C# GZip对字符串压缩和解压

using System;  using System.Collections.Generic;  using System.Linq;  using System.Text;  using System.IO;  using System.IO.Compression;  using System.Data;    namespace HelperProjects  {      public class ZipHelper      {          /// 
          /// 解压          /// 
          ///           /// 
               public static DataSet GetDatasetByString(string Value)          {              DataSet ds = new DataSet();              string CC = GZipDecompressString(Value);              System.IO.StringReader Sr = new StringReader(CC);              ds.ReadXml(Sr);              return ds;          }          /// 
          /// 根据DATASET压缩字符串          /// 
          ///           /// 
               public static string GetStringByDataset(string ds)          {              return GZipCompressString(ds);          }         /// 
         /// 将传入字符串以GZip算法压缩后，返回Base64编码字符         /// 
         /// 需要压缩的字符串         /// 
     
      压缩后的Base64编码的字符串
               public static 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));              }            }          /// 
          /// GZip压缩          /// 
          ///           /// 
               public 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();          }          /// 
          /// 将传入的二进制字符串资料以GZip算法解压缩          /// 
          /// 经GZip压缩后的二进制字符串          /// 
     
      原始未压缩字符串
               public static string GZipDecompressString(string zippedString)          {              if (string.IsNullOrEmpty(zippedString) || zippedString.Length == 0)              {                  return "";              }              else              {                  byte[] zippedData = Convert.FromBase64String(zippedString.ToString());                  return (string)(System.Text.Encoding.UTF8.GetString(Decompress(zippedData)));              }          }          /// 
          /// ZIP解压          /// 
          ///           /// 
               public static byte[] Decompress(byte[] zippedData)          {              MemoryStream ms = new MemoryStream(zippedData);              GZipStream compressedzipStream = new GZipStream(ms, CompressionMode.Decompress);              MemoryStream outBuffer = new MemoryStream();              byte[] block = new byte[1024];              while (true)              {                  int bytesRead = compressedzipStream.Read(block, 0, block.Length);                  if (bytesRead <= 0)                      break;                  else                      outBuffer.Write(block, 0, bytesRead);              }              compressedzipStream.Close();              return outBuffer.ToArray();          }      }  }