wpf窗口透明

方式一

WindowStyle="None" BorderThickness="0"
        ResizeMode="NoResize"

方式二

1. WindowStyle="None"
2. ResizeMode="CanMinimize" 或 ResizeMode="NoResize"
3. 调整WindowChrome

原理
WindowChrome

 <Window  
            xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
            xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
            WindowStyle="None" ResizeMode="CanMinimize"
            Title="walterlv demo" Height="450" Width="800">
<WindowChrome.WindowChrome>
        <WindowChrome GlassFrameThickness="0" ResizeBorderThickness="4" CaptionHeight="0" CornerRadius="0" />
    </WindowChrome.WindowChrome>
</Window>