wpf 透明效果 需要DwmApi.dll文件，然后定义一个函数去画Aero区域，从而实现整个窗口的Aero化。

private void ExtendAeroGlass(Window window)
{
try
{
// 为WPF程序获取窗口句柄
IntPtr mainWindowPtr = new WindowInteropHelper(window).Handle;
HwndSource mainWindowSrc = HwndSource.FromHwnd(mainWindowPtr);
mainWindowSrc.CompositionTarget.BackgroundColor = Colors.Transparent;

// 设置Margins
MARGINS margins = new MARGINS();

// 扩展Aero Glass
margins.cxLeftWidth = -1;
margins.cxRightWidth = -1;
margins.cyTopHeight = -1;
margins.cyBottomHeight = -1;

int hr = DwmExtendFrameIntoClientArea(mainWindowSrc.Handle, ref margins);
if (hr < 0)
{
MessageBox.Show("DwmExtendFrameIntoClientArea Failed");
}
}
catch (DllNotFoundException)
{
Application.Current.MainWindow.Background = Brushes.White;
}
}

[StructLayout(LayoutKind.Sequential)]
public struct MARGINS
{
public int cxLeftWidth;
public int cxRightWidth;
public int cyTopHeight;
public int cyBottomHeight;
};

[DllImport("DwmApi.dll")]
public static extern int DwmExtendFrameIntoClientArea(
IntPtr hwnd,
ref MARGINS pMarInset);