Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.Activities/System/Activities/Expressions/DelegateArgumentValue.cs

@@ -0,0 +1,61 @@
+//-----------------------------------------------------------------------------
+// Copyright (c) Microsoft Corporation.  All rights reserved.
+//-----------------------------------------------------------------------------
+
+namespace System.Activities.Expressions
+{
+    using System.Linq.Expressions;
+    using System.Runtime;
+    using System.Windows.Markup;
+
+    [ContentProperty("DelegateArgument")]
+    public sealed class DelegateArgumentValue<T> : EnvironmentLocationValue<T>
+    {
+        public DelegateArgumentValue()
+            : base()
+        {
+        }
+
+        public DelegateArgumentValue(DelegateArgument delegateArgument)
+            : this()
+        {
+            this.DelegateArgument = delegateArgument;
+        }
+
+        public DelegateArgument DelegateArgument
+        {
+            get;
+            set;
+        }
+
+        public override LocationReference LocationReference
+        {
+            get { return this.DelegateArgument; }
+        }
+
+        protected override void CacheMetadata(CodeActivityMetadata metadata)
+        {
+            if (this.DelegateArgument == null)
+            {
+                metadata.AddValidationError(SR.DelegateArgumentMustBeSet);
+            }
+            else
+            {
+                if (!this.DelegateArgument.IsInTree)
+                {
+                    metadata.AddValidationError(SR.DelegateArgumentMustBeReferenced(this.DelegateArgument.Name));
+                }
+
+                if (!metadata.Environment.IsVisible(this.DelegateArgument))
+                {
+                    metadata.AddValidationError(SR.DelegateArgumentNotVisible(this.DelegateArgument.Name));
+                }
+
+                if (!(this.DelegateArgument is DelegateInArgument<T>) && !TypeHelper.AreTypesCompatible(this.DelegateArgument.Type, typeof(T)))
+                {
+                    metadata.AddValidationError(SR.DelegateArgumentTypeInvalid(this.DelegateArgument, typeof(T), this.DelegateArgument.Type));
+                }
+            }
+        }
+    }
+}