C# case of closing child window and closing parent window

The following editor will bring you a simple example in C# of closing the child window and closing the parent window. The editor thinks it is quite good, so I will share it with you now and give it as a reference for everyone. Let's follow the editor and take a look.

In fact, it is a problem of communication between windows. Open form2 on form1, and close form1 when form2 is closed

Implementation method:

Declare event in the child window form2:

public delegate void childclose();
  public event childclose closefather;

  然后在它的关闭事件中触发本事件：

   private void Form2_Closed(object sender, System.EventArgs e)
   {
    //用事件去关闭主窗口
    closefather();
   }

In the parent window form1 (such as the login window):

Then Where the sub-form2 form pops up, write this:

  Form2 ff=new Form2();
  ff.closefather+=new childclose(this.closethis); //closethis()是父窗体中的一个方法
  ff.Show();

   public void closethis()
   {
     this.Close();
   }

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