C#中利用委托传递事件

public partial class MainFrm: Form

{

private void MainFrm _Load(object sender, EventArgs e)

{

Middle.sendEvent += new Middle.SendMessage(this.DoMethod);

}

public void DoMethod(string getstr)

{

listBox1.Items.Add(getstr);

}

}

ChildFrm.cs:

public partial class ChildFrm: Form

{

public ChildFrm ()

{

InitializeComponent();

}

private void button1_Click(object sender, EventArgs e)

{

Middle.DoSendMessage(this.textBox1.Text);

textBox1.Text = "";

textBox1.Focus();

}

}

Middle.cs：

public static class Middle

{

public delegate void SendMessage(string str);

public static event SendMessage sendEvent;

public static void DoSendMessage(string str)

{

sendEvent(str);

}

}