Executing multicast delegates

Question

I have a Multiple target

Func<int,int,int> funHandler=Max;
funHandler+=square;

When i execute Console.WriteLine(funHandler(10,10)); it return the square of 10 (ie) 200.It did not fire Max .

i used something like

foreach(var v in funHandler.GetInvocationList())
{
    Console.WriteLine(v(10,20));
}

'V' is a variable,but it is used like a method.How can i fire all methods that is in delegate's invocation list?

Answer 1

Well, may be Max has no side effects and you can't notice it? When you execute multicast delegate it returns result of only last delegate.

Try this:

Func<int, int, int> funHandler = (x, y) => { Console.WriteLine(x); return x; };
funHandler += (x, y) => { Console.WriteLine(y); return y; };
int res = funHandler(1, 2);
Console.WriteLine(res);

See? it works

To use invocation list do this:

foreach (var v in funHandler.GetInvocationList())
{
    ((Func<int, int, int>)v)(1, 2);
}

Or:

foreach (Func<int, int, int> v in funHandler.GetInvocationList())
{
    v(1, 2);
}

Answer 2

Multicast with a delegate that returns something doesn't make much sense to me. I'd guess it executes all of them but discards all results but one.