我对WPF技术还不熟悉。我在WPF中有以下窗口声明:
<Window x:Class="CustomWindows.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="480" Width="640" ScrollViewer.VerticalScrollBarVisibility="Disabled" WindowStyle="None" AllowsTransparency="True">
<Window.Effect>
<DropShadowEffect BlurRadius="15" Direction="-90" RenderingBias="Quality" ShadowDepth="2"/>
</Window.Effect>
<Grid>
</Grid>
</Window>
但是当我运行它时,阴影并没有出现。我该怎么办,或者哪里出了错误?