禁用Alt + F4,但允许通过代码关闭表单,CloseReason.UserClosing没有帮助

Question

我希望表单不会通过执行Alt+ 关闭,F4但如果Application.Exit()或this.Close从同一表单调用,则应该关闭它.

我试过CloseReason.UserClosing但仍然没有帮助.

Answer 1

如果你只需要过滤Alt+ F4事件(点击关闭框,this.Close()并Application.Exit()像往常一样),那么我可以建议如下:

1. 将表格的KeyPreview 属性设置为true;

2. 结束表格FormClosing和KeyDown事件:

   private void Form1_FormClosing(object sender, FormClosingEventArgs e)
   {
       if (_altF4Pressed)
       {
           if (e.CloseReason == CloseReason.UserClosing)
               e.Cancel = true;
           _altF4Pressed = false;
       }
   }
   
   private bool _altF4Pressed;
   private void Form1_KeyDown(object sender, KeyEventArgs e)
   {
       if (e.Alt && e.KeyCode == Keys.F4)
           _altF4Pressed = true;
   }