For c # events,

For c # events,

Original link http://blog.csdn.net/joyhen/article/details/8500211

 

I recently looked at the delegate and then saw the event, which had been vague in the past. The association between the event trigger and the responder. Paste a simple example:

1. Create a class Control. cs

 

1. Using System;
3. Namespace EventComplex
4. {
5. /*
6. * Event processing in C # is actually a delegate with a special signature.
7. */
8. Public class Control
9. {
10. /// <Summary>
11. /// Represents the event sender
12. /// </Summary>
13. /// <Param name = "sender"> event sender </param>
14. /// <Param name = "e"> event parameter class
15. /// <Remarks> is used to contain event-related data. All event parameter classes must be derived from the System. EventArgs class. </remarks>
16. /// </Param>
17. Public delegate void MyEventHandler (object sender, MyEventArgs e); // System. EventArgs e
18. Public event MyEventHandler MyEvent;
20. Public Control ()
21. {
22. This. MyEvent + = new MyEventHandler (RaiseSomeEvent );
23. }
25. /// <Summary>
26. /// An event
27. /// </Summary>
28. Public void RaiseSomeEvent (object sender, MyEventArgs e)
29. {
30. Console. WriteLine ("hello" + e. ParamName );
31. Console. ReadLine ();
32. }
34. Public void RiseSomeEvent ()
35. {
36. // System. EventArgs e = new System. EventArgs ();
37. Console. Write ("Please input 'name ':");
38. String _ param = Console. ReadLine (); // ReadLine: Press enter to read the data and then trigger the MyEvent event.
40. // If (_ param. Equals ("jon") // triggers the event when the user inputs jon. Otherwise, the event is not triggered.
41. MyEvent (this, new MyEventArgs (_ param); // MyEvent (this, e)
42. }
43. }
45. Public class MyEventArgs: System. EventArgs
46. {
47. Public string ParamName;
48. Public MyEventArgs (string _ name)
49. {
50. ParamName = _ name;
51. }
52. }
53. }

2. Let's test it in the Main function;

 

 

1. Public static void demo4 ()
2. {
3. Control ctr = new Control ();
4. Ctr. MyEvent + = new Control. MyEventHandler (ResponseSomeEvent );
5. Ctr. RiseSomeEvent ();
6. }
7. Public static void ResponseSomeEvent (object sender, EventArgs e)
8. {
9. Console. WriteLine ("Some event occur! ");
10. }

 

1. Static void Main (string [] args)
2. {
3. Demo4 ();
4. }