textbox只允许输入数字

C# 文本框只能输入数字和退格键

private void TextBox_KeyPress(object sender, KeyPressEventArgs e)
  {
       if(e.KeyChar!=8&&!Char.IsDigit(e.KeyChar))
     {
        e.Handled = true;
      }
  }

或者

private void TextBox_KeyPress(object sender, KeyPressEventArgs e)
  {
     if(e.KeyChar!='\b'&&!Char.IsDigit(e.KeyChar))
     {
         e.Handled = true;
     }
  }