效果图：
有不少示例介绍了如何将Vista Aero效果扩展到整个窗口，但大都是针对Windows Form应用程序，而不是WPF（即前者针对的是Form类，后者是针对的Window类），比如http://www.cnblogs.com/zhouyinhui/archive/2007/05/30/765416.html
其实与其类似，都是调用dwmapi，只不过Window类没有直接给我们提供句柄，我们需要这样的代码来找到其句柄：
IntPtr hwnd = new System.Windows.Interop.WindowInteropHelper(window).Handle;
然后将窗口的背景设置为透明：
window.Background = Brushes.Transparent;
HwndSource.FromHwnd(hwnd).CompositionTarget.BackgroundColor = Colors.Transparent;最后调用
DwmApi.DwmExtendFrameIntoClientArea(hwnd, margins);
注意，我们应该在窗口被显示之后（SourceInitialized之后）再调用我们的函数否则会引发异常。
参考代码：
public partial class Window1 : System.Windows.Window
{
public Window1()
{
InitializeComponent();
}
protected override void OnSourceInitialized(EventArgs e)
{
base.OnSourceInitialized(e);
DWMLib.AeroHelper.ExtendGlassFrame(this, new Thickness(-1));
}
}
public class AeroHelper
{
public static bool ExtendGlassFrame(Window window, Thickness margin)
{
if (!DwmApi.DwmIsCompositionEnabled())
return false;
IntPtr hwnd = new WindowInteropHelper(window).Handle;
if (hwnd == IntPtr.Zero)
throw new InvalidOperationException("The Window must be shown before extending glass.");
// Set the background to transparent from both the WPF and Win32 perspectives
window.Background = Brushes.Transparent;
HwndSource.FromHwnd(hwnd).CompositionTarget.BackgroundColor = Colors.Transparent;
DWMLib.DwmApi.MARGINS margins = new DWMLib.DwmApi.MARGINS((int)margin.Left, (int)margin.Top, (int)margin.Right, (int)margin.Bottom);
DwmApi.DwmExtendFrameIntoClientArea(hwnd, margins);
return true;
}
public class DwmApi
{
[DllImport("dwmapi.dll", PreserveSig = false)]
public static extern void DwmEnableBlurBehindWindow(IntPtr hWnd, DWM_BLURBEHIND pBlurBehind);
[DllImport("dwmapi.dll", PreserveSig = false)]
public static extern void DwmExtendFrameIntoClientArea(IntPtr hWnd, MARGINS pMargins);
[DllImport("dwmapi.dll", PreserveSig = false)]
public static extern bool DwmIsCompositionEnabled();
[DllImport("dwmapi.dll", PreserveSig = false)]
public static extern void DwmGetColorizationColor(
out int pcrColorization,
[MarshalAs(UnmanagedType.Bool)]out bool pfOpaqueBlend);
[DllImport("dwmapi.dll", PreserveSig = false)]
public static extern void DwmEnableComposition(bool bEnable);
[DllImport("dwmapi.dll", PreserveSig = false)]
public static extern IntPtr DwmRegisterThumbnail(IntPtr dest, IntPtr source);
[DllImport("dwmapi.dll", PreserveSig = false)]
public static extern void DwmUnregisterThumbnail(IntPtr hThumbnail);
[DllImport("dwmapi.dll", PreserveSig = false)]
public static extern void DwmUpdateThumbnailProperties(IntPtr hThumbnail, DWM_THUMBNAIL_PROPERTIES props);
[DllImport("dwmapi.dll", PreserveSig = false)]
public static extern void DwmQueryThumbnailSourceSize(IntPtr hThumbnail, out Size size);
[StructLayout(LayoutKind.Sequential)]
public class DWM_THUMBNAIL_PROPERTIES
{
public uint dwFlags;
public RECT rcDestination;
public RECT rcSource;
public byte opacity;
[MarshalAs(UnmanagedType.Bool)]
public bool fVisible;
[MarshalAs(UnmanagedType.Bool)]
public bool fSourceClientAreaOnly;
public const uint DWM_TNP_RECTDESTINATION = 0x00000001;
public const uint DWM_TNP_RECTSOURCE = 0x00000002;
public const uint DWM_TNP_OPACITY = 0x00000004;
public const uint DWM_TNP_VISIBLE = 0x00000008;
public const uint DWM_TNP_SOURCECLIENTAREAONLY = 0x00000010;
}
[StructLayout(LayoutKind.Sequential)]
public class MARGINS
{
public int cxLeftWidth, cxRightWidth, cyTopHeight, cyBottomHeight;
public MARGINS(int left, int top, int right, int bottom)
{
cxLeftWidth = left;
cyTopHeight = top;
cxRightWidth = right;
cyBottomHeight = bottom;
}
}
[StructLayout(LayoutKind.Sequential)]
public class DWM_BLURBEHIND
{
public uint dwFlags;
[MarshalAs(UnmanagedType.Bool)]
public bool fEnable;
public IntPtr hRegionBlur;
[MarshalAs(UnmanagedType.Bool)]
public bool fTransitionOnMaximized;
public const uint DWM_BB_ENABLE = 0x00000001;
public const uint DWM_BB_BLURREGION = 0x00000002;
public const uint DWM_BB_TRANSITIONONMAXIMIZED = 0x00000004;
}
[StructLayout(LayoutKind.Sequential)]
public struct RECT
{
public int left, top, right, bottom;
public RECT(int left, int top, int right, int bottom)
{
this.left = left;
this.top = top;
this.right = right;
this.bottom = bottom;
}
}
}