Form2
namespace WindowsFormsApp1 { //定义委托 public delegate void Sum(int x, int y); public partial class Form2 : Form { //定义事件 public event Sum sum; public Form2() { InitializeComponent(); } private void button1_Click(object sender, EventArgs e) { int x = Convert.ToInt32(textBox1.Text); int y = Convert.ToInt32(textBox2.Text); sum(x, y); } } }
Form1
namespace WindowsFormsApp1 { public partial class Form1 : Form { public Form1() { InitializeComponent(); } private void button1_Click(object sender, EventArgs e) { Form2 form2 = new Form2(); //注册事件 form2.sum += sum; form2.ShowDialog(); } //计算 public void sum(int x ,int y) { textBox1.Text = (x + y).ToString(); } } }
effect