JPG,PNG等格式的图片转换的ICON保存为ICO文件

            Bitmap myBitmap = new Bitmap(Image.FromFile(filePath ), 32, 32);
            IntPtr Hicon = myBitmap.GetHicon();
            Icon newIcon = Icon.FromHandle(Hicon);
            FileStream outStream = new FileStream(@"d:/a.ico", FileMode.OpenOrCreate);
            newIcon.Save(outStream);
            outStream.Flush();
            outStream.Close();