Question

There are two descriptions of the delegate:
first, in a third-party assembly:

public delegate void ClickMenuItem (object sender, EventArgs e)

second, the standard:

public delegate void EventHandler (object sender, EventArgs e);

I’m trying to write a method that will receive a parameter of type EventHandler and will call third-party library, with the parameter ClickMenuItem.

How to convert the ClickMenuItem to EventHandler?

Answer 1

Fortunately, it’s simple. You can just write:

ClickMenuItem clickMenuItem = ...; // Wherever you get this from
EventHandler handler = new EventHandler(clickMenuItem);

And in reverse:

EventHandler handler = ...;
ClickMenuItem clickMenuItem = new ClickMenuItem(handler);

This will even work in C# 1.0. Note that if you then change the value of the original variable, that change won’t be reflected in the “converted” one. For example:

ClickMenuItem click = new ClickMenuItem(SomeMethod);
EventHandler handler = new EventHandler(click);
click = null;

handler(this, EventArgs.Empty); // This will still call SomeMethod