Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.Activities/System/Activities/InOutArgument.cs

@@ -0,0 +1,217 @@
+//-----------------------------------------------------------------------------
+// Copyright (c) Microsoft Corporation.  All rights reserved.
+//-----------------------------------------------------------------------------
+
+namespace System.Activities
+{
+    using System;
+    using System.Activities.Expressions;
+    using System.Activities.XamlIntegration;
+    using System.Activities.Runtime;
+    using System.ComponentModel;
+    using System.Diagnostics.CodeAnalysis;
+    using System.Linq.Expressions;
+    using System.Runtime;
+    using System.Windows.Markup;
+
+    public abstract class InOutArgument : Argument
+    {
+        internal InOutArgument()
+        {
+            this.Direction = ArgumentDirection.InOut;
+        }
+
+        [SuppressMessage(FxCop.Category.Design, FxCop.Rule.ConsiderPassingBaseTypesAsParameters,
+            Justification = "Subclass needed to enforce rules about which directions can be referenced.")]
+        public static InOutArgument CreateReference(InOutArgument argumentToReference, string referencedArgumentName)
+        {
+            if (argumentToReference == null)
+            {
+                throw FxTrace.Exception.ArgumentNull("argumentToReference");
+            }
+
+            if (string.IsNullOrEmpty(referencedArgumentName))
+            {
+                throw FxTrace.Exception.ArgumentNullOrEmpty("referencedArgumentName");
+            }
+
+            return (InOutArgument)ActivityUtilities.CreateReferenceArgument(argumentToReference.ArgumentType, ArgumentDirection.InOut, referencedArgumentName);
+        }
+    }
+
+    [ContentProperty("Expression")]
+    [TypeConverter(typeof(InOutArgumentConverter))]
+    [ValueSerializer(typeof(ArgumentValueSerializer))]
+    public sealed class InOutArgument<T> : InOutArgument
+    {
+        public InOutArgument(Variable variable)
+            : this()
+        {
+            if (variable != null)
+            {
+                this.Expression = new VariableReference<T> { Variable = variable };
+            }
+        }
+
+        public InOutArgument(Variable<T> variable)
+            : this()
+        {
+            if (variable != null)
+            {
+                this.Expression = new VariableReference<T> { Variable = variable };
+            }
+        }
+
+        public InOutArgument(Expression<Func<ActivityContext, T>> expression)
+            : this()
+        {
+            if (expression != null)
+            {
+                this.Expression = new LambdaReference<T>(expression);
+            }
+        }
+
+        public InOutArgument(Activity<Location<T>> expression)
+            : this()
+        {
+            this.Expression = expression;
+        }
+
+        public InOutArgument()
+            : base()
+        {
+            this.ArgumentType = typeof(T);
+        }
+
+        [DefaultValue(null)]
+        public new Activity<Location<T>> Expression
+        {
+            get;
+            set;
+        }
+
+        internal override ActivityWithResult ExpressionCore
+        {
+            get
+            {
+                return this.Expression;
+            }
+            set
+            {
+                if (value == null)
+                {
+                    this.Expression = null;
+                    return;
+                }
+
+                Activity<Location<T>> typedActivity = value as Activity<Location<T>>;
+
+                if (typedActivity != null)
+                {
+                    this.Expression = typedActivity;
+                }
+                else
+                {
+                    // We do not verify compatibility here. We will do that
+                    // during CacheMetadata in Argument.Validate.
+                    this.Expression = new ActivityWithResultWrapper<Location<T>>(value);
+                }
+            }
+        }
+
+        public static implicit operator InOutArgument<T>(Variable<T> variable)
+        {
+            return FromVariable(variable);
+        }
+
+        public static implicit operator InOutArgument<T>(Activity<Location<T>> expression)
+        {
+            return FromExpression(expression);
+        }
+
+        [SuppressMessage(FxCop.Category.Design, FxCop.Rule.ConsiderPassingBaseTypesAsParameters,
+            Justification = "Generic needed for type inference")]    
+        public static InOutArgument<T> FromVariable(Variable<T> variable)
+        {
+            return new InOutArgument<T>
+            {
+                Expression = new VariableReference<T> { Variable = variable }
+            };
+        }
+
+        public static InOutArgument<T> FromExpression(Activity<Location<T>> expression)
+        {
+            if (expression == null)
+            {
+                throw FxTrace.Exception.ArgumentNull("expression");
+            }
+
+            return new InOutArgument<T>
+            {
+                Expression = expression
+            };
+        }
+
+        // Soft-Link: This method is referenced through reflection by
+        // ExpressionUtilities.TryRewriteLambdaExpression.  Update that
+        // file if the signature changes.
+        public new Location<T> GetLocation(ActivityContext context)
+        {
+            if (context == null)
+            {
+                throw FxTrace.Exception.ArgumentNull("context");
+            }
+
+            ThrowIfNotInTree();
+
+            return context.GetLocation<T>(this.RuntimeArgument);
+        }
+
+        // Soft-Link: This method is referenced through reflection by
+        // ExpressionUtilities.TryRewriteLambdaExpression.  Update that
+        // file if the signature changes.
+        public new T Get(ActivityContext context)
+        {
+            return Get<T>(context);
+        }
+
+        public void Set(ActivityContext context, T value)
+        {
+            if (context == null)
+            {
+                throw FxTrace.Exception.ArgumentNull("context");
+            }
+
+            ThrowIfNotInTree();
+
+            context.SetValue(this, value);
+        }
+
+        internal override Location CreateDefaultLocation()
+        {
+            return Argument.CreateLocation<T>();
+        }
+
+        internal override void Declare(LocationEnvironment targetEnvironment, ActivityInstance activityInstance)
+        {
+            targetEnvironment.DeclareTemporaryLocation<Location<T>>(this.RuntimeArgument, activityInstance, false);
+        }
+
+        internal override bool TryPopulateValue(LocationEnvironment targetEnvironment, ActivityInstance targetActivityInstance, ActivityExecutor executor)
+        {
+            Fx.Assert(this.Expression != null, "This should only be called for non-empty bindings.");
+
+            if (this.Expression.UseOldFastPath)
+            {
+                Location<T> argumentValue = executor.ExecuteInResolutionContext<Location<T>>(targetActivityInstance, this.Expression);
+                targetEnvironment.Declare(this.RuntimeArgument, argumentValue.CreateReference(false), targetActivityInstance);
+                return true;
+            }
+            else
+            {
+                targetEnvironment.DeclareTemporaryLocation<Location<T>>(this.RuntimeArgument, targetActivityInstance, false);
+                return false;
+            }
+        }
+    }
+}