WPF Window with aero glass background. (C# .NET)

Usage, in your Window constructor do:

// ...  
public partial class Window1 : Window  
{  
  public Window1()  
  {  
      InitializeComponent();  
      this.GlassBackground();  
  }  
}  
// ...

Installation:

1. Add reference "System.Drawing" to your Project (Right click on References folder on your project, and Add reference)

2. Add to your project a class file (GlassExtensions.cs) replace the "YOURNAMESPACE" in with same namespace as in your Window1.xaml.cs, and paste this:

using System;  
using System.Drawing;  
using System.Windows;  
using System.Windows.Media;  
using System.Runtime.InteropServices;  
using System.Windows.Interop;  
  
namespace YOURNAMESPACE  
{  
public static class GlassingExtension  
{  
    /// <summary>  
    /// Sets glass background to whole window.  
    /// </summary>  
    /// <remarks>Remember to set your WPF Window Background to "Transparent"!</remarks>  
    /// <param name="win"></param>  
    public static void GlassBackground(this Window win)  
    {  
        // Glass extend WINAPI thingie http://msdn.microsoft.com/en-us/library/aa969512%28VS.85%29.aspx form more details  
        // If any of the margins is "-1" the whole window is glass!  
        win.GlassBackground(-1, 0, 0, 0);  
    }  
    /// <summary>  
    /// Sets glass background to custom margins in the window.  
    /// </summary>  
    /// <param name="win"></param>  
    public static void GlassBackground(this Window win, int left, int right, int top, int bottom)  
    {  
        // Why would you read the inner workings? Why? If you need to know why...  
        // DwmExtendFrameIntoClientArea http://msdn.microsoft.com/en-us/library/aa969512%28VS.85%29.aspx is the magical WINAPI call  
        // rest is just crap to get its parameters populated.  
        win.Loaded += delegate(object sender, RoutedEventArgs e)  
        {  
            try  
            {  
                // Obtain the window handle for WPF application  
                IntPtr mainWindowPtr = new WindowInteropHelper(win).Handle;  
                HwndSource mainWindowSrc = HwndSource.FromHwnd(mainWindowPtr);  
  
                // Transparent shall be glassed!  
                mainWindowSrc.CompositionTarget.BackgroundColor = System.Windows.Media.Colors.Transparent;  
  
                // Margin for the DwmExtendFrameIntoClientArea WINAPI call.  
                NonClientRegionAPI.MARGINS margins = new NonClientRegionAPI.MARGINS();  
                margins.cxLeftWidth = left;  
                margins.cxRightWidth = right;  
                margins.cyBottomHeight = bottom;  
                margins.cyTopHeight = top;  
  
                // Glass extend WINAPI thingie http://msdn.microsoft.com/en-us/library/aa969512%28VS.85%29.aspx form more details  
                int hr = NonClientRegionAPI.DwmExtendFrameIntoClientArea(mainWindowSrc.Handle, ref margins);  
                if (hr < 0)  
                {  
                    //DwmExtendFrameIntoClientArea Failed  
                } else {  
                    win.Background = System.Windows.Media.Brushes.Transparent;  
                }  
            }  
            // If not glassing capabilities (Windows XP...), paint background white.  
            catch (DllNotFoundException)  
            {  
                Application.Current.MainWindow.Background = System.Windows.Media.Brushes.White;  
            }  
        };  
    }  
  
    #region WINAPI Crap, none should handle this in 21st century  
    private class NonClientRegionAPI  
    {  
        [StructLayout(LayoutKind.Sequential)]  
        public struct MARGINS  
        {  
            public int cxLeftWidth;      // width of left border that retains its size  
            public int cxRightWidth;     // width of right border that retains its size  
            public int cyTopHeight;      // height of top border that retains its size  
            public int cyBottomHeight;   // height of bottom border that retains its size  
        };  
  
  
        [DllImport("DwmApi.dll")]  
        public static extern int DwmExtendFrameIntoClientArea(  
            IntPtr hwnd,  
            ref MARGINS pMarInset);  
  
    }  
    #endregion  
}  
}