Imported Upstream version 4.0.0~alpha1

Former-commit-id: 806294f5ded97629b74c85c09952f2a74fe182d9

external/referencesource/System.Workflow.Runtime/Tracking/PreviousTrackingServiceAttribute.cs

@@ -0,0 +1,33 @@
+// ---------------------------------------------------------------------------
+// Copyright (C) 2005 Microsoft Corporation All Rights Reserved
+// ---------------------------------------------------------------------------
+
+using System;
+
+namespace System.Workflow.Runtime.Tracking
+{
+    [AttributeUsage(AttributeTargets.Class, AllowMultiple = true)]
+    [Obsolete("The System.Workflow.* types are deprecated.  Instead, please use the new types from System.Activities.*")]
+    public sealed class PreviousTrackingServiceAttribute : Attribute
+    {
+        string assemblyQualifiedName;
+
+        public string AssemblyQualifiedName
+        {
+            get
+            {
+                return this.assemblyQualifiedName;
+            }
+        }
+
+        // The parameter must be the exact TypeOfPreviousTrackingService.AssemblyQualifiedTypeName.
+        public PreviousTrackingServiceAttribute(string assemblyQualifiedName)
+        {
+            if (string.IsNullOrEmpty(assemblyQualifiedName))
+                throw new ArgumentNullException(assemblyQualifiedName);
+
+            this.assemblyQualifiedName = assemblyQualifiedName;
+        }
+    }
+    
+}