第一种方法调用winrar软件来实现．优点：目录层次清晰，与原来结构一样．缺点：如压缩深目录内的文件夹，目录路径也会压进去．没找到解决办法．
1.引用
using System.IO;
using Microsoft.Win32;
using System.Diagnostics;
/******************************************************
程序用途:实现文件[文件夹]压缩解压功能函数
程序备注:
* 服务器端WinRAR支持
* 路径简述必须绝对路径
******************************************************/
2.主要代码之压缩
/// <summary>
/// 压缩文件
/// </summary>
/// <param name="DFilePath">需要压缩的文件夹或者单个文件</param>
/// <param name="DRARName">生成压缩文件的文件名</param>
/// <param name="DRARPath">生成压缩文件保存路径</param>
/// <returns></returns>
protected bool RAR(string DFilePath, string DRARName,string DRARPath)
{
String the_rar;
RegistryKey the_Reg;
Object the_Obj;
String the_Info;
ProcessStartInfo the_StartInfo;
Process the_Process;
try
{
the_Reg = Registry.ClassesRoot.OpenSubKey(@"Applications\WinRAR.exe\Shell\Open\Command");
the_Obj = the_Reg.GetValue("");
the_rar = the_Obj.ToString();
the_Reg.Close();
the_rar = the_rar.Substring(1, the_rar.Length - 7);
the_Info = " a " + " " + DRARName + " " + DFilePath; //命令 + 压缩后文件名 + 被压缩的文件或者路径
the_StartInfo = new ProcessStartInfo();
the_StartInfo.FileName = the_rar;
the_StartInfo.Arguments = the_Info;
the_StartInfo.WindowStyle = ProcessWindowStyle.Hidden;
the_StartInfo.WorkingDirectory = DRARPath ; //RaR文件的存放目录。
the_Process = new Process();
the_Process.StartInfo = the_StartInfo;
the_Process.Start();
return true;
}
catch (Exception ex)
{
return false;
}
}
3.主要代码之解压
/// <summary>
/// 解压缩到指定文件夹
/// </summary>
/// <param name="RARFilePath">压缩文件存在的目录 </param>
/// <param name="RARFileName">压缩文件名称 </param>
/// <param name="UnRARFilePath">解压到文件夹</param>
/// <returns></returns>
protected bool UnRAR(string RARFilePath,string RARFileName,string UnRARFilePath)
{
//解压缩
String the_rar;
RegistryKey the_Reg;
Object the_Obj;
String the_Info;
ProcessStartInfo the_StartInfo;
Process the_Process;
try
{
the_Reg = Registry.ClassesRoot.OpenSubKey(@"Applications\WinRar.exe\Shell\Open\Command");
the_Obj = the_Reg.GetValue("");
the_rar = the_Obj.ToString();
the_Reg.Close();
the_rar = the_rar.Substring(1, the_rar.Length - 7);
the_Info = @" X " + " " + RARFilePath + RARFileName + " " + UnRARFilePath;
the_StartInfo = new ProcessStartInfo();
the_StartInfo.FileName = the_rar;
the_StartInfo.Arguments = the_Info;
the_StartInfo.WindowStyle = ProcessWindowStyle.Hidden;
the_Process = new Process();
the_Process.StartInfo = the_StartInfo;
the_Process.Start();
return true;
}
catch (Exception ex)
{
return false;
}
}
3.示例
string oFilePath = @"C:\1\";
string oRARFileName = "1.rar";
string oToFilePath = @"C:\2\";
//if (RAR(oFilePath, oRARFileName, oToFilePath))
if (UnRAR(oFilePath, oRARFileName, oToFilePath))
Response.Write("OK");
else
Response.Write("No");
第二种是用.net自己的类．缺点：目录不清晰，一个目录一压就成一个文件了．优点：压缩无目录痕迹（压缩后就成一个文件了，哪还有痕迹？５５５）．
gzipstream的包装类（转载)
namespace GreatCHN.GZipCompression
{
public class GZipCompress
{
/// <summary>
/// 对目标文件夹进行压缩，将压缩结果保存为指定文件
/// </summary>
/// <param name="dirPath">目标文件夹</param>
/// <param name="fileName">压缩文件</param>
public static void Compress(string dirPath, string fileName)
{
ArrayList list = new ArrayList();
foreach (string f in Directory.GetFiles(dirPath))
{
byte[] destBuffer = File.ReadAllBytes(f);
SerializeFileInfo sfi = new SerializeFileInfo(f, destBuffer);
list.Add(sfi);
}
IFormatter formatter = new BinaryFormatter();
using (Stream s = new MemoryStream())
{
formatter.Serialize(s, list);
s.Position = 0;
CreateCompressFile(s, fileName);
}
}
/**/
/// <summary>
/// 对目标压缩文件解压缩，将内容解压缩到指定文件夹
/// </summary>
/// <param name="fileName">压缩文件</param>
/// <param name="dirPath">解压缩目录</param>
public static void DeCompress(string fileName, string dirPath)
{
using (Stream source = File.OpenRead(fileName))
{
using (Stream destination = new MemoryStream())
{
using (GZipStream input = new GZipStream(source, CompressionMode.Decompress, true))
{
byte[] bytes = new byte[4096];
int n;
while ((n = input.Read(bytes, 0, bytes.Length)) != 0)
{
destination.Write(bytes, 0, n);
}
}
destination.Flush();
destination.Position = 0;
DeSerializeFiles(destination, dirPath);
}
}
}
private static void DeSerializeFiles(Stream s, string dirPath)
{
BinaryFormatter b = new BinaryFormatter();
ArrayList list = (ArrayList)b.Deserialize(s);
foreach (SerializeFileInfo f in list)
{
string newName = dirPath + Path.GetFileName(f.FileName);
using (FileStream fs = new FileStream(newName, FileMode.Create, FileAccess.Write))
{
fs.Write(f.FileBuffer, 0, f.FileBuffer.Length);
fs.Close();
}
}
}
private static void CreateCompressFile(Stream source, string destinationName)
{
using (Stream destination = new FileStream(destinationName, FileMode.Create, FileAccess.Write))
{
using (GZipStream output = new GZipStream(destination, CompressionMode.Compress))
{
byte[] bytes = new byte[4096];
int n;
while ((n = source.Read(bytes, 0, bytes.Length)) != 0)
{
output.Write(bytes, 0, n);
}
}
}
}
[Serializable]
class SerializeFileInfo
{
public SerializeFileInfo(string name, byte[] buffer)
{
fileName = name;
fileBuffer = buffer;
}
string fileName;
public string FileName
{
get
{
return fileName;
}
}
byte[] fileBuffer;
public byte[] FileBuffer
{
get
{
return fileBuffer;
}
}
}
}
}
两种方法各有优略吧．