Question

I would like to pass a reference of a method into another method and store it as a variable. Later, I would like to use this reference to define an event handler.

When making an event handler, a method reference is passed like:

myButton.Click += new RoutedEventHandler(myButton_Click); 

And if you look at the constructor for ‘RoutedEventHandler’ from intelliSense, it looks like:

RoutedEventHandler(void(object, RoutedEventArgs)) 

What I would like to do is pass the method ‘myButton_Click’ to a different static method and then create an event handler there. How do I pass the reference to the static method? I tried the following but it doesn’t compile:

public class EventBuilder {     private static void(object, RoutedEventArgs) _buttonClickHandler;      public static void EventBuilder(void(object, RoutedEventArgs) buttonClickHandler)     {         _buttonClickHandler = buttonClickHandler;     }      public static void EnableClickEvent()     {         myButton.Click += new RoutedEventHandler(_buttonClickHandler);     } } 

Thanks, Ben

Answer 1

To reference a Method Reference (called a delegate in .NET), use the Handler name, rather than the signature.

public class EventBuilder {     private static RoutedEventHandler _buttonClickHandler;      public EventBuilder(RoutedEventHandler buttonClickHandler)     {         _buttonClickHandler = buttonClickHandler;     }      public static void EnableClickEvent()     {         myButton.Click += new RoutedEventHandler(_buttonClickHandler);     } }