Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

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

@@ -0,0 +1,46 @@
+//-----------------------------------------------------------------------------
+// Copyright (c) Microsoft Corporation.  All rights reserved.
+//-----------------------------------------------------------------------------
+
+namespace System.Activities
+{
+    using System;
+    using System.ComponentModel;
+
+    static class ArgumentDirectionHelper
+    {
+        internal static bool IsDefined(ArgumentDirection direction)
+        {
+            return (direction == ArgumentDirection.In || direction == ArgumentDirection.Out || direction == ArgumentDirection.InOut);
+        }
+
+        public static void Validate(ArgumentDirection direction, string argumentName)
+        {
+            if (!IsDefined(direction))
+            {
+                throw FxTrace.Exception.AsError(
+                    new InvalidEnumArgumentException(argumentName, (int)direction, typeof(ArgumentDirection)));
+            }
+        }
+
+        public static bool IsIn(Argument argument)
+        {
+            return ArgumentDirectionHelper.IsIn(argument.Direction);
+        }
+
+        public static bool IsIn(ArgumentDirection direction)
+        {
+            return (direction == ArgumentDirection.In) || (direction == ArgumentDirection.InOut);
+        }
+
+        public static bool IsOut(Argument argument)
+        {
+            return ArgumentDirectionHelper.IsOut(argument.Direction);
+        }
+
+        public static bool IsOut(ArgumentDirection direction)
+        {
+            return (direction == ArgumentDirection.Out) || (direction == ArgumentDirection.InOut);
+        }
+    }
+}