Generic class with self-referencing type constraint

Question

Consider the following code:

abstract class Foo
    where T : Foo, new()
{
    void Test()
    {
        if(Bar != null)
            Bar(th         


        

Answer 1

delegate void Bar(Foo foo) where T : Foo, new();

It works great. I tested it.

here is the test code

public abstract class Foo where T :Foo {
    public event Bar Bar;

    public void Test ()
    {
        if (Bar != null)
        {
            Bar (this);
        }
    }
}

public class FooWorld : Foo {
}

public delegate void Bar(Foo foo) where T : Foo;

class MainClass
{
    public static void Main (string[] args)
    {
        FooWorld fw = new FooWorld ();
        fw.Bar += delegate(Foo foo) {
            Console.WriteLine ("Bar response to {0}", foo);
        };

        fw.Test ();
    }
}