.NET Framework supported empty action syntax or singleton

Question

When working with existing frameworks, sometimes you need to pass in an action delegate which performs no action usually an extension point added by the original developer. Exam

Answer 1

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.