首先要下一个dll，名字叫ICSharpCode.SharpZipLib.dll，下载链接在后面
这是类文件Gzip.cs
using System;
using System.Data;
using System.Configuration;
using System.Collections.Generic;
using System.IO;
using ICSharpCode.SharpZipLib.Zip;
using ICSharpCode.SharpZipLib.Checksums;
namespace WindowsApplication1
{
/// <summary>
/// 文件(夹)压缩、解压缩
/// </summary>
public class Gzip
{
#region 压缩文件
/// <summary>
/// 压缩文件
/// </summary>
/// <param name="fileNames">要打包的文件列表</param>
/// <param name="GzipFileName">目标文件名</param>
/// <param name="CompressionLevel">压缩品质级别（0~9）</param>
/// <param name="deleteFile">是否删除原文件</param>
public static void CompressFile(List<FileInfo> fileNames, string GzipFileName, int CompressionLevel, bool deleteFile)
{
ZipOutputStream s = new ZipOutputStream(File.Create(GzipFileName));
try
{
s.SetLevel(CompressionLevel); //0 - store only to 9 - means best compression
foreach (FileInfo file in fileNames)
{
FileStream fs = null;
try
{
fs = file.Open(FileMode.Open, FileAccess.ReadWrite);
}
catch
{ continue; }
// 方法二，将文件分批读入缓冲区
byte[] data = new byte[2048];
int size = 2048;
ZipEntry entry = new ZipEntry(Path.GetFileName(file.Name));
entry.DateTime = (file.CreationTime > file.LastWriteTime ? file.LastWriteTime : file.CreationTime);
s.PutNextEntry(entry);
while (true)
{
size = fs.Read(data, 0, size);
if (size <= 0) break;
s.Write(data, 0, size);
}
fs.Close();
if (deleteFile)
{
file.Delete();
}
}
}
finally
{
s.Finish();
s.Close();
}
}
/// <summary>
/// 压缩文件夹
/// </summary>
/// <param name="dirPath">要打包的文件夹</param>
/// <param name="GzipFileName">目标文件名</param>
/// <param name="CompressionLevel">压缩品质级别（0~9）</param>
/// <param name="deleteDir">是否删除原文件夹</param>
public static void CompressDirectory(string dirPath, string GzipFileName, int CompressionLevel, bool deleteDir)
{
//压缩文件为空时默认与压缩文件夹同一级目录
if (GzipFileName == string.Empty)
{
GzipFileName = dirPath.Substring(dirPath.LastIndexOf("//") + 1);
GzipFileName = dirPath.Substring(0, dirPath.LastIndexOf("//")) + "//" + GzipFileName + ".zip";
}
//if (Path.GetExtension(GzipFileName) != ".zip")
//{
// GzipFileName = GzipFileName + ".zip";
//}
using (ZipOutputStream zipoutputstream = new ZipOutputStream(File.Create(GzipFileName)))
{
zipoutputstream.SetLevel(CompressionLevel);
Crc32 crc = new Crc32();
Dictionary<string, DateTime> fileList = GetAllFies(dirPath);
foreach (KeyValuePair<string, DateTime> item in fileList)
{
FileStream fs = File.OpenRead(item.Key.ToString());
byte[] buffer = new byte[fs.Length];
fs.Read(buffer, 0, buffer.Length);
ZipEntry entry = new ZipEntry(item.Key.Substring(dirPath.Length));
entry.DateTime = item.Value;
entry.Size = fs.Length;
fs.Close();
crc.Reset();
crc.Update(buffer);
entry.Crc = crc.Value;
zipoutputstream.PutNextEntry(entry);
zipoutputstream.Write(buffer, 0, buffer.Length);
}
}
if (deleteDir)
{
Directory.Delete(dirPath, true);
}
}
/// <summary>
/// 获取所有文件
/// </summary>
/// <returns></returns>
private static Dictionary<string, DateTime> GetAllFies(string dir)
{
Dictionary<string, DateTime> FilesList = new Dictionary<string, DateTime>();
DirectoryInfo fileDire = new DirectoryInfo(dir);
if (!fileDire.Exists)
{
throw new System.IO.FileNotFoundException("目录:" + fileDire.FullName + "没有找到!");
}
GetAllDirFiles(fileDire, FilesList);
GetAllDirsFiles(fileDire.GetDirectories(), FilesList);
return FilesList;
}
/// <summary>
/// 获取一个文件夹下的所有文件夹里的文件
/// </summary>
/// <param name="dirs"></param>
/// <param name="filesList"></param>
private static void GetAllDirsFiles(DirectoryInfo[] dirs, Dictionary<string, DateTime> filesList)
{
foreach (DirectoryInfo dir in dirs)
{
foreach (FileInfo file in dir.GetFiles("*.*"))
{
filesList.Add(file.FullName, file.LastWriteTime);
}
GetAllDirsFiles(dir.GetDirectories(), filesList);
}
}
/// <summary>
/// 获取一个文件夹下的文件
/// </summary>
/// <param name="dir">目录名称</param>
/// <param name="filesList">文件列表HastTable</param>
private static void GetAllDirFiles(DirectoryInfo dir, Dictionary<string, DateTime> filesList)
{
foreach (FileInfo file in dir.GetFiles("*.*"))
{
filesList.Add(file.FullName, file.LastWriteTime);
}
}
#endregion
#region 解压缩文件
/// <summary>
/// 解压缩文件
/// </summary>
/// <param name="GzipFile">压缩包文件名</param>
/// <param name="targetPath">解压缩目标路径</param>
public static void Decompress(string GzipFile, string targetPath)
{
//string directoryName = Path.GetDirectoryName(targetPath + "//") + "//";
string directoryName = targetPath;
if (!Directory.Exists(directoryName)) Directory.CreateDirectory(directoryName);//生成解压目录
string CurrentDirectory = directoryName;
byte[] data = new byte[2048];
int size = 2048;
ZipEntry theEntry = null;
using (ZipInputStream s = new ZipInputStream(File.OpenRead(GzipFile)))
{
while ((theEntry = s.GetNextEntry()) != null)
{
if (theEntry.IsDirectory)
{// 该结点是目录
if (!Directory.Exists(CurrentDirectory + theEntry.Name)) Directory.CreateDirectory(CurrentDirectory + theEntry.Name);
}
else
{
if (theEntry.Name != String.Empty)
{
// 检查多级目录是否存在
if (theEntry.Name.Contains("//"))
{
string parentDirPath = theEntry.Name.Remove(theEntry.Name.LastIndexOf("//") + 1);
if (!Directory.Exists(parentDirPath))
{
Directory.CreateDirectory(CurrentDirectory + parentDirPath);
}
}
//解压文件到指定的目录
using (FileStream streamWriter = File.Create(CurrentDirectory + theEntry.Name))
{
while (true)
{
size = s.Read(data, 0, data.Length);
if (size <= 0) break;
streamWriter.Write(data, 0, size);
}
streamWriter.Close();
}
}
}
}
s.Close();
}
}
#endregion
}
}
这里是调用部分，
private void btn_Rar_Click(object sender, EventArgs e)
{
//我是先创建一个文本文件，然后压缩的,如果有现成的文件直接压缩，可以略过
//C#文件流写文件
string msg = DateTime.Now.ToString("yyyymmdd hhmmss") + "哈哈哈哈打不过我吧\n";
string pathfile = @"g:\1.txt";
string path=@"g:\";
string filename = DateTime.Now.ToString("yyyymmdd hhmmss")+".zip"; //这个扩展名可以自定义
byte[] myByte = System.Text.Encoding.UTF8.GetBytes(msg);
using (FileStream fsWrite = new FileStream(pathfile, FileMode.Append))//追加文本 FileMode.Append
{
fsWrite.Write(myByte, 0, myByte.Length);
};
//这里就是把文件放进一个list里，然后交给gzip这个类
List<FileInfo> listfile = new List<FileInfo>();
FileInfo info = new FileInfo(pathfile);
listfile.Add(info);
Gzip.CompressFile(listfile, path + filename, 1, false);
}