wpf设置字体颜色渐变和字体阴影

<StackPanel Orientation="Horizontal" Grid.Column="1" HorizontalAlignment="Left" VerticalAlignment="Center" >
            <StackPanel.Resources>
                <Style x:Key="textBlockStyle" TargetType="TextBlock">
                    <!--字体渐变-->
                    <Setter Property="Foreground">
                        <Setter.Value>
                            <LinearGradientBrush StartPoint="0.5,0" EndPoint="0.5,0.5">
                                <GradientStop Color="#FFFFE787" Offset="0.0" />
                                <!--<GradientStop Color="#FFFFE787" Offset="0.25" />-->
                                <GradientStop Color="White" Offset="0.5" />
                            </LinearGradientBrush>
                        </Setter.Value>
                    </Setter>
                    <!--字体阴影-->
                    <Setter Property="Effect">
                        <Setter.Value>
                            <DropShadowEffect Color="Black" Direction="120" ShadowDepth="1" Opacity="0.7" />
                        </Setter.Value>
                    </Setter>
                    <Setter Property="FontFamily" Value="Microsoft YaHei"/>
                    <Setter Property="FontWeight" Value="Bold"/>
                    <Setter Property="FontSize" Value="28"/>
                </Style>
            </StackPanel.Resources>
            <TextBlock x:Name="tbl_OrganName" Margin="10,0,0,0"  Text="" Style="{StaticResource textBlockStyle}" />
            <TextBlock x:Name="tbl_SysName"   Text="警情警力可视化监控系统" Style="{StaticResource textBlockStyle}" />
        </StackPanel>