#1,022 – How to Use Return Values from All Delegate Instances
January 30, 2014 Leave a comment
If a delegate instance has an invocation list with multiple methods and you invoke the delegate using the standard functional notation, you’ll get back the return value only for the last method in the invocation list.
If you want to consume the return value for each method in a delegate’s invocation list, you can useĀ GetInvocationList to explicitly iterate through the invocation list.
ReturnIntDelegate del1 = Method1; // Returns 12 del1 += Method2; // Returns 99 // Invoke all at once, get return value // only from last Console.WriteLine("Invoke normally"); int val = del1(); Console.WriteLine(val); // Invoke one at a time Console.WriteLine("Invoke one at a time"); foreach (ReturnIntDelegate del in del1.GetInvocationList()) { int ret = del.Invoke(); Console.WriteLine(ret); }