C#,WinForm文本框录入内容判断

1  //45=-|46=.|
2 if ((e.KeyChar < 48 || e.KeyChar > 57) && (e.KeyChar != 8) && (e.KeyChar != 46) && (e.KeyChar != 127) && (e.KeyChar != 45))
3 {
4           e.Handled = true;
5 }