Invoking WPF Dispatcher with anonymous method?

Look at the signature for Dispatcher.Invoke() . It doesn't take Action or some other specific delegate type. It takes Delegate which is the common ancestor of all delegate types.

But you can't convert anonymous method to this base type directly, you can convert it only to some specific delegate type. (The same applies to lambdas and method groups.).

The 'Delegate' class is abstract so you have to provide the compiler with a type that is derived from it. Any class derived from Delegate will do but Action is usually the most appropriate one.

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