C#中自定義事件的注意事項

一個類中定義如下事件：

1. public delegate void AfterDrawPointEvent(object sender,double x,double y);

1. private AfterDrawPointEvent pAfterDrawPointEvent;
2. /// <summary>
3. /// 插入要素事件
4. /// </summary>
5. public event AfterDrawPointEvent AfterDrawpoint
6. {
7. add
8. {
9. pAfterDrawPointEvent += value;
10. }
11. remove
12. {
13. pAfterDrawPointEvent -= value;
14. }
15. }
16. private void RaiseAfterDrawPointEvent(object sender, double x,double y)
17. {
18. if (pAfterDrawPointEvent != null)
19. {
20. pAfterDrawPointEvent(sender,x,y);
21. }
23. }

1. m_pDrawCustomPoint.AfterDrawpoint-= new DrawCustomPoint.AfterDrawPointEvent(m_pDrawCustomPoint_AfterDrawpoint);
2. m_pDrawCustomPoint.AfterDrawpoint += new DrawCustomPoint.AfterDrawPointEvent(m_pDrawCustomPoint_AfterDrawpoint);