tests/test-57.cs

   1 using System;
   2
   3 public delegate void EventHandler (int i, int j);
   4
   5 public class Button {
   6
   7         private EventHandler click;
   8
   9         public event EventHandler Click {
  10                 add    { click += value; }
  11                 remove { click -= value; }
  12         }
  13
  14         public void OnClick (int i, int j)
  15         {
  16                 if (click == null) {
  17                         Console.WriteLine ("Nothing to click!");
  18                         return;
  19                 }
  20
  21                 click (i, j);
  22         }
  23
  24         public void Reset ()
  25         {
  26                 click = null;
  27         }
  28 }
  29
  30 public class Blah {
  31
  32         Button Button1 = new Button ();
  33
  34         public void Connect ()
  35         {
  36                 Button1.Click += new EventHandler (Button1_Click);
  37                 Button1.Click += new EventHandler (Foo_Click);
  38                 Button1.Click += null;
  39         }
  40
  41         public void Button1_Click (int i, int j)
  42         {
  43                 Console.WriteLine ("Button1 was clicked !");
  44                 Console.WriteLine ("Answer : " + (i+j));
  45         }
  46
  47         public void Foo_Click (int i, int j)
  48         {
  49                 Console.WriteLine ("Foo was clicked !");
  50                 Console.WriteLine ("Answer : " + (i+j));
  51         }
  52
  53         public void Disconnect ()
  54         {
  55                 Console.WriteLine ("Disconnecting Button1's handler ...");
  56                 Button1.Click -= new EventHandler (Button1_Click);
  57         }
  58
  59         public static int Main ()
  60         {
  61                 Blah b = new Blah ();
  62
  63                 b.Connect ();
  64
  65                 b.Button1.OnClick (2, 3);
  66
  67                 b.Disconnect ();
  68
  69                 Console.WriteLine ("Now calling OnClick again");
  70                 b.Button1.OnClick (3, 7);
  71
  72                 Console.WriteLine ("Events test passes");
  73                 return 0;
  74         }
  75
  76 }