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