最简单C#EVENT事件

Form1.cs

 

public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}

private void button1_Click(object sender, EventArgs e)
{
Form2 form2 = new Form2();
form2.test += (Y) =>
{
MessageBox.Show(Y);
};
form2.Show();
}

}

 

 

Form2.cs

public partial class Form2 : Form
{
public Form2()
{
InitializeComponent();
}

// 创建一个委托，返回类型为void，两个参数
// conveyValve 传值 可为基本类型，也可以为类Class等
public delegate void MyHandler(string conveyValve);
// 将创建的委托和特定事件关联
public event MyHandler test;
private void buttonOk_Click(object sender, EventArgs e)
{
test?.Invoke("https://www.cnblogs.com/abcdefghij/");
}
}