How to handle exceptions occured in the delegate target.

Question

Hi,

I have a delegate which points to 3 different methods. These methods are added in its invocation list.

What is second method throws an exception??? I still need to execute the third method.

I think one alternative is below mentioned code

         public delegate void MethodHandler();
            A oa = new A();
            B ob = new B();
            C oc = new C();
            D od = new D();


            MethodHandler M = oa.TestM;
            M += ob.TestM;
            M += oc.TestM;
            M += od.TestM;

            foreach (Delegate item in M.GetInvocationList())
            {
                try
                {
                    item.DynamicInvoke(null);
                }
                catch
                {
                }

            }

Is there any other alternative to avoid this?

Answer 1

You're not going to be able to "avoid" this in the sense of not using a try/catch pattern to ensure your code proceeds past a delegate that threw an exception.

Nothing's stopping you from writing your own class to wrap this functionality, though -- to mitigate the potential proliferation of this exact code everywhere you're using your M delegate.

By the way, I believe you can change this line:

item.DynamicInvoke(null);

to this (to avoid the DynamicInvoke):

MethodHandler handler = (MethodHandler)item;
handler.Invoke();