public void GetExtensionsReturnsExtensionsCollection() { const string BookmarkName = "Test"; var activity = new Sequence { Activities = { new ActivityExtensionTest { AddExtensionProvider = true }, new TestBookmark<int> { BookmarkName = BookmarkName }, new ActivityExtensionTest { AddExtensionProvider = true }, } }; var traceTrackingParticipant = new TraceTrackingParticipant(); var listTrackingParticipant = new ListTrackingParticipant(); var workflowApplication = new WorkflowApplication(activity); // Add a couple of singleton extensions workflowApplication.Extensions.Add(traceTrackingParticipant); workflowApplication.Extensions.Add(listTrackingParticipant); // foreach (var extension in workflowApplication.Extensions) // { // Doh! this won't work // foreach statement cannot operate on variables of type // 'System.Activities.Hosting.WorkflowInstanceExtensionManager' // because 'System.Activities.Hosting.WorkflowInstanceExtensionManager' // does not contain a public definition for 'GetEnumerator' // } // Run it so that the activity will create an extension workflowApplication.RunEpisode(BookmarkName, Constants.Timeout); // Resume and run to completion workflowApplication.ResumeEpisodeBookmark(BookmarkName, 1); // Now I can get the Singleton Extensions as a collection var extensions = workflowApplication.GetSingletonExtensions(); Assert.IsNotNull(extensions); Assert.AreEqual(2, extensions.Count); // Note: Extensions created by AddDefaultExtensionProvider will not appear in the collection Assert.IsTrue(extensions.Contains(traceTrackingParticipant)); Assert.IsTrue(extensions.Contains(listTrackingParticipant)); foreach (var extension in extensions) { Debug.WriteLine("Found singleton extension " + extension); } }