实现毛玻璃效果

经过测试只能在Windows7 下正常使用，在Win8或者Xp下面无法正常显示毛玻璃效果。首先你要先创建一个结构体如下:

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[StructLayout(LayoutKind.Sequential)]
public struct MARGINS
{
    public MARGINS(Thickness t)
    {
        Left = (int)t.Left;
        Right = (int)t.Right;
        Top = (int)t.Top;
        Bottom = (int)t.Bottom;
    }
    public int Left;
    public int Right;
    public int Top;
    public int Bottom;
}

之后再创建一个辅助类:

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public class GlassHelper
{
    [DllImport("dwmapi.dll", PreserveSig = false)]
    static extern void DwmExtendFrameIntoClientArea(
        IntPtr hWnd, ref MARGINS pMarInset);
    [DllImport("dwmapi.dll", PreserveSig = false)]
    static extern bool DwmIsCompositionEnabled();

    public static bool ExtendGlassFrame(Window window, Thickness margin)
    {
        if (!DwmIsCompositionEnabled())
            return false;

        IntPtr hwnd = new WindowInteropHelper(window).Handle;
        if (hwnd == IntPtr.Zero)
            throw new InvalidOperationException(
            "The Window must be shown before extending glass.");

        // 将Win32或者WPF程序背景设置为透明
        window.Background = Brushes.Transparent;
        HwndSource.FromHwnd(hwnd).CompositionTarget.BackgroundColor = Colors.Transparent;

        MARGINS margins = new MARGINS(margin);
        DwmExtendFrameIntoClientArea(hwnd, ref margins);
        return true;
    }
}

然后你只需要重写 OnSourceInitialized 方法即可。

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protected override void OnSourceInitialized(EventArgs e)
{
    base.OnSourceInitialized(e);
    GlassHelper.ExtendGlassFrame(this, new Thickness(-1));
}

效果图:

效果图