There's nothing built-in that I'm aware of.
You could just define the delegate once as a helper singleton:
var anObject = new Foo(NoOpAction.Instance);
// ...
var anotherObject = new Bar(NoOpAction.Instance);
// ...
public static class NoOpAction
{
private static readonly Action _instance = () => {};
public static Action Instance
{
get { return _instance; }
}
}
And because you're handed exactly the same delegate every time you use NoOpAction.Instance
throughout your program, you're also saving on the (admittedly small) cost of creating and garbage-collecting multiple delegates that all do the same thing.