Excpetion Handling with a NativeAcitivity - workflow-foundation-4

Question

I'm using a NativeActivity with a child activity called Body and a ActivityAction called OnFault, this is my code:
[Designer(typeof(RetryDesigner))]
public sealed class Retry : NativeActivity {
public Activity Body { get; set; }
public ActivityAction<Exception> OnFault { get; set; }
protected override void CacheMetadata(NativeActivityMetadata metadata) {
metadata.AddChild(Body);
metadata.AddDelegate(OnFault);
base.CacheMetadata(metadata);
}
protected override void Execute(NativeActivityContext context) {
context.ScheduleActivity(Body, OnBodyCompleted, OnBodyFaulted);
}
void OnFaultCompleted(NativeActivityContext context, ActivityInstance instance) {
context.ScheduleActivity(Body);
}
void OnBodyCompleted(NativeActivityContext context, ActivityInstance instance) {
}
void OnBodyFaulted(NativeActivityFaultContext faultContext, Exception propagatedException, ActivityInstance propagatedFrom) {
faultContext.HandleFault();
if (OnFault != null) {
faultContext.ScheduleAction<Exception>(OnFault, propagatedException, OnFaultCompleted);
}
}
}
and my main looks like this:
static void Main(string[] args) {
Variable<Exception> ex = new Variable<Exception>();
DelegateInArgument<Exception> exception = new DelegateInArgument<Exception>();
Retry retry = new Retry {
Body = new Sequence {
Variables = { ex },
Activities = {
new Assign<Exception> {
To = new OutArgument<Exception>(ex),
Value = new InArgument<Exception>((env) => new Exception("test"))
},
new Throw {
Exception = ex
}
}
},
OnFault = new ActivityAction<Exception> {
Argument = exception,
Handler = new Sequence {
Activities = {
new WriteLine{
Text = new InArgument<string>(env =>
exception.Get(env).Message)
}
}
}
}
};
var workflow = new WorkflowInvoker(retry);
workflow.Invoke();
Console.WriteLine();
}
The problem is that the exception don't stop in the OnBodyFaulted callback and appear on the main as an unhedled expetion.
How can I stop the Exception inside the OnBodyFault callback, is there any state or property on the workflow to do that?

Answer 1

The problem is that in the OnFaultCompleted() you are calling context.ScheduleActivity(Body) again. This time without a fault handler so that causes the same fault to occur again and the complete workflow to fault.