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View delegateExample.cs
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void Main()
{
var x = new Thing();
Action<string> onFoo = s => Console.WriteLine (s);
x.OnFoo += onFoo.Invoke;
x.RaiseEvent("a");
x.RaiseEvent("b");
x.OnFoo -= onFoo.Invoke;
x.RaiseEvent("c");
}
 
delegate void Foo(string s);
class Thing {
public event Foo OnFoo;
public void RaiseEvent(string s) {
var handler = OnFoo;
if (handler != null) {
var subscribers = handler.GetInvocationList().Length;
Console.WriteLine ("subscribers: " + subscribers);
handler(s);
} else Console.WriteLine ("no subscribers");
}
}
 
/* OUTPUT:
subscribers: 1
a
subscribers: 1
b
no subscribers
*/
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