Form2：

复制代码 代码如下:

//定义一个需要string类型参数的委托

publicdelegate void MyDelegate(string text);

public partial class Form2 :Form1

{

//定义该委托的事件

public event MyDelegate MyEvent;

public Form2(string text)

{

InitializeComponent();

this.textBox1.Text = text;

}

private void btnChange_Click(object sender, EventArgs e)

{

//触发事件，并将修改后的文本回传

MyEvent(this.textBox1.Text);

this.Close();

}

}

Form1:

复制代码 代码如下:

public partial class Form1 :Form

{

public int index = 0;

public string text = null;

public Form1()

{

InitializeComponent();

}

private void listBox1_SelectedIndexChanged(object sender, EventArgse)

{

if (this.listBox1.SelectedItem != null)

{

text = this.listBox1.SelectedItem.ToString();

index = this.listBox1.SelectedIndex;

Form2 form2 = new Form2(text);

//注册form2_MyEvent方法的MyEvent事件

form2.MyEvent += new MyDelegate(form2_MyEvent);

form2.Show();

}

}

//处理

void form2_MyEvent(string text)

{

this.listBox1.Items.RemoveAt(index);

this.listBox1.Items.Insert(index, text);

}

}