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>