C# GZip对字符串压缩和解压

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using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.IO; using System.IO.Compression; using System.Data;   namespace Lis2013HISWSTest {     public class ZipHelper     {         /// <summary>         /// 解压         /// </summary>         /// <param name="Value"></param>         /// <returns></returns>         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;         }         /// <summary>         /// 根据DATASET压缩字符串         /// </summary>         /// <param name="ds"></param>         /// <returns></returns>         public static string GetStringByDataset(string ds)         {             return GZipCompressString(ds);         }         /// <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 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));             }           }         /// <summary>         /// GZip压缩         /// </summary>         /// <param name="rawData"></param>         /// <returns></returns>         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();         }         /// <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());                 return (string)(System.Text.Encoding.UTF8.GetString(Decompress(zippedData)));             }         }         /// <summary>         /// ZIP解压         /// </summary>         /// <param name="zippedData"></param>         /// <returns></returns>         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();         }     } }