Question

Suppose I’ve this generic method

void ActivateView<T>(ViewCommand command) where T : IPresenter
{
    //code
}

And I’ve an action as:

Action<ViewCommand> action = this.ActivateView<DiagnosticPresenter>;

Now given action, how can I know the type arument to the generic method ActivateView? In this case, it should be DiagnosticPresenter. So I’m expecting an instance of Type equal to typeof(DiagnosticPresenter) as:

Type type = Magic(action); //what should Magic do?
if ( type == typeof(DiagnosticPresenter))
{
    //I want to do something here!
}

Is that possible? How should I implementMagic()?

Answer 1

This appears to work for me:

public Type Magic(Action action)
{
    return action.Method.GetGenericArguments().First();
}