WPF设置文本框只能输入数字

//前台UI设置

  <TextBox Width="100" Height="30" PreviewTextInput="TextBox_PreviewTextInput"  PreviewKeyDown="TextBox_PreviewKeyDown" InputMethod.IsInputMethodEnabled="False"/>

InputMethod.IsInputMethodEnabled="False"禁用输入法

后台代码限定只能输入数字

private void TextBox_PreviewTextInput(object sender, TextCompositionEventArgs e)
{
	 short val;
	 if (!Int16.TryParse(e.Text, out val))
	      e.Handled = true;
	 if(e.KeyChar ==(char)('.')&&((TextBox)sender).Text.IndexOf('.')!=-1) //小数点只能输一次
	 {
		e.Handled = true;
	 }
	 //第一位不能为小数点 
	if (e.KeyChar == (char)('.') && ((TextBox)sender).Text == "") 
	{ 
		e.Handled = true; 
	} 
	//第一位是0，第二位必须为小数点 
	if (e.KeyChar != (char)('.') && ((TextBox)sender).Text == "0") 
	{ 
		e.Handled = true; 
	} 
}

private void TextBox_PreviewKeyDown(object sender, KeyEventArgs e)
{
    if (e.Key == Key.Space)
        e.Handled = true;
}