ElementHost DropShadowEffect

Question

我正在使用ElementHost在WinForms控件中承载一个WPF用户控件。我的WPF控件有DropShadowEffect，但它没有显示在屏幕上。WPF控件是平面控件。我该怎么办？下面是我的代码：

public WinFormsUserControl3()
{
            InitializeComponent();
            elementHost1 = new ElementHost() { Child = new MyWPFUserControl(), AutoSize=true};
            Controls.Add(elementHost1);
}

MyWPFUserControl xaml：

<UserControl x:Class="WindowsFormsApplication1.MyWPFUserControl"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="clr-namespace:WindowsFormsApplication1"
    Height="113" Width="107" Padding="10" Background="Red"  >
    <UserControl.Effect>
        <DropShadowEffect></DropShadowEffect>
    </UserControl.Effect>
    <StackPanel Background="Yellow">
        <Button Content="Button 1" Padding="5" Margin="5" />
        <Button x:Name="Button2" Padding="5" Margin="5" Content="Button 2" />
    </StackPanel>
</UserControl>

Answer 1

这是DropShadowEffect的示例XAML代码。

<UserControl x:Class='SilverlightApplication3.MainPage'
    xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation' 
    xmlns:x='http://schemas.microsoft.com/winfx/2006/xaml'
    xmlns:d='http://schemas.microsoft.com/expression/blend/2008' 
    xmlns:mc='http://schemas.openxmlformats.org/markup-compatibility/2006' 
    mc:Ignorable='d' 
    d:DesignWidth='640' 
    d:DesignHeight='480'>
    <Canvas Height="Auto" Width="Auto" Background="White">
        <TextBlock Height="49" Width="814" Canvas.Left="22" Canvas.Top="18" 
                   Text="this is a test" TextWrapping="Wrap" 
                   d:LayoutOverrides="Height" FontSize="30" FontFamily="Arial">
      <TextBlock.Effect>
        <DropShadowEffect/>
      </TextBlock.Effect>
        </TextBlock>
    </Canvas>
</UserControl>