Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

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

@@ -0,0 +1,65 @@
+//----------------------------------------------------------------
+// Copyright (c) Microsoft Corporation.  All rights reserved.
+//----------------------------------------------------------------
+
+namespace System.Activities.Expressions
+{
+    using System;
+    using System.Activities.Statements;
+    using System.Collections.Generic;
+    using System.Collections.ObjectModel;
+    using System.ComponentModel;
+    using System.Globalization;
+
+    public sealed class ArrayItemValue<TItem> : CodeActivity<TItem>
+    {
+        public ArrayItemValue()
+            : base()
+        {
+        }
+
+        [RequiredArgument]
+        [DefaultValue(null)]
+        public InArgument<TItem[]> Array
+        {
+            get;
+            set;
+        }
+
+        [RequiredArgument]
+        [DefaultValue(null)]
+        public InArgument<int> Index
+        {
+            get;
+            set;
+        }
+
+        protected override void CacheMetadata(CodeActivityMetadata metadata)
+        {
+            RuntimeArgument arrayArgument = new RuntimeArgument("Array", typeof(TItem[]), ArgumentDirection.In, true);
+            metadata.Bind(this.Array, arrayArgument);
+
+            RuntimeArgument indexArgument = new RuntimeArgument("Index", typeof(int), ArgumentDirection.In, true);
+            metadata.Bind(this.Index, indexArgument);
+
+            metadata.SetArgumentsCollection(
+                new Collection<RuntimeArgument>
+                {
+                    arrayArgument,
+                    indexArgument,
+                });
+        }
+
+        protected override TItem Execute(CodeActivityContext context)
+        {
+            TItem[] items = this.Array.Get(context);
+            if (items == null)
+            {
+                throw FxTrace.Exception.AsError(new InvalidOperationException(SR.MemberCannotBeNull("Array", this.GetType().Name, this.DisplayName)));
+            }
+
+            int itemIndex = this.Index.Get(context);
+            return items[itemIndex];
+        }
+    }
+}