public class Compression
    {
        /// <summary>
        /// 对字符串进行压缩
        /// </summary>
        /// <param name="str">待压缩的字符串</param>
        /// <returns>压缩后的字符串</returns>
         public static string CompressString(string str)
        {   
            string compressString = "";
            byte[] compressBeforeByte = Encoding.GetEncoding("UTF-8").GetBytes(str);
            byte[] compressAfterByte=Compress(compressBeforeByte);
            //compressString = Encoding.GetEncoding("UTF-8").GetString(compressAfterByte);
            compressString = Convert.ToBase64String(compressAfterByte);
            return compressString;
        }
        /// <summary>
        /// 对字符串进行解压缩
        /// </summary>
        /// <param name="str">待解压缩的字符串</param>
        /// <returns>解压缩后的字符串</returns>
        public static string DecompressString(string str)
        {
            string compressString = "";
            //byte[] compressBeforeByte = Encoding.GetEncoding("UTF-8").GetBytes(str);
            byte[] compressBeforeByte = Convert.FromBase64String(str);
            byte[] compressAfterByte = Decompress(compressBeforeByte);
            compressString = Encoding.GetEncoding("UTF-8").GetString(compressAfterByte);
            return compressString;
        }
        /// <summary>
        /// 对文件进行压缩
        /// </summary>
        /// <param name="sourceFile">待压缩的文件名</param>
        /// <param name="destinationFile">压缩后的文件名</param>
        public static void CompressFile(string sourceFile, string destinationFile)
        {
            throw new Exception("The method or operation is not implemented.");
        }
        /// <summary>
        /// 对文件进行解压缩
        /// </summary>
        /// <param name="sourceFile">待解压缩的文件名</param>
        /// <param name="destinationFile">解压缩后的文件名</param>
        /// <returns></returns>
        public static void DecompressFile(string sourceFile, string destinationFile)
        {
            throw new Exception("The method or operation is not implemented.");
        }
        /// <summary>
        /// 对byte数组进行压缩
        /// </summary>
        /// <param name="data">待压缩的byte数组</param>
        /// <returns>压缩后的byte数组</returns>
        public static byte[] Compress(byte[] data)
        {
            try
            {
                MemoryStream ms = new MemoryStream();
                GZipStream zip = new GZipStream(ms, CompressionMode.Compress,true);
                zip.Write(data, 0, data.Length);
                zip.Close();
                byte[] buffer = new byte[ms.Length];
                ms.Position=0;
                ms.Read(buffer, 0, buffer.Length);
                ms.Close();
                return buffer;

            }
            catch (Exception e)
            {
                throw new Exception(e.Message);
            }
        }
        public static byte[] Decompress(byte[] data)
        {
            try
            {
                MemoryStream ms = new MemoryStream(data);
                GZipStream zip = new GZipStream(ms, CompressionMode.Decompress, true);
                MemoryStream msreader = new MemoryStream();
                byte[] buffer = new byte[0x1000];
                while (true)
                {
                    int reader = zip.Read(buffer, 0, buffer.Length);
                    if (reader <= 0)
                    {
                        break;
                    }
                    msreader.Write(buffer, 0, reader);
                }
                zip.Close();
                ms.Close();
                msreader.Position = 0;
                buffer = msreader.ToArray();
                msreader.Close();
                return buffer;
            }
            catch (Exception e)
            {
                throw new Exception(e.Message);
            }
        }
    }
//csharp/8278