本文实例讲述了C#实现压缩和解压缩的方法。分享给大家供大家参考，具体如下：
使用ICSharpCode.SharpZipLib.dll来压缩/解压（压缩效率比GZip要高一点）
public static class ZipUtil
{
/// <summary>
/// 压缩
/// </summary>
/// <param name="param"></param>
/// <returns></returns>
public static string Compress( string param)
{
byte [] data = System.Text.Encoding.UTF8.GetBytes(param);
//byte[] data = Convert.FromBase64String(param);
MemoryStream ms = new MemoryStream();
Stream stream = new ICSharpCode.SharpZipLib.BZip2.BZip2OutputStream(ms);
try
{
stream.Write(data, 0, data.Length);
}
finally
{
stream.Close();
ms.Close();
}
return Convert.ToBase64String(ms.ToArray());
}
/// <summary>
/// 解压
/// </summary>
/// <param name="param"></param>
/// <returns></returns>
public static string Decompress( string param)
{
string commonString = "" ;
byte [] buffer = Convert.FromBase64String(param);
MemoryStream ms = new MemoryStream(buffer);
Stream sm = new ICSharpCode.SharpZipLib.BZip2.BZip2InputStream(ms);
//这里要指明要读入的格式，要不就有乱码
StreamReader reader = new StreamReader(sm, System.Text.Encoding.UTF8);
try
{
commonString = reader.ReadToEnd();
}
finally
{
sm.Close();
ms.Close();
}
return commonString;
}
}
使用GZip来压缩/解压缩（字符串）
public static class GZipUtil
{
public static string Zip( string value)
{
//Transform string into byte[]
byte [] byteArray = new byte [value.Length];
int indexBA = 0;
foreach ( char item in value.ToCharArray())
{
byteArray[indexBA++] = ( byte )item;
}
//Prepare for compress
System.IO.MemoryStream ms = new System.IO.MemoryStream();
System.IO.Compression.GZipStream sw = new System.IO.Compression.GZipStream(ms,
System.IO.Compression.CompressionMode.Compress);
//Compress
sw.Write(byteArray, 0, byteArray.Length);
//Close, DO NOT FLUSH cause bytes will go missing...
sw.Close();
//Transform byte[] zip data to string
byteArray = ms.ToArray();
System.Text.StringBuilder sB = new System.Text.StringBuilder(byteArray.Length);
foreach ( byte item in byteArray)
{
sB.Append(( char )item);
}
ms.Close();
sw.Dispose();
ms.Dispose();
return sB.ToString();
}
public static string UnZip( string value)
{
//Transform string into byte[]
byte [] byteArray = new byte [value.Length];
int indexBA = 0;
foreach ( char item in value.ToCharArray())
{
byteArray[indexBA++] = ( byte )item;
}
//Prepare for decompress
System.IO.MemoryStream ms = new System.IO.MemoryStream(byteArray);
System.IO.Compression.GZipStream sr = new System.IO.Compression.GZipStream(ms,
System.IO.Compression.CompressionMode.Decompress);
//Reset variable to collect uncompressed result
byteArray = new byte [byteArray.Length];
//Decompress
int rByte = sr.Read(byteArray, 0, byteArray.Length);
//Transform byte[] unzip data to string
System.Text.StringBuilder sB = new System.Text.StringBuilder(rByte);
//Read the number of bytes GZipStream red and do not a for each bytes in
//resultByteArray;
for ( int i = 0; i < rByte; i++)
{
sB.Append(( char )byteArray[i]);
}
sr.Close();
ms.Close();
sr.Dispose();
ms.Dispose();
return sB.ToString();
}
}
希望本文所述对大家C#程序设计有所帮助。
dy("nrwz");
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