WPF 如何阻止 DropShadowEffect 传播到 child？

Question

我有一个无边界 Window，其中 Border 作为根节点，Canvas 作为 child。 canvas 用于通过 MouseMove 绘制折线。边框有一个 DropShadowEffect，这会导致绘制 Canvas 时的性能显着下降。我已经看到其他人 post 建议将边框和 Canvas 放在两个单独的网格中，但这对我的情况不起作用，因为如果我将边框放在网格中，我会失去阴影效果围绕 Window.

还有其他方法可以防止 Effect 传播吗？

这是 xaml 代码：

<Window x:Class="Test.MainWindow"
    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"
    xmlns:local="clr-namespace:Test"
    mc:Ignorable="d"
    Title="Test"
    Height="600" Width="1000"
    Background="{x:Null}"
    BorderThickness="0"
    BorderBrush="Black" 
    AllowsTransparency="True"
    WindowStyle="None">

<WindowChrome.WindowChrome>
    <WindowChrome
    CaptionHeight="0"
    ResizeBorderThickness="5,5,20,20"/>
</WindowChrome.WindowChrome>

<Border x:Name="borderShadow" Margin="0,0,15,15" BorderThickness="2,1" BorderBrush="Black" Background="#FF355870">
    <Border.Effect>
        <DropShadowEffect Color="Black"
                      Direction="315"
                      BlurRadius="15"
                      ShadowDepth="10"/>
    </Border.Effect>

    <Grid Background="#FF355870">
        <Canvas x:Name="canvasBoard" Background="#00000000" MouseMove="canvasBoard_MouseMove" MouseDown="canvasBoard_MouseDown" MouseUp="canvasBoard_MouseUp"/>
    </Grid>
</Border>
</Window>

Answer 1

您可以这样将边框单独放在网格中：

<Grid>
<Border x:Name="borderShadow" Margin="0,0,15,15" BorderThickness="2,1" BorderBrush="Black" Background="#FF355870">
    <Border.Effect>
        <DropShadowEffect Color="Black"
                      Direction="315"
                      BlurRadius="15"
                      ShadowDepth="10"/>
    </Border.Effect>
</Border>
<Grid Background="#FF355870">
    <Canvas x:Name="canvasBoard" Background="#00000000" MouseMove="canvasBoard_MouseMove" MouseDown="canvasBoard_MouseDown" MouseUp="canvasBoard_MouseUp"/>
</Grid>
</Grid>

WPF 如何阻止 DropShadowEffect 传播到 child？

WPF how to stop DropShadowEffect to propagate to child?

c#

wpf

dropshadoweffect