Gzip压缩和解压

        /// <summary>
        /// 将传入字符串以gzip算法压缩后，返回base64编码字符
        /// </summary>
        /// <param name="rawstring">需要压缩的字符串</param>
        /// <returns>压缩后的base64编码的字符串</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压缩
        /// </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>
        /// 将传入的二进制字符串资料以gzip算法解压缩
        /// </summary>
        /// <param name="zippedstring">经gzip压缩后的二进制字符串</param>
        /// <returns>原始未压缩字符串</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();
                        }
                    }
                }
            }
        }