WPF和Expression Blend开发实例:一个样式实现的数字输入框

<Style x:Key="NumberTextBox" TargetType="{x:Type FrameworkElement}">
            <EventSetter Event="PreviewTextInput" Handler="TextBox_TextInput"/>
            <Setter Value="False" Property="InputMethod.IsInputMethodEnabled"/>
        </Style>
        <x:Code>
            <![CDATA[
                private void TextBox_TextInput(object sender, TextCompositionEventArgs e)
                {
                    bool flag = true;
                    foreach (char c in e.Text)
                    {
                        if (c < ‘0‘ || c > ‘9‘)
                        {
                            flag = false;
                        }
                    }
                    e.Handled = !flag;
                }
            ]]>
        </x:Code>

<TextBox Height="20" Width="200" Margin="10,0" Style="{StaticResource NumberTextBox}"/>