using System; 
using System.Text; 
using System.IO; 
using System.IO.Compression; 
using System.Collections.Generic; 

namespace DatabaseUtilLib 
{ 

public class ZipWrapper 
{ 

public static string Compress(string str) 
{ 
//因输入的字符串不是Base64所以转换为Base64,因为HTTP如果不传递Base64则会发生http 400错误 

return Convert.ToBase64String(Compress(Encoding.Default.GetBytes(str))); 
} 

public static string Decompress(string str) 
{ 
return Encoding.Default.GetString(Decompress(Convert.FromBase64String(str))); 
} 

public static byte[] Compress(byte[] bytes) 
{ 
using (MemoryStream ms = new MemoryStream()) 
{ 
GZipStream Compress = new GZipStream(ms, CompressionMode.Compress); 

Compress.Write(bytes, 0, bytes.Length); 

Compress.Close(); 

return ms.ToArray(); 

} 
} 

public static byte[] Decompress(Byte[] bytes) 
{ 
using (MemoryStream tempMs = new MemoryStream()) 
{ 
using (MemoryStream ms = new MemoryStream(bytes)) 
{ 
GZipStream Decompress = new GZipStream(ms, CompressionMode.Decompress); 

Decompress.CopyTo(tempMs); 

Decompress.Close(); 

return tempMs.ToArray(); 
} 
} 
} 
} 
}