zip格式压缩、解压缩（C#）

压缩方法

        #region 压缩

        /// <summary>
        /// 压缩
        /// </summary>
        /// <param name="bytes">未被压缩的字节数据</param>
        /// <returns></returns>
        public static byte[] Compress(byte[] bytes)
        {
            if (bytes == null)
                return null;

            using (MemoryStream oStream = new MemoryStream())   //压缩
            {
                GZipStream zipStream = new GZipStream(oStream, CompressionMode.Compress);
                zipStream.Write(bytes, 0, bytes.Length);
                zipStream.Flush();
                zipStream.Close();

                return oStream.ToArray();
            }
        }

        /// <summary>
        /// 压缩
        /// </summary>
        /// <param name="dataOriginal">未被压缩的数据</param>
        /// <returns></returns>
        public static byte[] Compress(object dataOriginal)
        {
            if (dataOriginal == null)
                return null;

            byte[] bytes = null;
            using (MemoryStream mStream = new MemoryStream())     //序列化成二进制数组
            {
                BinaryFormatter bFormatter = new BinaryFormatter();
                bFormatter.Serialize(mStream, dataOriginal);
                bytes = mStream.ToArray();
            }

            return Compress(bytes);
        }

        /// <summary>
        /// 压缩字符串
        /// </summary>
        /// <param name="unZipData">未被压缩的数据</param>
        /// <returns></returns>
        public static string Compress(string unZipData)
        {
            if (string.IsNullOrEmpty(unZipData))
                return null;
            var bytes = Compress(unZipData as object);
            if (bytes == null)
                return null;

            return Convert.ToBase64String(bytes);   //一定要Base64，否则会出错
        }

        #endregion

解压方法

        #region 解压缩

        /// <summary>
        /// 解压缩
        /// </summary>
        /// <param name="stream">流</param>
        /// <returns></returns>
        public static object Decompress(Stream stream)
        {
            stream.Seek(0, SeekOrigin.Begin);
            GZipStream unZipStream = new GZipStream(stream, CompressionMode.Decompress, true);
            object dsResult = null;
            BinaryFormatter bFormatter = new BinaryFormatter();
            dsResult = bFormatter.Deserialize(unZipStream) as object;
            unZipStream.Close();

            return dsResult;
        }

        /// <summary>
        /// 解压缩
        /// </summary>
        /// <param name="bytes">压缩后的字节数组</param>
        /// <returns></returns>
        public static object Decompress(byte[] bytes)
        {
            if (bytes == null) 
                return null;
            using (MemoryStream mStream = new MemoryStream(bytes))
            {
                return Decompress(mStream);
            }
            
        }

        /// <summary>
        /// 解压缩字符串
        /// </summary>
        /// <param name="zipData">被压缩的字符串</param>
        /// <returns></returns>
        public static string Decompress(string zipData)
        {
            if (string.IsNullOrEmpty(zipData))
                return null;
            var bytes = Convert.FromBase64String(zipData);   //一定要Base64，否则会出错

            return Decompress(bytes) as string;
        }

        #endregion

字符串压缩、解压缩 字节数组和字符串的相互装换要用Base64编码！