Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.Activities/Microsoft/VisualBasic/Activities/VisualBasicSettings.cs

@@ -0,0 +1,93 @@
+//-----------------------------------------------------------------------------
+// Copyright (c) Microsoft Corporation.  All rights reserved.
+//-----------------------------------------------------------------------------
+
+namespace Microsoft.VisualBasic.Activities
+{
+    using Microsoft.VisualBasic.Activities.XamlIntegration;
+    using System;
+    using System.Activities;
+    using System.Collections.Generic;
+    using System.Runtime;
+    using System.Windows.Markup;
+    using System.Xaml;
+    using System.ComponentModel;
+    using System.Reflection;
+
+    [ValueSerializer(typeof(VisualBasicSettingsValueSerializer))]
+    [TypeConverter(typeof(VisualBasicSettingsConverter))]
+    public class VisualBasicSettings
+    {
+        
+        static readonly HashSet<VisualBasicImportReference> defaultImportReferences = new HashSet<VisualBasicImportReference>()
+        {
+            //"mscorlib"
+            new VisualBasicImportReference { Import = "System", Assembly = "mscorlib" },
+            new VisualBasicImportReference { Import = "System.Collections", Assembly = "mscorlib" },
+            new VisualBasicImportReference { Import = "System.Collections.Generic", Assembly = "mscorlib" },
+            //"system"
+            new VisualBasicImportReference { Import = "System", Assembly = "system" },
+            new VisualBasicImportReference { Import = "System.Collections.Generic", Assembly = "system" },
+            //"System.Activities"
+            new VisualBasicImportReference { Import = "System.Activities", Assembly = "System.Activities" },
+            new VisualBasicImportReference { Import = "System.Activities.Statements", Assembly = "System.Activities" },
+            new VisualBasicImportReference { Import = "System.Activities.Expressions", Assembly = "System.Activities" },
+        };
+
+        static VisualBasicSettings defaultSettings = new VisualBasicSettings(defaultImportReferences);
+
+        public VisualBasicSettings()
+        {
+            this.ImportReferences = new HashSet<VisualBasicImportReference>();
+        }
+
+        VisualBasicSettings(HashSet<VisualBasicImportReference> importReferences)
+        {
+            Fx.Assert(importReferences != null, "caller must verify");
+            this.ImportReferences = new HashSet<VisualBasicImportReference>(importReferences);
+        }
+
+        public static VisualBasicSettings Default
+        {
+            get
+            {
+                return defaultSettings;
+            }
+        }
+
+        // hide from XAML since the value serializer can't suppress yet
+        [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
+        public ISet<VisualBasicImportReference> ImportReferences
+        {
+            get;
+            private set;
+        }
+
+        internal bool SuppressXamlSerialization 
+        { 
+            get; 
+            set; 
+        }
+        
+        internal void GenerateXamlReferences(IValueSerializerContext context)
+        {
+            // promote settings to xmlns declarations
+            INamespacePrefixLookup namespaceLookup = GetService<INamespacePrefixLookup>(context);
+            foreach (VisualBasicImportReference importReference in this.ImportReferences)
+            {
+                importReference.GenerateXamlNamespace(namespaceLookup);
+            }
+        }
+
+        internal static T GetService<T>(ITypeDescriptorContext context) where T : class
+        {
+            T service = (T)context.GetService(typeof(T));
+            if (service == null)
+            {
+                throw FxTrace.Exception.AsError(new InvalidOperationException(SR.InvalidTypeConverterUsage));
+            }
+
+            return service;
+        }
+    }
+}