Klasse zum ändern des Desktophintergrund (Wallpaper)

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public class Wallpaper
{
    const int SPI_SETDESKWALLPAPER = 20;
    const int SPIF_UPDATEINIFILE = 0x01;
    const int SPIF_SENDWININICHANGE = 0x02;

    public Wallpaper()
    {
    }

    [DllImport("user32.dll", CharSet = CharSet.Auto)]
    static extern int SystemParametersInfo(
        int uAction, int uParam, string lpvParam, int fuWinIni);

    public enum Style : int
    {
        Tiled, Centered, Stretched
    }

    public void SetWallpaper(string path, Style style)
    {           
        if (System.IO.File.Exists(path))
        {
            RegistryKey key = Registry.CurrentUser.OpenSubKey("Control Panel\\Desktop", true);

            switch (style)
            {
                case Style.Stretched:
                    key.SetValue(@"WallpaperStyle", "2");
                    key.SetValue(@"TileWallpaper", "0");
                    break;
                case Style.Centered:
                    key.SetValue(@"WallpaperStyle", "1");
                    key.SetValue(@"TileWallpaper", "0");
                    break;
                case Style.Tiled:
                    key.SetValue(@"WallpaperStyle", "1");
                    key.SetValue(@"TileWallpaper", "1");
                    break;
            }
            SystemParametersInfo(SPI_SETDESKWALLPAPER, 0, path, SPIF_UPDATEINIFILE | SPIF_SENDWININICHANGE);
        }
        else
        {
            throw new System.IO.FileNotFoundException();
        }
    }
}