mcs/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         }
  39
  40         public void Button1_Click (int i, int j)
  41         {
  42                 Console.WriteLine ("Button1 was clicked !");
  43                 Console.WriteLine ("Answer : " + (i+j));
  44         }
  45
  46         public void Foo_Click (int i, int j)
  47         {
  48                 Console.WriteLine ("Foo was clicked !");
  49                 Console.WriteLine ("Answer : " + (i+j));
  50         }
  51
  52         public void Disconnect ()
  53         {
  54                 Console.WriteLine ("Disconnecting Button1's handler ...");
  55                 Button1.Click -= new EventHandler (Button1_Click);
  56         }
  57
  58         public static int Main ()
  59         {
  60                 Blah b = new Blah ();
  61
  62                 b.Connect ();
  63
  64                 b.Button1.OnClick (2, 3);
  65
  66                 b.Disconnect ();
  67
  68                 Console.WriteLine ("Now calling OnClick again");
  69                 b.Button1.OnClick (3, 7);
  70
  71                 Console.WriteLine ("Events test passes");
  72                 return 0;
  73         }
  74
  75 }