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using System;
public delegate void EventHandler (int i, int j);
public class Button {
private EventHandler click;
public event EventHandler Click {
add { click += value; }
remove { click -= value; }
}
public void OnClick (int i, int j)
{
if (click == null) {
Console.WriteLine ("Nothing to click!");
return;
}
click (i, j);
}
public void Reset ()
{
click = null;
}
}
public class Blah {
Button Button1 = new Button ();
public void Connect ()
{
Button1.Click += new EventHandler (Button1_Click);
Button1.Click += new EventHandler (Foo_Click);
Button1.Click += null;
}
public void Button1_Click (int i, int j)
{
Console.WriteLine ("Button1 was clicked !");
Console.WriteLine ("Answer : " + (i+j));
}
public void Foo_Click (int i, int j)
{
Console.WriteLine ("Foo was clicked !");
Console.WriteLine ("Answer : " + (i+j));
}
public void Disconnect ()
{
Console.WriteLine ("Disconnecting Button1's handler ...");
Button1.Click -= new EventHandler (Button1_Click);
}
public static int Main ()
{
Blah b = new Blah ();
b.Connect ();
b.Button1.OnClick (2, 3);
b.Disconnect ();
Console.WriteLine ("Now calling OnClick again");
b.Button1.OnClick (3, 7);
Console.WriteLine ("Events test passes");
return 0;
}
}
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