ASP.NET 檔案壓縮解壓類（C#）_實用技巧

本文執行個體講述了asp.net C#實現解壓縮檔案的方法，需要引用一個ICSharpCode.SharpZipLib.dll，供大家參考，具體如下：

using System;using System.Collections.Generic;using System.Linq;using System.Text;using ICSharpCode.SharpZipLib.Zip;using System.IO;using ICSharpCode.SharpZipLib.Checksums;using System.Web;namespace Mvc51Hiring.Common.Tool{  /// <summary> <br>  /// 作者：來自網格<br>  /// 修改人:sunkaixaun  /// 壓縮和解壓檔案   /// </summary>   public class ZipClass  {    /// <summary>     /// 所有檔案快取     /// </summary>     List<string> files = new List<string>();     /// <summary>     /// 所有空目錄緩衝     /// </summary>     List<string> paths = new List<string>();    /// <summary>     /// 壓縮單個檔案根據檔案地址    /// </summary>     /// <param name="fileToZip">要壓縮的檔案</param>     /// <param name="zipedFile">壓縮後的檔案全名</param>     /// <param name="compressionLevel">壓縮程度，範圍0-9，數值越大，壓縮程式越高</param>     /// <param name="blockSize">分塊大小</param>     public void ZipFile(string fileToZip, string zipedFile, int compressionLevel, int blockSize)    {      if (!System.IO.File.Exists(fileToZip))//如果檔案沒有找到，則報錯       {        throw new FileNotFoundException("The specified file " + fileToZip + " could not be found. Zipping aborderd");      }      FileStream streamToZip = new FileStream(fileToZip, FileMode.Open, FileAccess.Read);      FileStream zipFile = File.Create(zipedFile);      ZipOutputStream zipStream = new ZipOutputStream(zipFile);      ZipEntry zipEntry = new ZipEntry(fileToZip);      zipStream.PutNextEntry(zipEntry);      zipStream.SetLevel(compressionLevel);      byte[] buffer = new byte[blockSize];      int size = streamToZip.Read(buffer, 0, buffer.Length);      zipStream.Write(buffer, 0, size);      try      {        while (size < streamToZip.Length)        {          int sizeRead = streamToZip.Read(buffer, 0, buffer.Length);          zipStream.Write(buffer, 0, sizeRead);          size += sizeRead;        }      }      catch (Exception ex)      {        GC.Collect();        throw ex;      }      zipStream.Finish();      zipStream.Close();      streamToZip.Close();      GC.Collect();    }    /// <summary>     /// 壓縮目錄（包括子目錄及所有檔案）     /// </summary>     /// <param name="rootPath">要壓縮的根目錄</param>     /// <param name="destinationPath">儲存路徑</param>     /// <param name="compressLevel">壓縮程度，範圍0-9，數值越大，壓縮程式越高</param>     public void ZipFileFromDirectory(string rootPath, string destinationPath, int compressLevel)    {      GetAllDirectories(rootPath);      /* while (rootPath.LastIndexOf("\\") + 1 == rootPath.Length)//檢查路徑是否以"\"結尾       {        rootPath = rootPath.Substring(0, rootPath.Length - 1);//如果是則去掉末尾的"\"       }       */      //string rootMark = rootPath.Substring(0, rootPath.LastIndexOf("\\") + 1);//得到當前路徑的位置，以備壓縮時將所壓縮內容轉變成相對路徑。       string rootMark = rootPath + "\\";//得到當前路徑的位置，以備壓縮時將所壓縮內容轉變成相對路徑。       Crc32 crc = new Crc32();      ZipOutputStream outPutStream = new ZipOutputStream(File.Create(destinationPath));      outPutStream.SetLevel(compressLevel); // 0 - store only to 9 - means best compression       foreach (string file in files)      {        FileStream fileStream = File.OpenRead(file);//開啟壓縮檔         byte[] buffer = new byte[fileStream.Length];        fileStream.Read(buffer, 0, buffer.Length);        ZipEntry entry = new ZipEntry(file.Replace(rootMark, string.Empty));        entry.DateTime = DateTime.Now;        // set Size and the crc, because the information         // about the size and crc should be stored in the header         // if it is not set it is automatically written in the footer.         // (in this case size == crc == -1 in the header)         // Some ZIP programs have problems with zip files that don't store         // the size and crc in the header.         entry.Size = fileStream.Length;        fileStream.Close();        crc.Reset();        crc.Update(buffer);        entry.Crc = crc.Value;        outPutStream.PutNextEntry(entry);        outPutStream.Write(buffer, 0, buffer.Length);      }   this.files.Clear();    foreach (string emptyPath in paths)      {        ZipEntry entry = new ZipEntry(emptyPath.Replace(rootMark, string.Empty) + "/");        outPutStream.PutNextEntry(entry);      }      this.paths.Clear();      outPutStream.Finish();      outPutStream.Close();      GC.Collect();    }    /// <summary>     /// 多檔案打包下載    /// </summary>     public void DwonloadZip(string[] filePathList, string zipName)    {      MemoryStream ms = new MemoryStream();      byte[] buffer = null;      var context = HttpContext.Current;      using (ICSharpCode.SharpZipLib.Zip.ZipFile file = ICSharpCode.SharpZipLib.Zip.ZipFile.Create(ms))      {        file.BeginUpdate();        file.NameTransform = new MyNameTransfom();//通過這個名稱格式化器，可以將裡面的檔案名稱進行一些處理。預設情況下，會自動根據檔案的路徑在zip中建立有關的檔案夾。        foreach (var it in filePathList)        {          file.Add(context.Server.MapPath(it));        }        file.CommitUpdate();        buffer = new byte[ms.Length];        ms.Position = 0;        ms.Read(buffer, 0, buffer.Length);      }      context.Response.AddHeader("content-disposition", "attachment;filename=" + zipName);      context.Response.BinaryWrite(buffer);      context.Response.Flush();      context.Response.End();    }    /// <summary>     /// 取得目錄下所有檔案及檔案夾，分別存入files及paths     /// </summary>     /// <param name="rootPath">根目錄</param>     private void GetAllDirectories(string rootPath)    {      string[] subPaths = Directory.GetDirectories(rootPath);//得到所有子目錄       foreach (string path in subPaths)      {        GetAllDirectories(path);//對每一個字目錄做與根目錄相同的操作：即找到子目錄並將目前的目錄的檔案名稱存入List       }      string[] files = Directory.GetFiles(rootPath);      foreach (string file in files)      {        this.files.Add(file);//將目前的目錄中的所有檔案全名存入檔案List       }      if (subPaths.Length == files.Length && files.Length == 0)//如果是空目錄       {        this.paths.Add(rootPath);//記錄空目錄       }    }    /// <summary>     /// 解壓縮檔案(壓縮檔中含有子目錄)     /// </summary>     /// <param name="zipfilepath">待解壓縮的檔案路徑</param>     /// <param name="unzippath">解壓縮到指定目錄</param>     /// <returns>解壓後的檔案清單</returns>     public List<string> UnZip(string zipfilepath, string unzippath)    {      //解壓出來的檔案清單       List<string> unzipFiles = new List<string>();      //檢查輸出目錄是否以“\\”結尾       if (unzippath.EndsWith("\\") == false || unzippath.EndsWith(":\\") == false)      {        unzippath += "\\";      }      ZipInputStream s = new ZipInputStream(File.OpenRead(zipfilepath));      ZipEntry theEntry;      while ((theEntry = s.GetNextEntry()) != null)      {        string directoryName = Path.GetDirectoryName(unzippath);        string fileName = Path.GetFileName(theEntry.Name);         //產生解壓目錄【使用者解壓到硬碟根目錄時，不需要建立】         if (!string.IsNullOrEmpty(directoryName))        {          Directory.CreateDirectory(directoryName);        }        if (fileName != String.Empty)        {          //如果檔案的壓縮後大小為0那麼說明這個檔案是空的,因此不需要進行讀出寫入           if (theEntry.CompressedSize == 0)            break;          //解壓檔案到指定的目錄           directoryName = Path.GetDirectoryName(unzippath + theEntry.Name);          //建立下面的目錄和子目錄           Directory.CreateDirectory(directoryName);         //記錄匯出的檔案           unzipFiles.Add(unzippath + theEntry.Name);         FileStream streamWriter = File.Create(unzippath + theEntry.Name);          int size = 2048;          byte[] data = new byte[2048];          while (true)          {            size = s.Read(data, 0, data.Length);            if (size > 0)            {              streamWriter.Write(data, 0, size);            }            else            {              break;            }          }          streamWriter.Close();        }      }      s.Close();      GC.Collect();      return unzipFiles;    }  }  public class MyNameTransfom : ICSharpCode.SharpZipLib.Core.INameTransform  {    #region INameTransform 成員    public string TransformDirectory(string name)    {      return null;    }    public string TransformFile(string name)    {      return Path.GetFileName(name);    }    #endregion  }} 

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