Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.Workflow.Activities/Executors/Helpers.cs

@@ -0,0 +1,39 @@
+using System;
+using System.Diagnostics;
+using System.Reflection;
+using System.Collections;
+using System.Workflow.ComponentModel;
+using System.Workflow.Runtime;
+using System.Xml;
+using System.Workflow.Activities.Common;
+
+namespace System.Workflow.Activities
+{
+    internal static class ActivityHelpers
+    {
+        internal static void InitializeCorrelationTokenCollection(Activity activity, CorrelationToken correlator)
+        {
+            if (correlator != null && !String.IsNullOrEmpty(correlator.OwnerActivityName))
+            {
+                string ownerActivityId = correlator.OwnerActivityName;
+                Activity owner = activity.GetActivityByName(ownerActivityId);
+                if (owner == null)
+                    owner = System.Workflow.Activities.Common.Helpers.ParseActivityForBind(activity, ownerActivityId);
+                if (owner == null)
+                    throw new ArgumentException("ownerActivity");
+
+                CorrelationTokenCollection collection = owner.GetValue(CorrelationTokenCollection.CorrelationTokenCollectionProperty) as CorrelationTokenCollection;
+                if (collection == null)
+                {
+                    collection = new CorrelationTokenCollection();
+                    owner.SetValue(CorrelationTokenCollection.CorrelationTokenCollectionProperty, collection);
+                }
+
+                if (!collection.Contains(correlator.Name))
+                {
+                    collection.Add(correlator);
+                }
+            }
+        }
+    }
+}