Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

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

@@ -0,0 +1,48 @@
+//-----------------------------------------------------------------------------
+// Copyright (c) Microsoft Corporation.  All rights reserved.
+//-----------------------------------------------------------------------------
+
+namespace System.Activities
+{
+    using System.Runtime.Serialization;
+    using System.Runtime;
+
+    [DataContract]
+    public enum ActivityInstanceState
+    {
+        [EnumMember]
+        Executing,
+
+        [EnumMember]
+        Closed,
+
+        [EnumMember]
+        Canceled,
+
+        [EnumMember]
+        Faulted,
+
+        // If any more states are added, ensure they are also added to ActivityInstanceStateExtension.GetStateName
+    }
+
+    internal static class ActivityInstanceStateExtension
+    {
+        internal static string GetStateName(this ActivityInstanceState state)
+        {
+            switch (state)
+            {
+                case ActivityInstanceState.Executing:
+                    return "Executing";
+                case ActivityInstanceState.Closed:
+                    return "Closed";
+                case ActivityInstanceState.Canceled:
+                    return "Canceled";
+                case ActivityInstanceState.Faulted:
+                    return "Faulted";
+                default:
+                    Fx.Assert("Don't understand ActivityInstanceState named " + state.ToString());
+                    return state.ToString();
+            }
+        }
+    }
+}