Silverlight限制TextBox只能输入数字与小数的几种方法

private void txtRoomNum_KeyDown(object sender, KeyEventArgs e)
{
    TextBox txt = sender as TextBox;
    //屏蔽非法按键，只能输入整数
    if ((e.Key >= Key.NumPad0 && e.Key <= Key.NumPad9))
    {
        e.Handled = false;
    }
    else
    {
        e.Handled = true;
    }
}

private void txtRoomArea_KeyDown(object sender, KeyEventArgs e)
{
    TextBox txt = sender as TextBox;
    //屏蔽非法按键，只能输入小数
    if ((e.Key >= Key.NumPad0 && e.Key <= Key.NumPad9) || e.Key == Key.Decimal)
    {
        if (txt.Text.Contains(".") && e.Key == Key.Decimal)
        {
            e.Handled = true;
            return;
        }
        e.Handled = false;
    }
    else
    {
        e.Handled = true;
    }

}参考一：
以下实现TextBox只能输入小数并且屏蔽中文输入和非法粘贴:
说明:以下实现均在Framework 3.0平台下
为TextBox加两个事件:TextChanged和KeyDown事件,具体如下:
KeyDown事件:
Code [http://www.xueit.com] 1private void TextBox_KeyDown(object sender, System.Windows.Input.KeyEventArgs e)
2        {
3            TextBox txt = sender as TextBox;
4
5             //屏蔽非法按键
6            if ((e.Key >= Key.NumPad0 && e.Key <= Key.NumPad9) || e.Key == Key.Decimal)
7            {
8                if (txt.Text.Contains(".") && e.Key == Key.Decimal)
9                {
10                    e.Handled = true;
11                    return;
12                }
13                e.Handled = false;
14            }
15            else if (((e.Key >= Key.D0 && e.Key <= Key.D9) || e.Key == Key.OemPeriod) && e.KeyboardDevice.Modifiers != ModifierKeys.Shift)
16            {
17                if (txt.Text.Contains(".") && e.Key == Key.OemPeriod)
18                {
19                    e.Handled = true;
20                    return;
21                }
22                e.Handled = false;
23            }
24            else
25            {
26                e.Handled = true;
27            }
28        }