// 阻止从键盘输入键 e.Handled = true ; if (e.KeyChar >= ' 0 ' && e.KeyChar <= ' 9 ' || (e.KeyChar == ( char ) 8 )) if (e.KeyChar == ( char ) 8 ) e.Handled = false ; return ; int len_lookNum = ((TextEdit)sender).Text.Trim().Length; if (len_lookNum < 8 ) if (len_lookNum == 0 && e.KeyChar != ' 0 ' ) e.Handled = false ; return ; else if (len_lookNum== 0 ) e.Handled = true ; return ; e.Handled = false ; return ; MessageBox.Show( " 输入数字过大 " );