.Compare(value, "false", StringComparison.OrdinalIgnoreCase) == 0)
+                    {
+                        paramValue = "false";
+                    }
+                    else
+                    {
+                        throw FxTrace.Exception.AsError(new InvalidOperationException(SR.UnknownBooleanValue(value)));
+                    }
+                }
+                else
+                {
+                    paramValue = value;
+                }
+            }
+            else
+            {
+                throw Fx.AssertAndThrow("Unexpected attribute parameter type");
+            }
+            return paramValue;
+        }
+    }
+}
+

mcs/class/referencesource/XamlBuildTask/Microsoft/Build/Tasks/Xaml/AttributeParameterData.cs

@@ -0,0 +1,159 @@
+//------------------------------------------------------------
+// Copyright (c) Microsoft Corporation.  All rights reserved.
+//------------------------------------------------------------
+
+namespace Microsoft.Build.Tasks.Xaml
+{
+    using System.Collections.Generic;
+    using System;
+    using System.Collections.ObjectModel;
+    using System.Runtime;
+    using System.Xaml;
+    using XamlBuildTask;
+
+    // This class is modal. The following properties are set in different modes:
+    //                 Type  TextValue   Value   ArrayContents
+    // x:Null 
+    // x:Array          x                             x
+    // Known Value      x        x         x
+    // Unknown Value    x        x
+    //
+    // While this modality is not ideal, it's preferable to having multiple concrete classes
+    // and requiring the user to down-cast.
+    // However, we can't make the class mutable and expect users to maintain the modality.
+    // So it's publicly immutable and has constructors for various modes (except for x:Null,
+    // which the user can replicate by passing value == null and type == object).
+    public sealed class AttributeParameterData
+    {
+        List<AttributeParameterData> arrayContents;
+
+        public AttributeParameterData(XamlType type, string textValue)
+        {
+            ValidateType(type);
+            if (textValue == null && type.UnderlyingType.IsValueType)
+            {
+                throw FxTrace.Exception.Argument("value", SR.AttributeValueNotNullable(type.UnderlyingType));
+            }
+
+            this.Type = type;
+            if (textValue != null)
+            {
+                this.Value = AttributeData.GetParameterValue(ref textValue, type);
+                this.TextValue = textValue;
+            }
+        }
+
+        public AttributeParameterData(XamlType type, object value)
+        {
+            ValidateType(type);
+            if (value == null && type.UnderlyingType.IsValueType)
+            {
+                throw FxTrace.Exception.Argument("value", SR.AttributeValueNotNullable(type.UnderlyingType));
+            }
+            if (value != null && !type.UnderlyingType.IsAssignableFrom(value.GetType()))
+            {
+                throw FxTrace.Exception.Argument("value", SR.AttributeValueNotAssignableToType(value.GetType(), type.UnderlyingType));
+            }
+
+            this.Type = type;
+            if (value != null)
+            {
+                if (type.UnderlyingType.IsArray)
+                {
+                    Array array = (Array)value;
+                    XamlType elementType = type.SchemaContext.GetXamlType(type.UnderlyingType.GetElementType());
+                    this.arrayContents = new List<AttributeParameterData>();
+                    foreach (object item in array)
+                    {
+                        this.arrayContents.Add(new AttributeParameterData(elementType, item));
+                    }
+                    this.IsArray = true;
+                }
+                else
+                {
+                    this.Value = value;
+                    this.TextValue = AttributeData.GetParameterText(value, type);
+                }
+            }
+        }
+
+        public AttributeParameterData(XamlType type, IEnumerable<AttributeParameterData> arrayContents)
+        {
+            ValidateType(type);
+            if (!type.UnderlyingType.IsArray)
+            {
+                throw FxTrace.Exception.Argument("type", SR.AttributeTypeIsNotArray(type));
+            }
+            if (arrayContents == null)
+            {
+                throw FxTrace.Exception.ArgumentNull("arrayContents");
+            }
+
+            this.Type = type;
+            this.arrayContents = new List<AttributeParameterData>(arrayContents);
+            this.IsArray = true;
+        }
+
+        internal AttributeParameterData()
+        {
+            TextValue = String.Empty;
+            IsArray = false;
+        }
+
+        public string TextValue 
+        { 
+            get;
+            internal set; 
+        }
+
+        public object Value
+        {
+            get;
+            internal set;
+        }
+        
+        public XamlType Type 
+        { 
+            get; 
+            internal set;
+        }
+
+        public ReadOnlyCollection<AttributeParameterData> ArrayContents
+        {
+            get
+            {
+                return this.arrayContents == null ? null : this.arrayContents.AsReadOnly();
+            }
+        }
+
+        internal void AddArrayContentsEntry(AttributeParameterData arrayContentsEntry)
+        {
+            if (arrayContentsEntry != null)
+            {
+                if (this.arrayContents == null)
+                {
+                    this.arrayContents = new List<AttributeParameterData>();
+                }
+                this.arrayContents.Add(arrayContentsEntry);
+            }
+        }      
+
+        internal bool IsArray { get; set; }
+
+        private static void ValidateType(XamlType type)
+        {
+            if (type == null)
+            {
+                throw FxTrace.Exception.ArgumentNull("type");
+            }
+            if (type.IsUnknown)
+            {
+                throw FxTrace.Exception.Argument("type", SR.AttributeParameterTypeUnknownNoErrNum(type));
+            }
+            if (!AttributeData.IsSupportedParameterType(type.UnderlyingType))
+            {
+                throw FxTrace.Exception.Argument("type", SR.AttributeParamTypeNotSupportedNoErrNum(type));
+            }
+        }
+    }
+}

mcs/class/referencesource/XamlBuildTask/Microsoft/Build/Tasks/Xaml/BuildExtensionContext.cs

@@ -0,0 +1,158 @@
+//----------------------------------------------------------------
+// Copyright (c) Microsoft Corporation.  All rights reserved.
+//----------------------------------------------------------------
+
+namespace Microsoft.Build.Tasks.Xaml
+{
+    using System;
+    using System.Collections.Generic;
+    using System.Collections.ObjectModel;
+    using Microsoft.Build.Utilities;
+
+    public class BuildExtensionContext
+    {
+        static readonly IList<string> emptyList = new List<string>(0);
+        List<string> references;
+        List<string> sourceCodeFiles;
+        List<string> generatedFiles;
+        List<string> generatedResourceFiles;
+
+        internal BuildExtensionContext()
+        {
+        }
+
+        public string AssemblyName
+        { 
+            get; 
+            internal set; 
+        }
+
+        public bool IsInProcessXamlMarkupCompile
+        { 
+            get; 
+            internal set; 
+        }
+
+        public string Language
+        { 
+            get; 
+            internal set; 
+        }
+
+        public string OutputPath
+        { 
+            get; 
+            internal set; 
+        }
+
+        public ReadOnlyCollection<string> References
+        {
+            get
+            {
+                if (this.references == null)
+                {
+                    this.references = new List<string>();
+                }
+                return this.references.AsReadOnly();
+            }
+        }
+
+        public string RootNamespace
+        { 
+            get; 
+            internal set; 
+        }
+
+        public ReadOnlyCollection<string> SourceCodeFiles
+        {
+            get
+            {
+                if (this.sourceCodeFiles == null)
+                {
+                    this.sourceCodeFiles = new List<string>();
+                }
+                return this.sourceCodeFiles.AsReadOnly();
+            }
+        }
+
+       
+
+        public string LocalAssembly
+        {
+            get;
+            internal set;
+        }
+
+        public TaskLoggingHelper XamlBuildLogger
+        {
+            get;
+            internal set;
+        }
+
+        public ReadOnlyCollection<string> GeneratedFiles
+        {
+            get
+            {
+                if (this.generatedFiles == null)
+                {
+                    this.generatedFiles = new List<string>();
+                }
+                return this.generatedFiles.AsReadOnly();
+            }
+        }
+
+        public ReadOnlyCollection<string> GeneratedResourceFiles
+        {
+            get
+            {
+                if (this.generatedResourceFiles == null)
+                {
+                    this.generatedResourceFiles = new List<string>();
+                }
+                return this.generatedResourceFiles.AsReadOnly();
+            }
+        }
+
+        public void AddGeneratedFile(string fileName)
+        {
+            if (this.generatedFiles == null)
+            {
+                this.generatedFiles = new List<string>();
+            }
+            this.generatedFiles.Add(fileName);         
+        }
+
+        public void AddGeneratedResourceFile(string fileName)
+        {
+            if (this.generatedResourceFiles == null)
+            {
+                this.generatedResourceFiles = new List<string>();
+            }
+            this.generatedResourceFiles.Add(fileName);
+        }
+
+        internal void AddReferences(IList<string> references)
+        {
+            if (references != null)
+            {
+                if (this.references == null)
+                {
+                    this.references = new List<string>();
+                }
+                this.references.AddRange(references);
+            }
+        }
+
+        internal void AddSourceCodeFiles(IList<string> sourceCodeFiles)
+        {
+            if (sourceCodeFiles != null)
+            {
+                if (this.sourceCodeFiles == null)
+                {
+                    this.sourceCodeFiles = new List<string>();
+                }
+                this.sourceCodeFiles.AddRange(sourceCodeFiles);
+            }
+        }
+    }
+}

mcs/class/referencesource/XamlBuildTask/Microsoft/Build/Tasks/Xaml/ClassData.cs

@@ -0,0 +1,154 @@
+//------------------------------------------------------------
+// Copyright (c) Microsoft Corporation.  All rights reserved.
+//------------------------------------------------------------
+
+namespace Microsoft.Build.Tasks.Xaml
+{
+    using System;
+    using System.Collections.Generic;
+    using System.Xml.Linq;
+    using System.Xaml.Schema;
+    using System.Xaml;
+    using System.Windows.Markup;
+    using System.Runtime;
+    using System.Reflection;
+    using System.Collections.ObjectModel;
+    using System.Collections;
+    
+    public class ClassData
+    {
+        [Fx.Tag.Queue(typeof(NamedObject), Scope = Fx.Tag.Strings.DeclaringInstance)]
+        private List<NamedObject> namedObjects;
+        [Fx.Tag.Queue(typeof(string), Scope = Fx.Tag.Strings.DeclaringInstance)]
+        private List<string> codeSnippets;
+        List<AttributeData> attributes;
+        PropertyDataCollection properties;
+
+        public ClassData()
+        {
+            this.IsPublic = true;
+        }
+
+        public XamlType BaseType
+        {
+            get;
+            set;
+        }
+
+        public IList<String> CodeSnippets
+        {
+            get
+            {
+                if (codeSnippets == null)
+                {
+                    codeSnippets = new List<String>();
+                }
+                return codeSnippets;
+            }
+        }
+
+        public string EmbeddedResourceFileName
+        { 
+            get; 
+            internal set; 
+        }
+
+        public KeyedCollection<string, PropertyData> Properties
+        {
+            get
+            {
+                if (this.properties == null)
+                {
+                    this.properties = new PropertyDataCollection();
+                }
+                return this.properties;
+            }
+        }
+
+        public IList<AttributeData> Attributes
+        {
+            get
+            {                
+                if (attributes == null)
+                {
+                    attributes = new List<AttributeData>();
+                }
+                return attributes;
+            }
+        }
+
+        public string Name
+        { 
+            get;
+            internal set; 
+        }
+        
+        public IList<NamedObject> NamedObjects
+        {
+            get
+            {
+                if (namedObjects == null)
+                {
+                    namedObjects = new List<NamedObject>();
+                }
+                return namedObjects;
+            }
+        }
+
+        public String Namespace
+        { 
+            get;
+            internal set;
+        }             
+
+        public XamlNodeList EmbeddedResourceXaml
+        {
+            get;
+            set;
+        }
+
+        public bool IsPublic
+        {
+            get;
+            set;
+        }       
+        
+        public string FileName
+        {
+            get; 
+            internal set;
+        }
+
+        public string HelperClassFullName
+        {
+            get;
+            internal set;
+        }
+
+        internal String RootNamespace
+        {
+            get;
+            set;
+        }  
+
+        internal bool SourceFileExists
+        {
+            get;
+            set;
+        }
+
+        internal bool RequiresCompilationPass2
+        {
+            get;
+            set;
+        }
+        
+        class PropertyDataCollection : KeyedCollection<string, PropertyData>
+        {
+            protected override string GetKeyForItem(PropertyData item)
+            {
+                return item.Name;
+            }
+        }
+    }
+}

mcs/class/referencesource/XamlBuildTask/Microsoft/Build/Tasks/Xaml/ClassValidator.cs

@@ -0,0 +1,79 @@
+//------------------------------------------------------------
+// Copyright (c) Microsoft Corporation.  All rights reserved.
+//------------------------------------------------------------
+
+namespace Microsoft.Build.Tasks.Xaml
+{
+    using System.Collections.Generic;
+    using System.Diagnostics;
+    using System.Xaml;
+    using System.Runtime;
+    using System.Reflection;
+    using System;
+    using System.Xaml.Schema;
+    using Microsoft.Build.Utilities;
+    using XamlBuildTask;
+
+    class ClassValidator
+    {
+        string xamlFileName;
+        IList<LogData> eventArgs;
+        Assembly localAssembly;
+        string rootNamespace;
+
+        public ClassValidator(string xamlFileName, Assembly localAssembly, string rootNamespace)
+        {
+            this.xamlFileName = xamlFileName;
+            this.localAssembly = localAssembly;
+            this.eventArgs = null;
+            this.rootNamespace = rootNamespace;
+        }
+
+        public bool ValidateXaml(XamlReader xamlReader, bool failOnFirstError, string assemblyName, out IList<LogData> validationErrors)
+        {
+            if (xamlReader == null)
+            {
+                throw FxTrace.Exception.ArgumentNull("xamlReader");
+            }
+            validationErrors = null;
+
+            // We loop through the provided XAML using a XamlValidatingReader to ensure that:
+            //  1. XAML is valid.
+            //  2. All types referenced in XAML are validate-able. At this point, any types defined in the local 
+            //     assembly should be referenced, so this should be possible.
+            XamlValidatingReader reader = new XamlValidatingReader(xamlReader, this.localAssembly, rootNamespace, assemblyName);
+            reader.OnValidationError += new EventHandler<ValidationEventArgs>(reader_OnValidationError);
+            while (reader.Read())
+            {
+                if (this.eventArgs != null && failOnFirstError)
+                {
+                    validationErrors = this.eventArgs;
+                    return false;
+                }
+            }
+
+            validationErrors = this.eventArgs;
+            if (validationErrors != null && validationErrors.Count > 0)
+            {
+                return false;
+            }
+            return true;
+        }
+
+        void reader_OnValidationError(object sender, ValidationEventArgs e)
+        {
+            if (this.eventArgs == null)
+            {
+                this.eventArgs = new List<LogData>();
+            }
+
+            this.eventArgs.Add(new LogData()
+            {
+                FileName = this.xamlFileName,
+                LineNumber = e.LineNumber,
+                LinePosition = e.LinePosition,
+                Message = e.Message
+            });
+        }
+    }
+}

mcs/class/referencesource/XamlBuildTask/Microsoft/Build/Tasks/Xaml/CodeDomExtensionMethods.cs

@@ -0,0 +1,45 @@
+//------------------------------------------------------------
+// Copyright (c) Microsoft Corporation.  All rights reserved.
+//------------------------------------------------------------
+
+namespace Microsoft.Build.Tasks.Xaml
+{
+    using System;
+    using System.CodeDom;
+
+    static class CodeDomExtensionMethods
+    {
+        internal static CodeVariableReferenceExpression DeclareVar(this CodeStatementCollection block, Type type,
+            string name, CodeExpression initExpression)
+        {
+            block.Add(new CodeVariableDeclarationStatement()
+                {
+                    Name = name,
+                    Type = new CodeTypeReference(type),
+                    InitExpression = initExpression
+                });
+            return new CodeVariableReferenceExpression(name);
+        }
+
+        internal static CodeFieldReferenceExpression Field(this CodeExpression targetObject, string fieldName)
+        {
+            return new CodeFieldReferenceExpression(targetObject, fieldName);
+        }
+
+        internal static CodeMethodInvokeExpression Invoke(this CodeExpression targetObject, string methodName,
+            params CodeExpression[] parameters)
+        {
+            return new CodeMethodInvokeExpression(targetObject, methodName, parameters);
+        }
+
+        internal static CodeObjectCreateExpression New(this Type type, params CodeExpression[] parameters)
+        {
+            return new CodeObjectCreateExpression(type, parameters);
+        }
+
+        internal static CodePropertyReferenceExpression Property(this CodeExpression targetObject, string propertyName)
+        {
+            return new CodePropertyReferenceExpression(targetObject, propertyName);
+        }
+    }
+}

mcs/class/referencesource/XamlBuildTask/Microsoft/Build/Tasks/Xaml/CompilationPass2Task.cs

@@ -0,0 +1,315 @@
+//------------------------------------------------------------
+// Copyright (c) Microsoft Corporation.  All rights reserved.
+//------------------------------------------------------------
+
+namespace Microsoft.Build.Tasks.Xaml
+{
+    using System;
+    using System.Collections.Generic;
+    using System.Linq;
+    using System.Reflection;
+    using System.Runtime;
+    using Microsoft.Build.Framework;
+    using Microsoft.Build.Utilities;
+    using XamlBuildTask;
+
+    [Fx.Tag.XamlVisible(true)]
+    public class CompilationPass2Task : Task
+    {
+        List<ITaskItem> generatedCodeFiles = new List<ITaskItem>();
+
+        // We will do Dev10 behavior if NONE of the new required properties are specified. This can happen
+        // if a Dev10 version of the Microsoft.Xaml.Targets file is being used with Dev11 installed.
+        // The new required properties for Dev11 are:
+        //    Language
+        //    OutputPath
+        //    MSBuildProjectDirectory
+        //    ApplicationMarkupWithTypeName
+        //
+        // If ANY of these are specified, then ALL must be specified.
+        bool supportExtensions = false;
+        string language;
+        string outputPath;
+        string msBuildProjectDirectory;
+        ITaskItem[] applicationMarkupWithTypeName;
+
+        public CompilationPass2Task()
+        {
+        }
+
+        [Fx.Tag.KnownXamlExternal]
+        public ITaskItem[] ApplicationMarkup { get; set; }
+
+        public string AssemblyName
+        { get; set; }
+
+        [Fx.Tag.KnownXamlExternal]
+        public ITaskItem[] References { get; set; }
+
+        // Required in Dev11, but for backward compatibility with a Dev10 targets file, not marking as required.
+        public string Language
+        {
+            get
+            {
+                return this.language;
+            }
+
+            set
+            {
+                this.language = value;
+                this.supportExtensions = true;
+            }
+        }
+
+        // Required in Dev11, but for backward compatibility with a Dev10 targets file, not marking as required.
+        public string OutputPath
+        {
+            get
+            {
+                return this.outputPath;
+            }
+
+            set
+            {
+                this.outputPath = value;
+                this.supportExtensions = true;
+            }
+        }
+
+        // Required in Dev11, but for backward compatibility with a Dev10 targets file, not marking as required.
+        public string MSBuildProjectDirectory
+        {
+            get
+            {
+                return this.msBuildProjectDirectory;
+            }
+
+            set
+            {
+                this.msBuildProjectDirectory = value;
+                this.supportExtensions = true;
+            }
+        }
+
+        public bool IsInProcessXamlMarkupCompile
+        { get; set; }
+
+        [Fx.Tag.KnownXamlExternal]
+        public ITaskItem[] SourceCodeFiles
+        { get; set; }
+        
+        public ITaskItem[] XamlBuildTypeInspectionExtensionNames
+        { get; set; }
+
+        // Required in Dev11, but for backward compatibility with a Dev10 targets file, not marking as required.
+        public ITaskItem[] ApplicationMarkupWithTypeName
+        {
+            get
+            {
+                return this.applicationMarkupWithTypeName;
+            }
+
+            set
+            {
+                this.applicationMarkupWithTypeName = value;
+                this.supportExtensions = true;
+            }
+        }
+
+        public string LocalAssemblyReference
+        { get; set; }
+
+        public string RootNamespace
+        { get; set; }
+
+        public string BuildTaskPath
+        { get; set; }
+
+        [Output]
+        public ITaskItem[] ExtensionGeneratedCodeFiles
+        {
+            get
+            {
+                return generatedCodeFiles.ToArray();
+            }
+            set
+            {
+                generatedCodeFiles = new List<ITaskItem>(value);
+            }
+        }
+
+        public override bool Execute()
+        {
+            AppDomain appDomain = null;
+
+            try
+            {
+                ValidateRequiredDev11Properties();
+
+                appDomain = XamlBuildTaskServices.CreateAppDomain("CompilationPass2AppDomain_" + Guid.NewGuid(), BuildTaskPath);
+
+                CompilationPass2TaskInternal wrapper = (CompilationPass2TaskInternal)appDomain.CreateInstanceAndUnwrap(
+                    Assembly.GetExecutingAssembly().FullName,
+                    typeof(CompilationPass2TaskInternal).FullName);
+
+                PopulateBuildArtifacts(wrapper);
+
+                bool ret = wrapper.Execute();
+
+                ExtractBuiltArtifacts(wrapper);
+
+                if (!ret)
+                {
+                    foreach (LogData logData in wrapper.LogData)
+                    {
+                        XamlBuildTaskServices.LogException(
+                            this.Log,
+                            logData.Message,
+                            logData.FileName,
+                            logData.LineNumber,
+                            logData.LinePosition);
+                    }
+                }
+
+                return ret;
+            }
+            catch (Exception e)
+            {
+                if (Fx.IsFatal(e))
+                {
+                    throw;
+                }
+
+                XamlBuildTaskServices.LogException(this.Log, e.Message);
+                return false;
+            }
+            finally
+            {
+                if (appDomain != null)
+                {
+                    AppDomain.Unload(appDomain);
+                }
+            }
+        }
+
+        string SeparateWithComma(string originalString, string stringToAppend)
+        {
+            if (!String.IsNullOrEmpty(originalString))
+            {
+                return String.Join(", ", originalString, stringToAppend);
+            }
+            else
+            {
+                return stringToAppend;
+            }
+        }
+
+        void ValidateRequiredDev11Properties()
+        {
+            if (this.supportExtensions)
+            {
+                string requiredPropertiesNotSpecified = "";
+                if (this.language == null)
+                {
+                    requiredPropertiesNotSpecified = SeparateWithComma(requiredPropertiesNotSpecified, "Language");
+                }
+                if (this.outputPath == null)
+                {
+                    requiredPropertiesNotSpecified = SeparateWithComma(requiredPropertiesNotSpecified, "OutputPath");
+                }
+                if (this.msBuildProjectDirectory == null)
+                {
+                    requiredPropertiesNotSpecified = SeparateWithComma(requiredPropertiesNotSpecified, "MSBuildProjectDirectory");
+                }
+                if (this.applicationMarkupWithTypeName == null)
+                {
+                    requiredPropertiesNotSpecified = SeparateWithComma(requiredPropertiesNotSpecified, "ApplicationMarkupWithTypeName");
+                }
+                if (!String.IsNullOrEmpty(requiredPropertiesNotSpecified))
+                {
+                    throw FxTrace.Exception.AsError(new InvalidOperationException(SR.MissingRequiredParametersCompilationPass2Task(requiredPropertiesNotSpecified)));
+                }
+            }
+        }
+
+        void PopulateBuildArtifacts(CompilationPass2TaskInternal wrapper)
+        {
+            if (!this.supportExtensions)
+            {
+                IList<string> applicationMarkup = new List<string>(this.ApplicationMarkup.Length);
+                foreach (ITaskItem taskItem in this.ApplicationMarkup)
+                {
+                    applicationMarkup.Add(taskItem.ItemSpec);
+                }
+                wrapper.ApplicationMarkup = applicationMarkup;
+            }
+
+            wrapper.SupportExtensions = this.supportExtensions;
+
+            wrapper.BuildLogger = this.Log;
+
+            wrapper.References = this.References
+                .Select(i => new DelegatingTaskItem(i) as ITaskItem).ToList();
+
+            wrapper.LocalAssemblyReference = this.LocalAssemblyReference;
+
+            wrapper.AssemblyName = this.AssemblyName;
+
+            wrapper.RootNamespace = this.RootNamespace;
+
+            wrapper.Language = this.Language;
+
+            wrapper.OutputPath = this.OutputPath;
+
+            wrapper.IsInProcessXamlMarkupCompile = this.IsInProcessXamlMarkupCompile;
+
+            wrapper.MSBuildProjectDirectory = this.MSBuildProjectDirectory;
+
+            IList<string> sourceCodeFiles = null;
+            if (this.SourceCodeFiles != null)
+            {
+                sourceCodeFiles = new List<string>(this.SourceCodeFiles.Length);
+                foreach (ITaskItem taskItem in this.SourceCodeFiles)
+                {
+                    sourceCodeFiles.Add(taskItem.ItemSpec);
+                }
+            }
+            wrapper.SourceCodeFiles = sourceCodeFiles;
+
+            if (this.supportExtensions)
+            {
+                wrapper.XamlBuildTaskTypeInspectionExtensionNames = XamlBuildTaskServices.GetXamlBuildTaskExtensionNames(this.XamlBuildTypeInspectionExtensionNames);
+
+                // Here we create a Dictionary of Type Full Name and corresponding TaskItem
+                // This is passed to the extensions which enables them to look up 
+                // metadata about a type like file name.
+                IDictionary<string, ITaskItem> applicationMarkupWithTypeName = null;
+                if (this.ApplicationMarkupWithTypeName != null)
+                {
+                    applicationMarkupWithTypeName = new Dictionary<string, ITaskItem>();
+                }
+                foreach (ITaskItem taskItem in this.ApplicationMarkupWithTypeName)
+                {
+                    string typeName = taskItem.GetMetadata("typeName");
+                    if (!String.IsNullOrWhiteSpace(typeName))
+                    {
+                        applicationMarkupWithTypeName.Add(typeName, new DelegatingTaskItem(taskItem));
+                    }
+                }
+                wrapper.ApplicationMarkupWithTypeName = applicationMarkupWithTypeName;
+            }
+        }
+
+        void ExtractBuiltArtifacts(CompilationPass2TaskInternal wrapper)
+        {
+            if (wrapper.GeneratedCodeFiles == null)
+            {
+                return;
+            }
+            foreach (string code in wrapper.GeneratedCodeFiles)
+            {
+                this.generatedCodeFiles.Add(new TaskItem(code));
+            }
+        }
+    }
+}

mcs/class/referencesource/XamlBuildTask/Microsoft/Build/Tasks/Xaml/CompilationPass2TaskInternal.cs

@@ -0,0 +1,362 @@
+//------------------------------------------------------------
+// Copyright (c) Microsoft Corporation.  All rights reserved.
+//------------------------------------------------------------
+
+namespace Microsoft.Build.Tasks.Xaml
+{
+    using System;
+    using System.Collections.Generic;
+    using System.IO;
+    using System.Xaml;
+    using System.Xaml.Schema;
+    using System.Xml;
+    using System.Reflection;
+    using System.Runtime;
+    using System.Runtime.Remoting.Lifetime;
+    using System.Globalization;
+    using Microsoft.Build.Utilities;
+    using XamlBuildTask;
+    using Microsoft.Build.Framework;
+
+    internal class CompilationPass2TaskInternal : MarshalByRefObject 
+    {
+        IList<string> applicationMarkup;
+        IList<ITaskItem> references;
+        IList<LogData> logData;
+        IList<string> sourceCodeFiles;
+        IList<string> generatedCodeFiles;
+        XamlBuildTypeInspectionExtensionContext buildContextForExtensions;
+        IDictionary<string, ITaskItem> applicationMarkupWithTypeName;
+        
+        // Set the lease lifetime according to the environment variable with the name defined by RemotingLeaseLifetimeInMinutesEnvironmentVariableName
+        public override object InitializeLifetimeService()
+        {
+            ILease lease = (ILease)base.InitializeLifetimeService();
+            XamlBuildTaskLeaseLifetimeHelper.SetLeaseLifetimeFromEnvironmentVariable(lease);
+            return lease;
+        }
+
+        public IList<string> ApplicationMarkup
+        {
+            get
+            {
+                if (this.applicationMarkup == null)
+                {
+                    this.applicationMarkup = new List<string>();
+                }
+                return this.applicationMarkup;
+            }
+            set
+            {
+                this.applicationMarkup = value;
+            }
+        }
+
+        public string AssemblyName
+        { get; set; }
+
+        public TaskLoggingHelper BuildLogger
+        { get; set; }
+
+        public string LocalAssemblyReference
+        { get; set; }
+
+        public string RootNamespace
+        { get; set; }
+
+        public string MSBuildProjectDirectory
+        { get; set; }
+
+        public IList<LogData> LogData
+        {
+            get
+            {
+                if (this.logData == null)
+                {
+                    this.logData = new List<LogData>();
+                }
+                return this.logData;
+            }
+        }
+
+        public IList<ITaskItem> References
+        {
+            get
+            {
+                if (this.references == null)
+                {
+                    this.references = new List<ITaskItem>();
+                }
+                return this.references;
+            }
+            set
+            {
+                this.references = value;
+            }
+        }
+        
+        public IList<string> SourceCodeFiles
+        {
+            get
+            {
+                if (this.sourceCodeFiles == null)
+                {
+                    this.sourceCodeFiles = new List<string>();
+                }
+                return this.sourceCodeFiles;
+            }
+            set
+            {
+                this.sourceCodeFiles = value;
+            }
+        }
+
+        public IList<string> GeneratedCodeFiles
+        {
+            get
+            {
+                if (this.generatedCodeFiles == null)
+                {
+                    this.generatedCodeFiles = new List<string>();
+                }
+                return generatedCodeFiles;
+            }
+        }
+
+        public IDictionary<string, ITaskItem> ApplicationMarkupWithTypeName
+        {
+            get
+            {
+                if (this.applicationMarkupWithTypeName == null)
+                {
+                    this.applicationMarkupWithTypeName = new Dictionary<string, ITaskItem>();
+                }
+                return applicationMarkupWithTypeName;
+            }
+            set
+            {
+                this.applicationMarkupWithTypeName = value;
+            }
+        }
+
+        public string OutputPath
+        { get; set; }
+
+        public string Language
+        { get; set; }
+
+        public bool IsInProcessXamlMarkupCompile
+        { get; set; }
+
+        public IList<Tuple<string, string, string>> XamlBuildTaskTypeInspectionExtensionNames
+        { get; set; }
+
+        public IList<Tuple<AssemblyName, Assembly>> ReferencedAssemblies
+        { get; set; }
+
+        public bool SupportExtensions
+        { get; set; }
+
+        public XamlBuildTypeInspectionExtensionContext BuildContextForExtensions
+        {
+            get
+            {
+                if (this.buildContextForExtensions == null)
+                {
+                    XamlBuildTypeInspectionExtensionContext local = new XamlBuildTypeInspectionExtensionContext();              
+                    local.AssemblyName = this.AssemblyName;
+                    local.IsInProcessXamlMarkupCompile = this.IsInProcessXamlMarkupCompile;
+                    local.Language = this.Language;
+                    local.OutputPath = this.OutputPath;
+                    local.RootNamespace = this.RootNamespace;
+                    local.AddSourceCodeFiles(this.SourceCodeFiles);
+                    local.LocalAssembly = this.LocalAssemblyReference;
+                    local.XamlBuildLogger = this.BuildLogger;
+                    local.AddReferences(XamlBuildTaskServices.GetReferences(this.references));
+                    local.AddApplicationMarkupWithTypeName(this.ApplicationMarkupWithTypeName);
+
+                    this.buildContextForExtensions = local;
+                }
+                return this.buildContextForExtensions;
+            }
+        }
+
+        public bool Execute()
+        {
+            try
+            {
+                if ((!this.SupportExtensions) && ((this.ApplicationMarkup == null) || this.ApplicationMarkup.Count == 0))
+                {
+                    return true;
+                }
+                else if (this.ApplicationMarkupWithTypeName == null || this.ApplicationMarkupWithTypeName.Count == 0)
+                {
+                    return true;
+                }
+
+                IList<Assembly> loadedAssemblyList = null;
+                if (this.References != null)
+                {
+                    loadedAssemblyList = XamlBuildTaskServices.Load(this.References, false);
+                }
+
+                Assembly localAssembly = null;
+                if (LocalAssemblyReference != null)
+                {
+                    try
+                    {
+                        localAssembly = XamlBuildTaskServices.Load(LocalAssemblyReference);
+                        loadedAssemblyList.Add(localAssembly);
+                    }
+                    catch (FileNotFoundException e)
+                    {
+                        XamlBuildTaskServices.LogException(this.BuildLogger, e.Message, e.FileName, 0, 0);
+                        return false;
+                    }
+                }
+
+                AppDomain.CurrentDomain.ReflectionOnlyAssemblyResolve += new ResolveEventHandler(XamlBuildTaskServices.ReflectionOnlyAssemblyResolve);
+                XamlNsReplacingContext wxsc = new XamlNsReplacingContext(loadedAssemblyList, localAssembly.GetName().Name, this.AssemblyName);
+
+                bool foundValidationErrors = false;
+                if (!this.SupportExtensions)
+                {
+                    foreach (string app in ApplicationMarkup)
+                    {
+                        try
+                        {
+                            if (!ProcessMarkupItem(app, wxsc, localAssembly))
+                            {
+                                foundValidationErrors = true;
+                            }
+                        }
+                        catch (Exception e)
+                        {
+                            if (Fx.IsFatal(e))
+                            {
+                                throw;
+                            }
+                            XamlBuildTaskServices.LogException(this.BuildLogger, e.Message, app, 0, 0);
+                            return false;
+                        }
+                    }
+                }
+                else
+                {
+                    foreach (ITaskItem app in this.ApplicationMarkupWithTypeName.Values)
+                    {
+                        string inputMarkupFile = app.ItemSpec;
+                        try
+                        {
+                            if (!ProcessMarkupItem(inputMarkupFile, wxsc, localAssembly))
+                            {
+                                foundValidationErrors = true;
+                            }
+                        }
+                        catch (Exception e)
+                        {
+                            if (Fx.IsFatal(e))
+                            {
+                                throw;
+                            }
+                            XamlBuildTaskServices.LogException(this.BuildLogger, e.Message, inputMarkupFile, 0, 0);
+                            return false;
+                        }
+                    }
+                    if (!foundValidationErrors)
+                    {
+                        foundValidationErrors = !ExecuteExtensions();
+                        if (!foundValidationErrors)
+                        {
+                            foundValidationErrors = this.BuildLogger.HasLoggedErrors;
+                        }
+                    }
+                }
+                return !foundValidationErrors;
+            }
+            catch (Exception e)
+            {
+                if (Fx.IsFatal(e))
+                {
+                    throw;
+                }
+
+                // Log unknown errors that do not originate from the task.
+                // Assumes that all known errors are logged when the exception is thrown.
+                XamlBuildTaskServices.LogException(this.BuildLogger, e.Message);
+                return false;
+            }
+        }
+
+        bool ProcessMarkupItem(string markupItem, XamlNsReplacingContext wxsc, Assembly localAssembly)
+        {
+            XamlXmlReaderSettings settings = new XamlXmlReaderSettings() { LocalAssembly = localAssembly, ProvideLineInfo = true, AllowProtectedMembersOnRoot = true };
+            using (StreamReader streamReader = new StreamReader(markupItem))
+            {
+                var xamlReader = new XamlXmlReader(XmlReader.Create(streamReader), wxsc, settings);
+                ClassValidator validator = new ClassValidator(markupItem, localAssembly, this.RootNamespace);
+                IList<LogData> validationErrors = null;
+                if (validator.ValidateXaml(xamlReader, false, this.AssemblyName, out validationErrors))
+                {
+                    return true;
+                }
+                else
+                {
+                    foreach (LogData logData in validationErrors)
+                    {
+                        this.LogData.Add(logData);
+                    }
+                    return false;
+                }
+            }
+        }
+               
+        bool ExecuteExtensions()
+        {
+            ResolveAssemblyHelper resolveAssemblyHelper = new ResolveAssemblyHelper(XamlBuildTaskServices.GetReferences(this.References));
+            AppDomain.CurrentDomain.AssemblyResolve += resolveAssemblyHelper.ResolveLocalProjectReferences;
+
+            bool extensionExecutedSuccessfully = true;
+            try
+            {                
+                IEnumerable<IXamlBuildTypeInspectionExtension> extensions =
+                    XamlBuildTaskServices.GetXamlBuildTaskExtensions<IXamlBuildTypeInspectionExtension>(
+                    this.XamlBuildTaskTypeInspectionExtensionNames,
+                    this.BuildLogger,
+                    this.MSBuildProjectDirectory);                
+
+                foreach (IXamlBuildTypeInspectionExtension extension in extensions)
+                {
+                    try
+                    {
+                        extensionExecutedSuccessfully &= extension.Execute(this.BuildContextForExtensions);
+                    }
+                    catch (FileNotFoundException e)
+                    {
+                        throw FxTrace.Exception.AsError(new LoggableException(SR.ExceptionThrownInExtension(extension.ToString(), e.GetType().ToString(), SR.AssemblyNotFound(ResolveAssemblyHelper.FileNotFound))));
+                    }
+                    catch (Exception e)
+                    {
+                        if (Fx.IsFatal(e))
+                        {
+                            throw;
+                        } 
+                        throw FxTrace.Exception.AsError(new LoggableException(SR.ExceptionThrownInExtension(extension.ToString(), e.GetType().ToString(), e.Message)));
+                    }
+                }
+                if (!this.BuildLogger.HasLoggedErrors && extensionExecutedSuccessfully)
+                {
+                    foreach (string file in this.BuildContextForExtensions.GeneratedFiles)
+                    {
+                        this.GeneratedCodeFiles.Add(file);
+                    }
+                }
+            }
+            finally
+            {
+                AppDomain.CurrentDomain.AssemblyResolve -= resolveAssemblyHelper.ResolveLocalProjectReferences;
+            }
+            return extensionExecutedSuccessfully;
+        }
+    }
+}

mcs/class/referencesource/XamlBuildTask/Microsoft/Build/Tasks/Xaml/DelegatingTaskItem.cs

@@ -0,0 +1,72 @@
+// <copyright>
+//   Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>
+
+namespace Microsoft.Build.Tasks.Xaml
+{
+    using System;
+    using System.Collections;
+    using Microsoft.Build.Framework;
+
+    // In Dev10, we allowed use of non-remotable ITaskItems. While there's not really any good scenario
+    // for those, we need to support that for back-compat. So we wrap each provided TaskItems in an MBRO.
+    internal class DelegatingTaskItem : MarshalByRefObject, ITaskItem
+    {
+        private ITaskItem underlyingItem;
+
+        // This is different from TaskItem.ctor(ITaskItem): it's a wrapper, not a clone.
+        // So any changes are propagated back to the original object.
+        public DelegatingTaskItem(ITaskItem underlyingItem)
+        {
+            this.underlyingItem = underlyingItem;
+        }
+
+        public string ItemSpec
+        {
+            get
+            {
+                return this.underlyingItem.ItemSpec;
+            }
+
+            set
+            {
+                this.underlyingItem.ItemSpec = value;
+            }
+        }
+
+        public int MetadataCount
+        {
+            get { return this.underlyingItem.MetadataCount; }
+        }
+
+        public ICollection MetadataNames
+        {
+            get { return this.underlyingItem.MetadataNames; }
+        }
+
+        public IDictionary CloneCustomMetadata()
+        {
+            return this.underlyingItem.CloneCustomMetadata();
+        }
+
+        public void CopyMetadataTo(ITaskItem destinationItem)
+        {
+            this.underlyingItem.CopyMetadataTo(destinationItem);
+        }
+
+        public string GetMetadata(string metadataName)
+        {
+            return this.underlyingItem.GetMetadata(metadataName);
+        }
+
+        public void RemoveMetadata(string metadataName)
+        {
+            this.underlyingItem.RemoveMetadata(metadataName);
+        }
+
+        public void SetMetadata(string metadataName, string metadataValue)
+        {
+            this.underlyingItem.SetMetadata(metadataName, metadataValue);
+        }
+    }
+}

mcs/class/referencesource/XamlBuildTask/Microsoft/Build/Tasks/Xaml/GenerateTemporaryAssemblyTask.cs

@@ -0,0 +1,235 @@
+//------------------------------------------------------------
+// Copyright (c) Microsoft Corporation.  All rights reserved.
+//------------------------------------------------------------
+
+namespace Microsoft.Build.Tasks.Xaml
+{
+    using System;
+    using System.CodeDom;
+    using System.CodeDom.Compiler;
+    using System.Collections;
+    using System.Collections.Generic;
+    using System.IO;
+    using System.Xaml;
+    using System.Xaml.Schema;
+    using System.Xml;
+    using System.Xml.Linq;
+    using Microsoft.Build.Framework;
+    using Microsoft.Build.Utilities;
+    using System.Reflection;
+    using System.Globalization;
+    using System.Diagnostics.CodeAnalysis;
+    using System.Runtime;
+    using Microsoft.Build.BuildEngine;
+
+    [Fx.Tag.XamlVisible(true)]
+    public class GenerateTemporaryAssemblyTask : Task
+    {
+        const string MSBuildNamespace = "http://schemas.microsoft.com/developer/msbuild/2003";
+
+        // We will do Dev10 behavior if the new required property GeneratedResourceFiles is NOT specified. This can happen
+        // if a Dev10 version of the Microsoft.Xaml.Targets file is being used with Dev11 installed.
+        bool supportExtensions = false;
+        ITaskItem[] generatedResourceFiles;
+
+        public GenerateTemporaryAssemblyTask()
+        {
+        }
+
+        [Required]
+        public string AssemblyName
+        { get; set; }
+
+        [Required]
+        public string OutputPath
+        { get; set; }
+
+        [Required]
+        public string CurrentProject
+        { get; set; }
+
+        [Fx.Tag.KnownXamlExternal]
+        [Required]
+        public ITaskItem[] SourceCodeFiles { get; set; }
+
+        [Required]
+        public string CompileTargetName
+        { get; set; }
+
+        // Required in Dev11, but for backward compatibility with a Dev10 targets file, not marking as required.
+        public ITaskItem[] GeneratedResourcesFiles 
+        {
+            get
+            {
+                return this.generatedResourceFiles;
+            }
+
+            set
+            {
+                this.generatedResourceFiles = value;
+                this.supportExtensions = true;
+            }
+        }
+
+        [Fx.Tag.KnownXamlExternal]
+        public ITaskItem[] ReferencePaths
+        { get; set; }
+
+        [Required]
+        public string ApplicationMarkupTypeName
+        { get; set; }
+
+        public override bool Execute()
+        {
+            bool retVal;
+            try
+            {
+                XDocument projectDocument = XDocument.Load(this.CurrentProject);
+                if (projectDocument != null)
+                {
+                    XElement projectElement = projectDocument.Element(XName.Get("Project", MSBuildNamespace));
+                    if (projectElement != null)
+                    {
+                        RemoveItemsByName(projectElement, this.ApplicationMarkupTypeName);
+                        RemoveItemsByName(projectElement, "Reference");
+                        RemoveItemsByName(projectElement, "ProjectReference");
+                        if (this.supportExtensions)
+                        {
+                            AddNewResourceItems(projectElement, this.GeneratedResourcesFiles);
+                        }
+                        AddNewItems(projectElement, "Compile", this.SourceCodeFiles);
+                        AddNewItems(projectElement, "ReferencePath", this.ReferencePaths);
+
+                        RemovePropertyByName(projectElement, "OutputType");
+                        RemovePropertyByName(projectElement, "AssemblyName");
+                        AddNewProperties(projectElement,
+                            new ProjectProperty[] {
+                                new ProjectProperty() { Name = "OutputType", Value = "Library" },
+                                new ProjectProperty() { Name = "AssemblyName", Value = this.AssemblyName },
+                                new ProjectProperty() { Name = "Utf8Output", Value = "true", Condition = "'$(Utf8Output)' == ''" }
+                            });
+                    }
+                }
+
+                string randomName = Path.GetRandomFileName();
+                randomName = Path.ChangeExtension(randomName, "");
+                string filename = Path.ChangeExtension(randomName, ".tmp_proj");
+                projectDocument.Save(filename);
+                Hashtable globalProperties = new Hashtable();
+                globalProperties["IntermediateOutputPath"] = this.OutputPath;
+                globalProperties["AssemblyName"] = this.AssemblyName;
+                globalProperties["OutputType"] = "Library";
+                retVal = base.BuildEngine.BuildProjectFile(filename, new string[] { this.CompileTargetName }, globalProperties, null);
+                File.Delete(filename);
+                return retVal;
+            }
+            catch (Exception e)
+            {
+                if (Fx.IsFatal(e))
+                {
+                    throw;
+                }
+
+                // Log unknown errors that do not originate from the task.
+                // Assumes that all known errors are logged when the exception is thrown.
+                XamlBuildTaskServices.LogException(this.Log, e.Message);
+                retVal = false;
+            }
+            return retVal;
+        }
+
+        void RemoveItemsByName(XElement project, string itemName)
+        {
+            if (!string.IsNullOrEmpty(itemName))
+            {
+                IEnumerable<XElement> itemGroups = project.Elements(XName.Get("ItemGroup", MSBuildNamespace));
+                itemGroups.Elements(XName.Get(itemName, MSBuildNamespace)).Remove();
+            }
+        }
+
+        void AddNewItems(XElement project, string itemName, ITaskItem[] items)
+        {
+            if (!string.IsNullOrEmpty(itemName) && items != null)
+            {
+                XElement newItemGroup = new XElement(XName.Get("ItemGroup", MSBuildNamespace));
+                project.Add(newItemGroup);
+                foreach (ITaskItem item in items)
+                {
+                    XElement newElement = new XElement(XName.Get(itemName, MSBuildNamespace));
+                    XAttribute include = new XAttribute("Include", item.ItemSpec);
+                    newElement.Add(include);
+                    newItemGroup.Add(newElement);
+                }
+            }
+        }
+
+        //<ItemGroup>
+        //    <EmbeddedResource Include="@(XamlGeneratedResources)">
+        //        <Type>Non-Resx</Type>
+        //        <WithCulture>false</WithCulture>
+        //    </EmbeddedResource>
+        //</ItemGroup>
+        void AddNewResourceItems(XElement project, ITaskItem[] items)
+        {
+            if (items != null && items.Length > 0)
+            {
+                XElement newItemGroup = new XElement(XName.Get("ItemGroup", MSBuildNamespace));
+                project.Add(newItemGroup);
+                foreach (ITaskItem item in items)
+                {
+                    XElement newResource = new XElement(XName.Get("EmbeddedResource", MSBuildNamespace));
+                    newResource.Add(new XAttribute("Include", item.ItemSpec));
+
+                    XElement type = new XElement(XName.Get("Type", MSBuildNamespace), "Non-Resx");
+                    newResource.Add(type);
+
+                    XElement withCulture = new XElement(XName.Get("WithCulture", MSBuildNamespace), "false");
+                    newResource.Add(withCulture);
+
+                    newItemGroup.Add(newResource);
+                }
+            }
+        }
+        
+        void RemovePropertyByName(XElement project, string propertyName)
+        {
+            if (!string.IsNullOrEmpty(propertyName))
+            {
+                IEnumerable<XElement> itemGroups = project.Elements(XName.Get("PropertyGroup", MSBuildNamespace));
+                itemGroups.Elements(XName.Get(propertyName, MSBuildNamespace)).Remove();
+            }
+        }
+
+        void AddNewProperties(XElement project, IEnumerable<ProjectProperty> properties)
+        {
+            if (properties != null)
+            {
+                XElement newPropertyGroup = new XElement(XName.Get("PropertyGroup", MSBuildNamespace));
+                project.Add(newPropertyGroup);
+                foreach (ProjectProperty prop in properties)
+                {
+                    if (!string.IsNullOrEmpty(prop.Name) && prop.Value != null)
+                    {
+                        XElement newElement = new XElement(XName.Get(prop.Name, MSBuildNamespace));
+                        newElement.Value = prop.Value;
+                        if (!string.IsNullOrEmpty(prop.Condition))
+                        {
+                            newElement.SetAttributeValue(XName.Get("Condition", string.Empty), prop.Condition);
+                        }
+                        newPropertyGroup.Add(newElement);
+                    }
+                }
+            }
+        }
+
+        class ProjectProperty
+        {
+            public string Name
+            { get; set; }
+            public string Value
+            { get; set; }
+            public string Condition
+            { get; set; }
+        }
+    }
+}

mcs/class/referencesource/XamlBuildTask/Microsoft/Build/Tasks/Xaml/IXamlBuildTypeGenerationExtension.cs

@@ -0,0 +1,14 @@
+//------------------------------------------------------------
+// Copyright (c) Microsoft Corporation.  All rights reserved.
+//------------------------------------------------------------
+
+
+namespace Microsoft.Build.Tasks.Xaml
+{
+    using System.CodeDom;
+
+    public interface IXamlBuildTypeGenerationExtension
+    {
+        bool Execute(ClassData classData, XamlBuildTypeGenerationExtensionContext buildContext);
+    }
+}

mcs/class/referencesource/XamlBuildTask/Microsoft/Build/Tasks/Xaml/IXamlBuildTypeInspectionExtension.cs

@@ -0,0 +1,13 @@
+//------------------------------------------------------------
+// Copyright (c) Microsoft Corporation.  All rights reserved.
+//------------------------------------------------------------
+
+namespace Microsoft.Build.Tasks.Xaml
+{
+    using System.Collections.Generic;
+
+    public interface IXamlBuildTypeInspectionExtension
+    {
+        bool Execute(XamlBuildTypeInspectionExtensionContext buildContext);
+    }
+}

mcs/class/referencesource/XamlBuildTask/Microsoft/Build/Tasks/Xaml/LogData.cs

@@ -0,0 +1,24 @@
+//------------------------------------------------------------
+// Copyright (c) Microsoft Corporation.  All rights reserved.
+//------------------------------------------------------------
+
+namespace Microsoft.Build.Tasks.Xaml
+{
+    using System;
+
+    [Serializable]
+    internal struct LogData
+    {
+        public string Message
+        { get; set; }
+
+        public string FileName
+        { get; set; }
+
+        public int LineNumber
+        { get; set; }
+
+        public int LinePosition
+        { get; set; }
+    }
+}

mcs/class/referencesource/XamlBuildTask/Microsoft/Build/Tasks/Xaml/LoggableException.cs

@@ -0,0 +1,65 @@
+//------------------------------------------------------------
+// Copyright (c) Microsoft Corporation.  All rights reserved.
+//------------------------------------------------------------
+
+namespace Microsoft.Build.Tasks.Xaml
+{
+    using System;
+    using System.Runtime.Serialization;
+
+    [Serializable]
+    class LoggableException : Exception
+    {
+        int lineNumber;
+        int linePosition;
+
+        public LoggableException()
+        {
+        }
+
+        public int LineNumber
+        {
+            get
+            {
+                return this.lineNumber;
+            }
+            set
+            {
+                this.lineNumber = value;
+            }
+        }
+
+        public int LinePosition
+        {
+            get
+            {
+                return this.linePosition;
+            }
+            set
+            {
+                this.linePosition = value;
+            }
+        }
+        
+        public LoggableException(string message)
+            : base(message)
+        {
+        }
+
+        public LoggableException(Exception innerException)
+            : base(innerException.Message, innerException)
+        {
+        }
+
+        public override void GetObjectData(SerializationInfo info, StreamingContext context)
+        {
+            base.GetObjectData(info, context);
+
+            if (info != null)
+            {
+                info.AddValue("lineNumber", this.lineNumber);
+                info.AddValue("columnNumber", this.linePosition);
+            }
+        }
+    }
+}

mcs/class/referencesource/XamlBuildTask/Microsoft/Build/Tasks/Xaml/MemberVisibility.cs

@@ -0,0 +1,16 @@
+//------------------------------------------------------------
+// Copyright (c) Microsoft Corporation.  All rights reserved.
+//------------------------------------------------------------
+
+namespace Microsoft.Build.Tasks.Xaml
+{
+    public enum MemberVisibility
+    {
+        Public,
+        Private,
+        Family,
+        Assembly,
+        FamilyOrAssembly,
+        FamilyAndAssembly
+    }
+}

mcs/class/referencesource/XamlBuildTask/Microsoft/Build/Tasks/Xaml/NamedObject.cs

@@ -0,0 +1,40 @@
+//------------------------------------------------------------
+// Copyright (c) Microsoft Corporation.  All rights reserved.
+//------------------------------------------------------------
+
+namespace Microsoft.Build.Tasks.Xaml
+{
+    using System;
+    using System.Collections.Generic;
+    using System.Xml.Linq;
+    using System.Xaml;
+    using System.Xaml.Schema;
+    using XamlBuildTask;
+
+    public class NamedObject
+    {
+        MemberVisibility visibility;
+
+        public String Name
+        { get; set; }
+
+        public XamlType Type
+        { get; set; }
+
+        public MemberVisibility Visibility
+        {
+            get
+            {
+                return this.visibility;
+            }
+            set
+            {
+                if (!Enum.IsDefined(typeof(MemberVisibility), value))
+                {
+                    throw FxTrace.Exception.AsError(new ArgumentOutOfRangeException("value"));
+                }
+                this.visibility = value;
+            }
+        }
+    }
+}

mcs/class/referencesource/XamlBuildTask/Microsoft/Build/Tasks/Xaml/NamespaceTable.cs

@@ -0,0 +1,96 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Xaml;
+
+namespace Microsoft.Build.Tasks.Xaml
+{
+    internal class NamespaceTable : IXamlNamespaceResolver
+    {
+        Dictionary<string, NamespaceDeclaration> tempNamespaceList = new Dictionary<string, NamespaceDeclaration>();
+        Stack<Dictionary<string, NamespaceDeclaration>> namespaceStack = new Stack<Dictionary<string, NamespaceDeclaration>>();
+        string localAssemblyName;
+
+        public NamespaceTable(string localAssemblyName)
+        {
+            this.localAssemblyName = localAssemblyName;
+        }
+
+        public IEnumerable<NamespaceDeclaration> GetNamespacePrefixes()
+        {
+            List<NamespaceDeclaration> list = new List<NamespaceDeclaration>();
+            HashSet<string> prefixSet = new HashSet<string>();
+            if (tempNamespaceList != null && tempNamespaceList.Count > 0)
+            {
+                foreach (NamespaceDeclaration ns in tempNamespaceList.Values)
+                {
+                    if (!prefixSet.Contains(ns.Prefix))
+                    {
+                        prefixSet.Add(ns.Prefix);
+                        list.Add(ns);
+                    }
+                }
+            }
+            foreach (Dictionary<string, NamespaceDeclaration> currentNamespaces in this.namespaceStack)
+            {
+                foreach (NamespaceDeclaration ns in currentNamespaces.Values)
+                {
+                    if (!prefixSet.Contains(ns.Prefix))
+                    {
+                        prefixSet.Add(ns.Prefix);
+                        list.Add(ns);
+                    }
+                }
+            }
+            return list;
+        }
+
+        public string GetNamespace(string prefix)
+        {
+            NamespaceDeclaration @namespace = null;
+            foreach (Dictionary<string, NamespaceDeclaration> currentNamespaces in this.namespaceStack)
+            {
+                if (null != currentNamespaces && currentNamespaces.TryGetValue(prefix, out @namespace))
+                {
+                    return @namespace.Namespace;
+                }
+            }
+
+            if (tempNamespaceList != null && tempNamespaceList.TryGetValue(prefix, out @namespace))
+            {
+                return @namespace.Namespace;
+            }
+
+            return @namespace.Namespace;
+        }
+
+        public void ManageNamespace(XamlReader reader)
+        {
+            switch (reader.NodeType)
+            {
+                case XamlNodeType.NamespaceDeclaration:
+                    tempNamespaceList.Add(reader.Namespace.Prefix,
+                        new NamespaceDeclaration(
+                        XamlBuildTaskServices.UpdateClrNamespaceUriWithLocalAssembly(reader.Namespace.Namespace, this.localAssemblyName),
+                        reader.Namespace.Prefix));
+                    break;
+                case XamlNodeType.StartObject:
+                case XamlNodeType.StartMember:
+                case XamlNodeType.GetObject:
+                    if (tempNamespaceList != null)
+                    {
+                        namespaceStack.Push(tempNamespaceList);
+                        tempNamespaceList = new Dictionary<string, NamespaceDeclaration>();
+                    }
+                    break;
+                case XamlNodeType.EndMember:
+                case XamlNodeType.EndObject:
+                    namespaceStack.Pop();
+                    break;
+                default:
+                    break;
+            }
+        }
+    }
+}

mcs/class/referencesource/XamlBuildTask/Microsoft/Build/Tasks/Xaml/PartialClassGenerationTask.cs

@@ -0,0 +1,387 @@
+//------------------------------------------------------------
+// Copyright (c) Microsoft Corporation.  All rights reserved.
+//------------------------------------------------------------
+
+namespace Microsoft.Build.Tasks.Xaml
+{
+    using System;
+    using System.Collections;
+    using System.Collections.Generic;
+    using System.IO;
+    using System.Linq;
+    using System.Reflection;
+    using System.Runtime;
+    using System.Threading;
+    using System.Xaml;
+    using Microsoft.Build.Framework;
+    using Microsoft.Build.Utilities;
+    using Microsoft.VisualStudio.Activities;
+
+    [Fx.Tag.XamlVisible(true)]
+    public class PartialClassGenerationTask : Task
+    {
+        const string DefaultGeneratedSourceExtension = "g";
+        List<ITaskItem> generatedResources = new List<ITaskItem>();
+        List<ITaskItem> generatedCodeFiles = new List<ITaskItem>();
+
+        // We will do Dev10 behavior if the new required property MSBuildProjectDirectory is NOT specified. This can happen
+        // if a Dev10 version of the Microsoft.Xaml.Targets file is being used with Dev11 installed.
+        bool supportExtensions = false;
+        string msBuildProjectDirectory;
+
+        public PartialClassGenerationTask()
+        {
+            this.GeneratedSourceExtension = DefaultGeneratedSourceExtension;
+        }
+
+        [Fx.Tag.KnownXamlExternal]
+        [Output]
+        public ITaskItem[] ApplicationMarkup { get; set; }
+
+        public string AssemblyName
+        { get; set; }
+
+        public string[] KnownReferencePaths { get; set; }
+
+        [Fx.Tag.KnownXamlExternal]
+        [Output]
+        public ITaskItem[] GeneratedResources
+        {
+            get
+            {
+                return generatedResources.ToArray();
+            }
+
+            set
+            {
+                generatedResources = new List<ITaskItem>(value);
+            }
+        }
+        
+        [Fx.Tag.KnownXamlExternal]
+        [Output]
+        public ITaskItem[] GeneratedCodeFiles
+        {
+            get
+            {
+                return generatedCodeFiles.ToArray();
+            }
+
+            set
+            {
+                generatedCodeFiles = new List<ITaskItem>(value);
+            }
+        }       
+
+        public string GeneratedSourceExtension
+        { get; set; }
+
+        [Required]
+        public string Language
+        { get; set; }
+
+        [Required]
+        public string OutputPath
+        { get; set; }
+
+        // This is Required for Dev11, but to allow things to work with a Dev10 targets file, we are not marking it required.
+        public string MSBuildProjectDirectory
+        {
+            get
+            {
+                return this.msBuildProjectDirectory;
+            }
+
+            set
+            {
+                this.msBuildProjectDirectory = value;
+                // The fact that this property is being set indicates that a Dev11 version of the targets
+                // file is being used, so we should not do Dev10 behavior.
+                this.supportExtensions = true;
+            }
+        }
+
+        [Fx.Tag.KnownXamlExternal]
+        public ITaskItem[] References
+        { get; set; }
+
+        public string RootNamespace
+        { get; set; }
+
+        [Fx.Tag.KnownXamlExternal]
+        public ITaskItem[] SourceCodeFiles
+        { get; set; }
+
+        [Output]
+        public bool RequiresCompilationPass2
+        { get; set; }
+
+        public string BuildTaskPath
+        { get; set; }
+
+        public bool IsInProcessXamlMarkupCompile
+        { get; set; }
+
+        public ITaskItem[] XamlBuildTypeGenerationExtensionNames
+        { get; set; }
+
+        public ITaskItem[] XamlBuildTypeInspectionExtensionNames
+        { get; set; }
+
+        private static AppDomain inProcessAppDomain;
+        private static Dictionary<string, DateTime> referencesTimeStampCache;
+        private Object referencesCacheLock = new Object();
+
+        public override bool Execute()
+        {
+            VSDesignerPerfEventProvider perfEventProvider = new VSDesignerPerfEventProvider();
+            perfEventProvider.WriteEvent(VSDesignerPerfEvents.XamlBuildTaskExecuteStart);
+
+            try
+            {
+                if (IsInProcessXamlMarkupCompile)
+                {
+                    bool acquiredLock = false;
+                    try
+                    {
+                        Monitor.TryEnter(referencesCacheLock, ref acquiredLock);
+                        if (acquiredLock)
+                        {
+                            return ReuseAppDomainAndExecute();
+                        }
+                        else
+                        {
+                            return GetAppDomainAndExecute();
+                        }
+                    }
+                    finally
+                    {
+                        if (acquiredLock)
+                        {
+                            Monitor.Exit(referencesCacheLock);
+                        }
+                    }
+                }
+                else
+                {
+                    return GetAppDomainAndExecute();
+                }
+            }
+            finally
+            {
+                perfEventProvider.WriteEvent(VSDesignerPerfEvents.XamlBuildTaskExecuteEnd);
+            }
+        }
+            
+        bool ReuseAppDomainAndExecute()
+        {
+            AppDomain appDomain = null;
+            bool createdNewAppDomain = false;
+            try
+            {
+                try
+                {
+                    appDomain = GetInProcessAppDomain(out createdNewAppDomain);
+                    bool ret = ExecuteInternal(appDomain);
+                    return ret;
+                }
+                catch (Exception e)
+                {
+                    if (Fx.IsFatal(e))
+                    {
+                        throw;
+                    }
+                    if (createdNewAppDomain)
+                    {
+                        XamlBuildTaskServices.LogException(this.Log, e.Message);
+                        return false;
+                    }
+                    else
+                    {
+                        AppDomain.Unload(inProcessAppDomain);
+                        inProcessAppDomain = null;
+                        return GetAppDomainAndExecute();
+                    }
+                }
+            }
+            finally
+            {
+                if (Log != null)
+                {
+                    Log.MarkAsInactive();
+                }
+            }
+        }
+
+        bool GetAppDomainAndExecute()
+        {
+            AppDomain appDomain = null;
+            try
+            {
+                appDomain = CreateNewAppDomain();
+                bool ret = ExecuteInternal(appDomain);
+                return ret;
+            }
+            catch (Exception e)
+            {
+                if (Fx.IsFatal(e))
+                {
+                    throw;
+                }
+
+                XamlBuildTaskServices.LogException(this.Log, e.Message);
+                return false;
+            }
+            finally
+            {
+                if (appDomain != null)
+                {
+                    AppDomain.Unload(appDomain);
+                }
+            }
+        }
+
+        bool ExecuteInternal(AppDomain appDomain)
+        {
+            PartialClassGenerationTaskInternal wrapper = (PartialClassGenerationTaskInternal)appDomain.CreateInstanceAndUnwrap(
+                                                        Assembly.GetExecutingAssembly().FullName,
+                                                        typeof(PartialClassGenerationTaskInternal).FullName);
+
+            PopulateBuildArtifacts(wrapper);
+
+            bool ret = wrapper.Execute();
+
+            if (ret)
+            {
+                ExtractBuiltArtifacts(wrapper);
+            }
+            return ret;
+        }
+
+        AppDomain CreateNewAppDomain()
+        {
+            return XamlBuildTaskServices.CreateAppDomain("PartialClassAppDomain_" + Guid.NewGuid(), BuildTaskPath);
+        }
+        
+        // For Intellisense builds, we re-use the AppDomain for successive builds instead of creating a new one every time, 
+        // if the references have not changed (there are no new references and they have not been updated since the last build)
+        // This method accesses the static referencesTimeStampCache (indirectly). 
+        // To ensure thread safety, this method should be called inside a lock/monitor
+        AppDomain GetInProcessAppDomain(out bool newAppDomain)
+        {
+            newAppDomain = false;
+            if (inProcessAppDomain == null)
+            {
+                inProcessAppDomain = CreateNewAppDomain();
+                newAppDomain = true;
+                UpdateReferenceCache();
+            }
+            else if (AreReferencesChanged())
+            {
+                AppDomain.Unload(inProcessAppDomain);
+                inProcessAppDomain = CreateNewAppDomain();
+                newAppDomain = true;
+                UpdateReferenceCache();
+            }
+            return inProcessAppDomain;
+        }
+
+        // This method accesses the static referencesTimeStampCache.
+        // To ensure thread safety, this method should be called inside a lock/monitor
+        bool AreReferencesChanged()
+        {
+            bool refsChanged = false;
+            if (referencesTimeStampCache == null || referencesTimeStampCache.Count != References.Length)
+            {
+                refsChanged = true;
+            }
+            else
+            {
+                foreach (var reference in References)
+                {
+                    string fullPath = Path.GetFullPath(reference.ItemSpec);
+                    DateTime timeStamp = File.GetLastWriteTimeUtc(fullPath);
+                    if (!referencesTimeStampCache.ContainsKey(fullPath)
+                        || timeStamp > referencesTimeStampCache[fullPath]
+                        || timeStamp == DateTime.MinValue)
+                    {
+                        refsChanged = true;
+                        break;
+                    }
+                }
+            }
+            return refsChanged;
+        }
+
+        // This method accesses the static referencesTimeStampCache.
+        // To ensure thread safety, this method should be called inside a lock/monitor
+        void UpdateReferenceCache()
+        {
+            referencesTimeStampCache = new Dictionary<string, DateTime>();
+            foreach (var reference in References)
+            {
+                string fullPath = Path.GetFullPath(reference.ItemSpec);
+                DateTime timeStamp = File.GetLastWriteTimeUtc(fullPath);
+                referencesTimeStampCache.Add(fullPath, timeStamp);
+            }
+        }
+
+        void PopulateBuildArtifacts(PartialClassGenerationTaskInternal wrapper)
+        {
+            IList<ITaskItem> applicationMarkup = null;
+            if (this.ApplicationMarkup != null)
+            {
+                applicationMarkup = this.ApplicationMarkup
+                    .Select(i => new DelegatingTaskItem(i) as ITaskItem).ToList();
+            }
+            wrapper.ApplicationMarkup = applicationMarkup;
+
+            wrapper.BuildLogger = this.Log;
+
+            wrapper.References = this.References
+                .Select(i => new DelegatingTaskItem(i) as ITaskItem).ToList();
+
+            IList<string> sourceCodeFiles = null;
+            if (this.SourceCodeFiles != null)
+            {
+                sourceCodeFiles = new List<string>(this.SourceCodeFiles.Length);
+                foreach (ITaskItem taskItem in this.SourceCodeFiles)
+                {
+                    sourceCodeFiles.Add(taskItem.ItemSpec);
+                }
+            }
+            wrapper.SourceCodeFiles = sourceCodeFiles;
+
+            wrapper.Language = this.Language;
+            wrapper.AssemblyName = this.AssemblyName;
+            wrapper.OutputPath = this.OutputPath;
+            wrapper.RootNamespace = this.RootNamespace;
+            wrapper.GeneratedSourceExtension = this.GeneratedSourceExtension;
+            wrapper.IsInProcessXamlMarkupCompile = this.IsInProcessXamlMarkupCompile;
+            wrapper.MSBuildProjectDirectory = this.MSBuildProjectDirectory;
+            wrapper.XamlBuildTaskTypeGenerationExtensionNames = XamlBuildTaskServices.GetXamlBuildTaskExtensionNames(this.XamlBuildTypeGenerationExtensionNames);
+            if (this.XamlBuildTypeInspectionExtensionNames != null && this.XamlBuildTypeInspectionExtensionNames.Length > 0)
+            {
+                wrapper.MarkupCompilePass2ExtensionsPresent = true;
+            }
+
+            wrapper.SupportExtensions = this.supportExtensions;
+        }        
+
+        void ExtractBuiltArtifacts(PartialClassGenerationTaskInternal wrapper)
+        {
+            foreach (string resource in wrapper.GeneratedResources)
+            {
+                this.generatedResources.Add(new TaskItem(resource));
+            }
+
+            foreach (string code in wrapper.GeneratedCodeFiles)
+            {
+                this.generatedCodeFiles.Add(new TaskItem(code));
+            }
+
+            this.RequiresCompilationPass2 = wrapper.RequiresCompilationPass2 ||
+                (this.XamlBuildTypeInspectionExtensionNames != null && this.XamlBuildTypeInspectionExtensionNames.Length > 0);
+        }
+    }
+}