判断关闭程序是否是点击X关闭的

  protected override void WndProc(ref Message msg)                                                    //判断程序的退出时点击的X还是操作影响
        {
            const int WM_SYSCOMMAND = 0x0112;
            const int SC_CLOSE = 0xF060;
            if (msg.Msg == WM_SYSCOMMAND && ((int)msg.WParam == SC_CLOSE))
            {
                // 点击winform右上关闭按钮
                // 加入想要的逻辑处理
                DialogResult dr = MessageBox.Show("确认关闭程序", "提示", MessageBoxButtons.YesNo);
                if (dr.Equals(DialogResult.Yes))
                {
                    Application.Exit();
                }
            }
            base.WndProc(ref msg);
        }

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