C# Icon轉Byte , Byte轉Icon

Icon直接保存成ico文件會嚴重失真，能夠保存爲png格式。

 

但若是要轉換到byte，直接使用Icon.ToBitmap().Save方法會出錯，須要帶一點參數。具體代碼以下

 

    public class IconHelper
    {
        /// <summary>
        /// Byte轉Icon
        /// </summary>
        /// <param name="buffer"></param>
        /// <returns></returns>
        public static Icon FromByte(byte[] buffer)
        {
            return Icon.FromHandle(new System.Drawing.Bitmap(new MemoryStream(buffer)).GetHicon());
        }

        /// <summary>
        /// Icon轉Byte
        /// </summary>
        /// <param name="icon"></param>
        /// <returns></returns>
        public static byte[] ToByte(Icon icon)
        {
            Encoder myEncoder = Encoder.Quality;
            EncoderParameter myEncoderParameter = new EncoderParameter(myEncoder, 100);
            EncoderParameters encoders = new EncoderParameters(1);
            encoders.Param[0] = myEncoderParameter;
            ImageCodecInfo myImageCodecInfo = GetEncoderInfo("image/png");

            using (MemoryStream ms = new MemoryStream())
            {
                icon.ToBitmap().Save(ms, myImageCodecInfo, encoders);
                return ms.GetBuffer();
            }
        }

        private static ImageCodecInfo GetEncoderInfo(string mimeType)
        {
            int j;
            ImageCodecInfo[] encoders = ImageCodecInfo.GetImageEncoders();
            for (j = 0; j < encoders.Length; ++j)
            {
                if (encoders[j].MimeType == mimeType)
                    return encoders[j];
            }
            return null;
        }
    }