#region 获取windows桌面背景         [System.Runtime.InteropServices.DllImport("user32.dll", CharSet = System.Runtime.InteropServices.CharSet.Auto, SetLastError = true)]         public static extern int SystemParametersInfo(int uAction, int uParam, StringBuilder lpvParam, int fuWinIni);         private const int SPI_GETDESKWALLPAPER = 0x0073;         #endregion void WindowsBtn_Click(object sender, RoutedEventArgs e)         {             //定义存储缓冲区大小             StringBuilder s = new StringBuilder(300);             //获取Window 桌面背景图片地址，使用缓冲区             SystemParametersInfo(SPI_GETDESKWALLPAPER, 300, s, 0);             //缓冲区中字符进行转换             string wallpaper_path = s.ToString(); //系统桌面背景图片路径          }