<SolidColorBrush x:Key="TextBox.Static.Border" Color="#FFABAdB3"/>

    <SolidColorBrush x:Key="TextBox.MouseOver.Border" Color="#FF7EB4EA"/>

    <SolidColorBrush x:Key="TextBox.Focus.Border" Color="#FF569DE5"/>

    <VisualBrush x:Key="HintText" TileMode="None" Opacity="0.5" Stretch="None" AlignmentX="Left">

        <VisualBrush.Visual>

            <TextBlock FontStyle="Italic" Text="请输入数据"/>

        </VisualBrush.Visual>

    </VisualBrush>

    <Style x:Key="TBoxLightWatermarkWithUnit" TargetType="{x:Type TextBox}">

        <Setter Property="Background" Value="{DynamicResource {x:Static SystemColors.WindowBrushKey}}"/>

        <Setter Property="BorderBrush" Value="{StaticResource TextBox.Static.Border}"/>

        <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}"/>

        <Setter Property="BorderThickness" Value="1"/>

        <Setter Property="KeyboardNavigation.TabNavigation" Value="None"/>

        <Setter Property="HorizontalContentAlignment" Value="Left"/>

        <Setter Property="FocusVisualStyle" Value="{x:Null}"/>

        <Setter Property="AllowDrop" Value="true"/>

        <Setter Property="ScrollViewer.PanningMode" Value="VerticalFirst"/>

        <Setter Property="Stylus.IsFlicksEnabled" Value="False"/>

        <Setter Property="Template">

            <Setter.Value>

                <ControlTemplate TargetType="{x:Type TextBox}">

                    <Border x:Name="border" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" SnapsToDevicePixels="True"

                                CornerRadius="2"

                                >

                        <Grid>

                            <Grid.ColumnDefinitions>

                                <ColumnDefinition Width="*"/>

                                <ColumnDefinition Width="35"/>

                            </Grid.ColumnDefinitions>

                            <ScrollViewer Grid.Column="0" x:Name="PART_ContentHost" Focusable="false" HorizontalScrollBarVisibility="Hidden" VerticalScrollBarVisibility="Hidden"/>

                            <TextBlock Grid.Column="1" Text="mm" VerticalAlignment="Center" Margin="0,0,5,0"/>

                        </Grid>

                    </Border>

                    <ControlTemplate.Triggers>

                        <Trigger Property="IsEnabled" Value="false">

                            <Setter Property="Opacity" TargetName="border" Value="0.56"/>

                        </Trigger>

                        <Trigger Property="IsMouseOver" Value="true">

                            <Setter Property="BorderBrush" TargetName="border" Value="{StaticResource TextBox.MouseOver.Border}"/>

                        </Trigger>

                        <Trigger Property="IsKeyboardFocused" Value="true">

                            <Setter Property="BorderBrush" TargetName="border" Value="{StaticResource TextBox.Focus.Border}"/>

                        </Trigger>

                    </ControlTemplate.Triggers>

                </ControlTemplate>

            </Setter.Value>

        </Setter>

        <Style.Triggers>

            <MultiTrigger>

                <MultiTrigger.Conditions>

                    <Condition Property="IsInactiveSelectionHighlightEnabled" Value="true"/>

                    <Condition Property="IsSelectionActive" Value="false"/>

                </MultiTrigger.Conditions>

                <Setter Property="SelectionBrush" Value="{DynamicResource {x:Static SystemColors.InactiveSelectionHighlightBrushKey}}"/>

            </MultiTrigger>

            <Trigger Property="Text" Value="{x:Null}">

                <Setter Property="Background" Value="{StaticResource HintText}"/>

            </Trigger>

            <Trigger Property="Text" Value="">

                <Setter Property="Background" Value="{StaticResource HintText}"/>

            </Trigger>

        </Style.Triggers>

    </Style>

    <TextBox

                            Name="txtHeight"

                            FontSize="16"

                            Width="274"

                            Height="40"

                            Margin="15,0,0,0"

                            Text="2840"

                            InputMethod.IsInputMethodEnabled="False"

                            PreviewTextInput="TxtHeight_PreviewTextInput"

                            KeyDown="TxtHeight_KeyDown"

                            HorizontalAlignment="Center"

                            VerticalAlignment="Center"

                            VerticalContentAlignment="Center"

                            Tag="请输入数字"

                            Style="{DynamicResource TBoxLightWatermarkWithUnit}"/>