创建一个ZIP包会减慢速度 [英] Creating a ZIP package slows down

问题描述

我正在努力解决一个小问题，希望有人能对此有所启发.

问题是，当我使用ZipPackage -class创建Zip文件时，程序包本身已成功创建，但是在某些情况下，程序包的创建速度大大降低.

我可以使用相同的文件不断地重复该问题，但是我找不到原因.出现问题的文件集包含大量二进制文件，这些二进制文件已添加到zip，然后在末尾添加了一些文本文件.添加100个以上的二进制文件很顺利，但是最后添加文本文件时，创建速度变慢，因此将5 kB文本文件添加到程序包大约需要5秒钟.

到目前为止的观察结果:

• 文件数量似乎没有受到影响.如果首先添加了几个二进制文件，最后添加了文本文件，则会出现问题
• ，如果我颠倒了将文件添加到程序包中的顺序，则程序包的创建速度很快(文本文件首先，然后是二进制文件)
• 每个二进制文件为1-2 MB，大约添加了150个二进制文件.
• 仅添加了数百个二进制文件(最后没有文本文件)包装中的产品)表现出色
  

Hi,

I''m struggling with a small problem and I hope that someone could shed some light to it.

The problem is that when I create a Zip-file using ZipPackage-class, the package itself is created succesfully, but in some cases the creation of the package slows down dramatically.

I can repeat the problem constantly with the same files, but I haven''t been able find a reason for this. The problem occurs with a file set containing larger number of binary files added to the zip and then adding a few text files in the end. Adding 100+ binary files goes smoothly but in the end when the text files are added, the creation slows down so that adding a 5 kB text file to the package takes roughly 5 seconds.

Observations so far:




• the amount of files doesn''t seem to affect. If several binary files are added first and the text files in the end, the problem occurs
• if I reverse the order in which I add the files to the package, the creation of the package is fast (text files first, then binary files)
• each binary file is 1-2 MB and there is roughly 150 binary files added.
• just adding several hundred binary files (without text files in the end of the package) is performing excellent
  

System.Uri uri;
System.IO.Packaging.PackagePart part;

using (System.IO.Packaging.Package zip = System.IO.Packaging.ZipPackage.Open(zipFilename, System.IO.FileMode.OpenOrCreate)) {
   uri = System.IO.Packaging.PackUriHelper.CreatePartUri(new System.Uri(".\\" + new System.IO.FileInfo(fileToAdd).Name, System.UriKind.Relative));
   if (zip.PartExists(uri)) {
      zip.DeletePart(uri);
   }
   part = zip.CreatePart(uri, "", System.IO.Packaging.CompressionOption.Normal);
   using (System.IO.FileStream fileStream = new System.IO.FileStream(fileToAdd, System.IO.FileMode.Open, System.IO.FileAccess.Read, System.IO.FileShare.Read, 8192)) {
      using (System.IO.Stream dest = part.GetStream()) {
         fileStream.CopyTo(dest, 8192);
         dest.Close();
      }
      fileStream.Close();
   }


请注意，如果我调试应用程序，则



Note that if I debug the application, the


fileStream.Close();


是在花时间.因此，关闭阅读器流大约需要5秒钟.


is what is taking the time. So closing the reader stream is what takes ~5 seconds.

推荐答案

Mika，

希望这对您有所帮助:

在.NET 4.5中轻松创建Zip文件 [ ^ ]



谢谢，
Sunny K

Hi Mika,

Hope this may help you:

Creating Zip Files Easily in .NET 4.5[^]



Thanks,
Sunny K




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