Question

C#委托和事件用法

写一程序,实现窗体传值 要求:有两个窗体,Form1里面有两个控件,button(弹出Form2),lable,Form2里面有也有两个控件textbox,button(点击后把textbox的值传给Form1的lable.text) 用委托和事件实现

Answer 1

class Form2ButtonClickedEventArgs : EventArgs { string _text; public Form2ButtonClickedEventArgs(string text) { _text = text; } public string Text { get { return _text; } } } delegate void Form2ButtonClickedEventHandler(object sender, Form2ButtonClickedEventArgs e); class Form2 : Form { public event Form2ButtonClickedEventHandler Form2ButtonClicked; private void button_Clicked(object sender, EventArgs e) { if(Form2ButtonClicked != null) { Form2ButtonClicked(this, new Form2ButtonClickedEventArgs(this.textbox.Text)); } } } class Form1 : Form { private void button_Clicked(object sender, EventArgs e) { Form2 form = new Form2(); form.Form2ButtonClicked += new Form2ButtonClickedEventHandler(form2_Form2ButtonClicked); form.ShowDialog(this); } private void form2_Form2ButtonClicked(object sender, Form2ButtonClickedEventArgs e) { this.label.Text=e.Text; } }

Answer 2

在form1中写个传值的public 方法，然后再form2中调用就可以了