使用.Net自带的GZipStream进行流压缩与解压

 using System.IO;
 using System.IO.Compression;
 using System.Text;

 namespace CS.Utility
 {
     /// <summary>
     /// 压缩与解压缩处理
     /// </summary>
     public static class Compressor
     {

         /// <summary>
         /// 压缩字符串
         /// </summary>
         /// <param name="str"></param>
         /// <returns></returns>
         public static byte[] Compress(string str)
         {
             var data = Encoding.UTF8.GetBytes(str);
             return Compress(data);
         }

         /// <summary>
         /// 压缩二进制流
         /// </summary>
         /// <param name="data"></param>
         /// <returns></returns>
         public static byte[] Compress(byte[] data)
         {
             using (var memoryStream = new MemoryStream())
             {
                 using (var compressionStream = new GZipStream(memoryStream, CompressionMode.Compress))
                 {
                     compressionStream.Write(data, , data.Length);
                     compressionStream.Flush();
                 }
                 //必须先关了compressionStream后才能取得正确的压缩流
                 return memoryStream.ToArray();
             }
         }

         /// <summary>
         /// 解压二进制流
         /// </summary>
         /// <param name="data"></param>
         /// <returns></returns>
         public static byte[] Depress(byte[] data)
         {
             using (var memoryStream = new MemoryStream(data))
             using (var outStream = new MemoryStream())
             {
                 using (var compressionStream = new GZipStream(memoryStream, CompressionMode.Decompress))
                 {
                     compressionStream.CopyTo(outStream);
                     compressionStream.Flush();
                 }
                 return outStream.ToArray();
             }
         }
     }
 }

参考资料：http://msdn.microsoft.com/zh-cn/library/ms404280(v=vs.110).aspx