C#实现Zip压缩解压实例

 本文只列举一个压缩帮助类，使用的是有要添加一个dll引用ICSharpCode.SharpZipLib.dll。另外说明一下的是，这个类压缩格式是ZIP的，所以文件的后缀写成 .zip

还有，如果用这个类来解压rar格式的压缩文件时会报错，就网上说的那个"Wrong Local header signature: 0x21726152"异常。只要解压ZIP压缩格式的压缩文件就不会报错了。 下面就是Helper类的代码

using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
 using System.IO;
 using ICSharpCode.SharpZipLib;
 using ICSharpCode.SharpZipLib.Zip;
 using ICSharpCode.SharpZipLib.Checksums;

 namespace MyHelpers.Helpers
 {
     /// <summary>
     /// 适用与ZIP压缩
     /// </summary>
     public class ZipHelper
     {
         #region 压缩

         /// <summary>
         /// 递归压缩文件夹的内部方法
         /// </summary>
         /// <param name="folderToZip">要压缩的文件夹路径</param>
         /// <param name="zipStream">压缩输出流</param>
         /// <param name="parentFolderName">此文件夹的上级文件夹</param>
         /// <returns></returns>
         private static bool ZipDirectory(string folderToZip, ZipOutputStream zipStream, string parentFolderName)
         {
             bool result = true;
             string [] folders, files;
             ZipEntry ent = null;
             FileStream fs = null;
             Crc32 crc = new Crc32();

             try
             {
                 ent = new ZipEntry(Path.Combine(parentFolderName, Path.GetFileName(folderToZip) + "/"));
                 zipStream.PutNextEntry(ent);
                 zipStream.Flush();

                 files = Directory.GetFiles(folderToZip);
                 foreach (string file in files)
                 {
                     fs = File.OpenRead(file);

                     byte[] buffer = new byte[fs.Length];
                     fs.Read(buffer, 0, buffer.Length);
                     ent = new ZipEntry(Path.Combine(parentFolderName, Path.GetFileName(folderToZip) + "/" + Path.GetFileName(file)));
                     ent.DateTime = DateTime.Now;
                     ent.Size = fs.Length;

                     fs.Close();

                     crc.Reset();
                     crc.Update(buffer);

                     ent.Crc = crc.Value;
                     zipStream.PutNextEntry(ent);
                     zipStream.Write(buffer, 0, buffer.Length);
                 }

             }
             catch
             {
                 result = false;
             }
             finally
             {
                 if (fs != null)
                 {
                     fs.Close();
                     fs.Dispose();
                 }
                 if (ent != null)
                 {
                     ent = null;
                 }
                 GC.Collect();
                 GC.Collect(1);
             }

             folders = Directory.GetDirectories(folderToZip);
             foreach (string folder in folders)
                 if (!ZipDirectory(folder, zipStream, folderToZip))
                     return false;

             return result;
         }

         /// <summary>
         /// 压缩文件夹
         /// </summary>
         /// <param name="folderToZip">要压缩的文件夹路径</param>
         /// <param name="zipedFile">压缩文件完整路径</param>
         /// <param name="password">密码</param>
         /// <returns>是否压缩成功</returns>
         public static bool ZipDirectory(string folderToZip, string zipedFile, string password)
         {
             bool result = false;
             if (!Directory.Exists(folderToZip))
                 return result;

             ZipOutputStream zipStream = new ZipOutputStream(File.Create(zipedFile));
             zipStream.SetLevel(6);
             if (!string.IsNullOrEmpty(password)) zipStream.Password = password;

             result = ZipDirectory(folderToZip, zipStream, "");

             zipStream.Finish();
             zipStream.Close();

             return result;
         }

         /// <summary>
         /// 压缩文件夹
         /// </summary>
         /// <param name="folderToZip">要压缩的文件夹路径</param>
         /// <param name="zipedFile">压缩文件完整路径</param>
         /// <returns>是否压缩成功</returns>
         public static bool ZipDirectory(string folderToZip, string zipedFile)
         {
             bool result = ZipDirectory(folderToZip, zipedFile, null);
             return result;
         }

         /// <summary>
         /// 压缩文件
         /// </summary>
         /// <param name="fileToZip">要压缩的文件全名</param>
         /// <param name="zipedFile">压缩后的文件名</param>
         /// <param name="password">密码</param>
         /// <returns>压缩结果</returns>
         public static bool ZipFile(string fileToZip, string zipedFile, string password)
         {
             bool result = true;
             ZipOutputStream zipStream=null;
             FileStream fs = null;
             ZipEntry ent = null;

             if (!File.Exists(fileToZip))
                 return false;

             try
             {
                 fs = File.OpenRead(fileToZip);
                 byte[] buffer = new byte[fs.Length];
                 fs.Read(buffer, 0, buffer.Length);
                 fs.Close();

                 fs = File.Create(zipedFile);
                 zipStream = new ZipOutputStream(fs);
                 if (!string.IsNullOrEmpty(password)) zipStream.Password = password;
                 ent = new ZipEntry(Path.GetFileName(fileToZip));
                 zipStream.PutNextEntry(ent);
                 zipStream.SetLevel(6);

                 zipStream.Write(buffer, 0, buffer.Length);

             }
             catch
             {
                 result = false;
             }
             finally
             {
                 if (zipStream != null)
                 {
                     zipStream.Finish();
                     zipStream.Close();
                 }
                 if (ent != null)
                 {
                     ent = null;
                 }
                 if (fs != null)
                 {
                     fs.Close();
                     fs.Dispose();
                 }
             }
             GC.Collect();
             GC.Collect(1);

             return result;
         }

         /// <summary>
         /// 压缩文件
         /// </summary>
         /// <param name="fileToZip">要压缩的文件全名</param>
         /// <param name="zipedFile">压缩后的文件名</param>
         /// <returns>压缩结果</returns>
         public static bool ZipFile(string fileToZip, string zipedFile)
         {
             bool result = ZipFile(fileToZip, zipedFile,null);
             return result;
         }

         /// <summary>
         /// 压缩文件或文件夹
         /// </summary>
         /// <param name="fileToZip">要压缩的路径</param>
         /// <param name="zipedFile">压缩后的文件名</param>
         /// <param name="password">密码</param>
         /// <returns>压缩结果</returns>
         public static bool Zip(string fileToZip, string zipedFile, string password)
         {
             bool result = false;
             if (Directory.Exists(fileToZip))
                 result = ZipDirectory(fileToZip, zipedFile, password);
             else if (File.Exists(fileToZip))
                 result = ZipFile(fileToZip, zipedFile,password);

             return result;
         }

         /// <summary>
         /// 压缩文件或文件夹
         /// </summary>
         /// <param name="fileToZip">要压缩的路径</param>
         /// <param name="zipedFile">压缩后的文件名</param>
         /// <returns>压缩结果</returns>
         public static bool Zip(string fileToZip, string zipedFile)
         {
             bool result = Zip(fileToZip, zipedFile,null);
             return result;

         }

         #endregion

         #region 解压

         /// <summary>
         /// 解压功能(解压压缩文件到指定目录)
         /// </summary>
         /// <param name="fileToUnZip">待解压的文件</param>
         /// <param name="zipedFolder">指定解压目标目录</param>
         /// <param name="password">密码</param>
         /// <returns>解压结果</returns>
         public static bool UnZip(string fileToUnZip, string zipedFolder, string password)
         {
             bool result = true;
             FileStream fs = null;
             ZipInputStream zipStream = null;
             ZipEntry ent = null;
             string fileName;

             if (!File.Exists(fileToUnZip))
                 return false;

             if (!Directory.Exists(zipedFolder))
                 Directory.CreateDirectory(zipedFolder);

             try
             {
                 zipStream=new ZipInputStream(File.OpenRead(fileToUnZip));
                 if(!string.IsNullOrEmpty(password))zipStream.Password=password;
                 while ((ent=zipStream.GetNextEntry())!=null)
                 {
                     if (!string.IsNullOrEmpty(ent.Name))
                     {
                         fileName = Path.Combine(zipedFolder, ent.Name);
                         fileName = fileName.Replace('/', '\');//change by Mr.HopeGi

                         if (fileName.EndsWith("\"))
                         {
                             Directory.CreateDirectory(fileName);
                             continue;
                         }

                         fs = File.Create(fileName);
                         int size = 2048;
                         byte[] data = new byte[size];
                         while (true)
                         {
                             size = fs.Read(data, 0, data.Length);
                             if (size > 0)
                                 fs.Write(data, 0, data.Length);
                             else
                                 break;
                         }
                     }
                 }
             }
             catch
             {
                 result = false;
             }
             finally
             {
                 if (fs != null)
                 {
                     fs.Close();
                     fs.Dispose();
                 }
                 if (zipStream != null)
                 {
                     zipStream.Close();
                     zipStream.Dispose();
                 }
                 if(ent!=null)
                 {
                     ent = null;
                 }
                 GC.Collect();
                 GC.Collect(1);
             }
             return result;
         }

         /// <summary>
         /// 解压功能(解压压缩文件到指定目录)
         /// </summary>
         /// <param name="fileToUnZip">待解压的文件</param>
         /// <param name="zipedFolder">指定解压目标目录</param>
         /// <returns>解压结果</returns>
         public static bool UnZip(string fileToUnZip, string zipedFolder)
         {
             bool result = UnZip(fileToUnZip, zipedFolder,null);
             return result;
         }

         #endregion
     }
 }