C# 限制文本框只得输入数字

C# 限制文本框只能输入数字
如题

[解决办法]

C# code

 /// <summary>  /// 限制输入数字以外的字符  /// </summary>  /// <param name="sender"></param>  /// <param name="e"></param>  private void textbox_KeyPress(object sender, KeyPressEventArgs e)  {  if (((int)e.KeyChar < 48 || (int)e.KeyChar > 57) && e.KeyChar != 8)  {  e.Handled = true;  }  }
[解决办法]
   try
           {
             int num= int.Parse(txtnum.Text);
           }
           catch (Exception ex)
           {
               MessageBox.Show("非数字！");
           }