What's the reason for the use of delegates in WF4?

Question

Why does WF4 use this pattern (callbacks via delegates)?

app.Idle = delegate(WorkflowApplicationIdleEventArgs o)
{    
    syncEvent.Set();
};

Answer 1

This is an anonymous method .

It's easier than writing a separate method, and it allows you to access the syncEvent local variable without writing a separate class with a field (see my blog for more information).