我要评论本文实例讲述了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();
}
}
更多关于c#相关内容感兴趣的读者可查看本站专题：《c#常见控件用法教程》、《winform控件用法总结》、《c#数据结构与算法教程》、《c#面向对象程序设计入门教程》及《c#程序设计之线程使用技巧总结》
希望本文所述对大家c#程序设计有所帮助。
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