C#屏蔽Alt+F4

1.将窗体的属性KeyPrieview设置为true
2.在窗体KeyDown事件中加如下代码
private void FormVali_KeyDown(object sender, System.Windows.Forms.KeyEventArgs e)
{
//屏掉alt+f4
if ((e.KeyCode == Keys.F4)&&(e.Alt == true))
{
e.Handled = true;
}

}