#1,019 – Syntax for Adding Methods to a Delegate’s Invocation List

If you have a delegate instance, it will have zero or more methods in its invocation list.  When you invoke the delegate instance, these are the methods that will be called.

For a given delegate instance, you can add or remove methods to its invocation list.  In actuality, since a delegate is immutable, you’re actually creating a new delegate instance that has the specified methods added or removed.

Below are several examples of how you might add a new method to the invocation list of an existing delegate instance.

            // Add Method2 to original invocation list
            StringHandlerDelegate del1 = Method1;
            del1 += Method2;
            del1("Howdy 1");

            // Does the same thing
            del1 = Method1;
            del1 = del1 + Method2;
            del1("Howdy 2");

            // Does the same thing
            del1 = Method1;
            del1 = (StringHandlerDelegate)Delegate.Combine(del1, new StringHandlerDelegate(Method2));
            del1("Howdy 3");

1019-001

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About Sean
Software developer in the Twin Cities area, passionate about .NET technologies. Equally passionate about my own personal projects related to family history and preservation of family stories and photos.

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