c# 子窗口调用父窗口控件委托实现

父窗口

MainForm.cs:  
  
    public partial class MainForm : Form  
    {  
        public MainForm()  
        {  
            InitializeComponent();  
        }  
  
        private void button1_Click(object sender, EventArgs e)  
        {  
            SubForm SubForm = new SubForm();  
  
            // 3.将ChangeTextVal加入到委托事件中  
            // 等效于：   
            // SubForm.ChangeTextVal += ChangeTextVal;  
            SubForm.ChangeTextVal += new DelegateChangeTextVal(ChangeTextVal);  
            SubForm.ShowDialog();  
        }  
  
        public void ChangeTextVal(string TextVal)  
        {  
            this.textBox1.Text = TextVal;  
        }  
    }  

子窗口

SubForm.cs:  
  
    // 1.定义委托类型  
    public delegate void DelegateChangeTextVal(string TextVal);    
  
    public partial class SubForm : Form  
    {  
        // 2.定义委托事件  
        public event DelegateChangeTextVal ChangeTextVal;  
  
        public SubForm()  
        {  
            InitializeComponent();  
        }  
  
        private void button1_Click(object sender, EventArgs e)  
        {  
            ChangeMainFormText(this.textBox1.Text);  
        }  
  
        private void ChangeMainFormText(string TextVal)  
        {  
            // 4.调用委托事件函数  
            ChangeTextVal(TextVal);  
        }  
    }  

原文http://blog.csdn.net/irwin_chen/article/details/7430524