用委托来实现子窗体操作父窗体中的控件

代码实现
Form1中，一个Lable1;在Form2中控制Form1中的Lable1的显示或隐藏!
Form1代码：

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1. namespace WindowsApplication2  
2. {  
3. public delegate void SetVisiableHandler();  
4. public partial class Form1 : Form  
5.     {  
6. public Form1()  
7.         {  
8.             InitializeComponent();  
9.         }  
11. private void button1_Click(object sender, EventArgs e)  
12.         {  
13.             Form2 frm = new Form2(new SetVisiableHandler(SetVisiable));  
14.             frm.Show();  
15.         }  
17. private void SetVisiable()  
18.         {  
19.             SetVisiable(this.label1, !this.label1.Visible);  
20.         }  
22. private void SetVisiable(Control control, bool visiable)  
23.         {  
24. if (this.Controls.Contains(control))  
25.             {  
26.                 control.Visible = visiable;  
27.             }  
28.         }  
29.     }  
30. } 

namespace WindowsApplication2 { public delegate void SetVisiableHandler(); public partial class Form1 : Form { public Form1() { InitializeComponent(); } private void button1_Click(object sender, EventArgs e) { Form2 frm = new Form2(new SetVisiableHandler(SetVisiable)); frm.Show(); } private void SetVisiable() { SetVisiable(this.label1, !this.label1.Visible); } private void SetVisiable(Control control, bool visiable) { if (this.Controls.Contains(control)) { control.Visible = visiable; } } } }

Form2代码

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1. namespace WindowsApplication2  
2. {  
3. public partial class Form2 : Form    {  
4. private SetVisiableHandler m_setVisible;  
5. public Form2(SetVisiableHandler setvisible)  
6.         {  
7.             InitializeComponent();  
8. this.m_setVisible = setvisible;  
9.         }  
11. private void btnVisible_Click(object sender, EventArgs e)  
12.         {  
13. if (this.m_setVisible != null)  
14.             {  
15. this.m_setVisible();  
16.             }  
17.         }  
18.     }  
19. }