Gzip壓縮和解壓

        /// <summary>
        /// 將傳入字元串以GZip演算法壓縮後，返回Base64編碼字元
        /// </summary>
        /// <param name="rawString">需要壓縮的字元串</param>
        /// <returns>壓縮後的Base64編碼的字元串</returns>
        public string GZipCompressString(string rawString)
        {
            if (string.IsNullOrEmpty(rawString) || rawString.Length == 0)
            {
                return "";
            }
            else
            {
                byte[] rawData = System.Text.Encoding.UTF8.GetBytes(rawString.ToString());
                byte[] zippedData = Compress(rawData);
                return (string)(Convert.ToBase64String(zippedData));
            }
        }

        /// <summary>
        /// GZip壓縮
        /// </summary>
        /// <param name="rawData"></param>
        /// <returns></returns>
        static byte[] Compress(byte[] rawData)
        {
            MemoryStream ms = new MemoryStream();
            GZipStream compressedzipStream = new GZipStream(ms, CompressionMode.Compress, true);
            compressedzipStream.Write(rawData, 0, rawData.Length);
            compressedzipStream.Close();
            return ms.ToArray();
        }
        /// <summary>
        /// 將傳入的二進位字元串資料以GZip演算法解壓縮
        /// </summary>
        /// <param name="zippedString">經GZip壓縮後的二進位字元串</param>
        /// <returns>原始未壓縮字元串</returns>
        public static string GZipDecompressString(string zippedString)
        {
            if (string.IsNullOrEmpty(zippedString) || zippedString.Length == 0)
            {
                return "";
            }
            else
            {
                byte[] zippedData = Convert.FromBase64String(zippedString.ToString());
                using (var ms = new MemoryStream(zippedData))
                {
                    using (var zip = new GZipStream(ms, CompressionMode.Decompress))
                    {
                        using (var reader = new StreamReader(zip))
                        {
                            return reader.ReadToEnd();
                        }
                    }
                }
            }
        }