ASP.NET 打包下载文件

使用的类库为：ICSharpCode.SharpZipLib.dll

一种是打包整个文件夹，另一种是打包指定的多个文件，大同小异：

 using ICSharpCode.SharpZipLib.Zip;

 public partial class _Default : System.Web.UI.Page
 {
     protected void Page_Load(object sender, EventArgs e)
     {
         // 打包下载某文件夹里的所有文件

         //需要打包的文件夹
         string path = "UploadImage/Images/";
         string serverPath = Server.MapPath(path);

         //创建临时文件夹
         string tempName = DateTime.Now.ToString("yyyyMMddHHMMss");
         string tempFolder = Path.Combine(serverPath, tempName);
         Directory.CreateDirectory(tempFolder);

         //遍历文件夹中所有的文件到临时文件夹中
         DirectoryInfo folder = new DirectoryInfo(serverPath);
         foreach (FileInfo file in folder.GetFiles())
         {
             string filename = file.Name;
             File.Copy(serverPath + "/" + filename, tempFolder + "/" + filename);
         }

         //压缩文件
         compressFiles(tempFolder, tempFolder + "\\\\" + tempName + ".rar");
         //下载文件
         // DownloadRAR(tempFolder + "\\\\" + tempName + ".rar", "这里下载文件重命名后的名称");

         //某些文件打包下载
         DownLodeSum();

     }

     /// <summary>
     /// 某些文件打包下载
     /// </summary>
     public void DownLodeSum()
     {
         //临时文件夹所在目录
         string path = "UploadImage/";
         string serverPath = Server.MapPath(path);

         //创建临时文件夹
         string tempName = DateTime.Now.ToString("yyyyMMddHHMMss");
         string tempFolder = Path.Combine(serverPath, tempName);
         Directory.CreateDirectory(tempFolder);

         //复制需要压缩的文件到临时文件夹中
         File.Copy(Server.MapPath("UploadImage/Images/bg-b.png"), Server.MapPath(path + tempName + "/bg-b.png"));
         File.Copy(Server.MapPath("UploadImage/Images/bg-j.png"), Server.MapPath(path + tempName + "/bg-j.png"));
         File.Copy(Server.MapPath("UploadImage/Images/icon-cart.png"), Server.MapPath(path + tempName + "/icon-cart.png"));

         //压缩文件
         compressFiles(tempFolder, tempFolder + "\\\\" + tempName + ".rar");
         //下载文件
         DownloadRAR(tempFolder + "\\\\" + tempName + ".rar", "这里下载文件重命名后的名称");

     }

     /// <summary>
     /// 压缩文件
     /// </summary>
     /// <param name="dir">文件目录</param>
     /// <param name="zipfilename">zip文件名</param>
     public static void compressFiles(string dir, string zipfilename)
     {
         if (!Directory.Exists(dir))
         {
             return;
         }
         try
         {
             string[] filenames = Directory.GetFiles(dir);
             using (ZipOutputStream s = new ZipOutputStream(File.Create(zipfilename)))
             {

                 s.SetLevel(); // 0 - store only to 9 - means best compression

                 byte[] buffer = new byte[];

                 foreach (string file in filenames)
                 {
                     ZipEntry entry = new ZipEntry(Path.GetFileName(file));
                     entry.DateTime = DateTime.Now;
                     s.PutNextEntry(entry);
                     using (FileStream fs = File.OpenRead(file))
                     {
                         int sourceBytes;
                         do
                         {
                             sourceBytes = fs.Read(buffer, , buffer.Length);
                             s.Write(buffer, , sourceBytes);
                         } while (sourceBytes > );
                     }
                 }
                 s.Finish();
                 s.Close();
             }
         }
         catch
         {

         }
     }

     /// <summary>
     /// 下载生成的RAR文件
     /// </summary>
     private void DownloadRAR(string file, string name)
     {
         FileInfo fileInfo = new FileInfo(file);
         Response.Clear();
         Response.ClearContent();
         Response.ClearHeaders();
         Response.AddHeader("Content-Disposition", "attachment;filename=" + name + ".rar");
         Response.AddHeader("Content-Length", fileInfo.Length.ToString());
         Response.AddHeader("Content-Transfer-Encoding", "binary");
         Response.ContentType = "application/octet-stream";
         Response.ContentEncoding = System.Text.Encoding.GetEncoding("gb2312");
         Response.WriteFile(fileInfo.FullName);
         Response.Flush();
         string tempPath = file.Substring(, file.LastIndexOf("\\\\"));
         //删除临时目录下的所有文件
         DeleteFiles(tempPath);
         //删除空目录
         Directory.Delete(tempPath);
         Response.End();
     }

     /// <summary>
     /// 删除临时目录下的所有文件
     /// </summary>
     /// <param name="tempPath">临时目录路径</param>
     private void DeleteFiles(string tempPath)
     {
         DirectoryInfo directory = new DirectoryInfo(tempPath);
         try
         {
             foreach (FileInfo file in directory.GetFiles())
             {
                 if (file.Attributes.ToString().IndexOf("ReadOnly") != -)
                 {
                     file.Attributes = FileAttributes.Normal;
                 }
                 File.Delete(file.FullName);
             }
         }
         catch (Exception)
         {
             throw;
         }
     }
 }

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