Error Handling Wf4
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in WF4 Error handling in a NativeActivity By Maurice de Beijer Note: This blog post is written using the .NET framework 4.0 RC 1 Using Workflow Foundation 4 the http://blogs.msmvps.com/theproblemsolver/2010/02/09/error-handling-in-a-nativeactivity/ NativeActivity is the powerhouse when it comes to building native activities. One of its many capabilities is around error handling. Every so often I run into one of these things where things don’t quite work the way I expect them to and this is one of these cases. The basics of error handling when scheduling child activities. Whenever a NativeActivity is executed it is passed an error handling instance of the NativeActivityContext which it can use to schedule other activities using the ScheduleActivity() function. This ScheduleActivity() function has a few overloads, one of them using an FaultCallback. This FaultCallback is called when some kind of exception occurs while executing the child activity being scheduled. The fault handling function is called with a couple of parameters including a NativeActivityFaultContext and the exception that is unhandled. The NativeActivityFaultContext error handling wf4 contains a HandleFault() function used to indicate that the fault was handled. Not quite as straightforward as a try/catch block but given the asynchronous nature of workflow that would not work. So I expected the following activity to catch any exceptions and continue. public sealed class MyActivity : NativeActivity { public Activity Body { get; set; } protected override void Execute(NativeActivityContext context) { context.ScheduleActivity(Body, FaultHandler); } private void FaultHandler(NativeActivityFaultContext faultContext, Exception propagatedException, ActivityInstance propagatedFrom) { Console.WriteLine(propagatedException.Message); faultContext.HandleFault(); } } Do not use, this code has a serious error! Lets test this code by executing the following workflow: private static Activity CreateWorkflow() { return new Sequence { Activities = { new WriteLine { Text = "Start outer sequence." }, new MyActivity { Body = new Sequence { Activities = { new WriteLine { Text = "Start inner sequence." }, new Throw { Exception = new InArgument