限制字符的按鍵例外

Question

如何讓空格鍵僅用於僅限數字的文本框？

private void CLimitTxt_KeyPress(object sender, KeyPressEventArgs e) 
    { 
     if (!char.IsNumber(e.KeyChar)) 
     { 
      MessageBox.Show("You can only enter numbers within this textbox", "Error"); 
      CLimitTxt.Text = ""; 
      e.Handled = true; 
     } 
    } 

我是否需要聲明一個變種正則表達式有一個例外吧？

Answer 1

就這麼簡單：

private void CLimitTxt_KeyPress(object sender, KeyPressEventArgs e) 
{ 
    if (!char.IsNumber(e.KeyChar) && !e.KeyChar == ' ') 
    { 
     MessageBox.Show("You can only enter numbers within this textbox", "Error"); 
     CLimitTxt.Text = ""; 
     e.Handled = true; 
    } 
}