File.Copy之后，另一个进程正在使用该文件 [英] File is being used by another process after File.Copy

问题描述

我试图在我的web应用程序中管理文件。有时，我必须在一个文件夹（使用File.Copy）创建一个文件：

  File.Copy（@oldPath，@newPath ）; 
  

几秒钟后，该文件可能会被删除：

$ b如果（File.Exists（@newPath））{
File.Delete（@newPath）; $ b

  
} 
  

但是，我不知道为什么新文件仍然被服务器阻塞进程（IIS，w3wp.exe）后File.Copy。在File.Delete之后，我得到这个异常：

lockquote

进程无法访问文件，因为它被
使用另一个进程。b


根据Api，File.Copy不会阻止文件，是吗？

我试图释放资源，但没有奏效。如何解决这个问题？

更新：确实，使用Process Explorer的文件被IIS进程阻止。我试图实现复制代码，以手动释放资源，但问题仍然存在：

  public void copy String oldPath，String newPath）
 {
 FileStream input = null; 
 FileStream输出= null; 
尝试
 {
 input = new FileStream（oldPath，FileMode.Open）; 
 output = new FileStream（newPath，FileMode.Create，FileAccess.ReadWrite）; 
 
 byte [] buffer = new byte [32768]; 
 int读取; （（read = input.Read（buffer，0，buffer.Length））> 0）
（
 output.Write（buffer，0，read）; 
 
 $ b $ catch（Exception e）
 {
} 
 finally 
 {
 input.Close（）; 
 input.Dispose（）; 
 output.Close（）; 
 output.Dispose（）; 
 
 
 
 $ div $解析方案

被另一个进程阻塞，而我没有意识到这一点。 Process Explorer确实有帮助。





典型的简单问题难以发现。

I am trying to manage files in my web application. Sometimes, I must create a file in a folder (with File.Copy):

File.Copy(@oldPath, @newPath);

And a few seconds later that file may be deleted:

if (File.Exists(@newPath)) {
  File.Delete(@newPath);            
}

However, I don't know why the new file remains blocked by the server process (IIS, w3wp.exe) after File.Copy. After File.Delete I get the exception:

"The process cannot access the file because it is being used by another process."

According to the Api, File.Copy don't block the file, does it?

I have tried to release the resources but it hasn't worked. How can I resolve this?

UPDATED: Indeed, using Process Explorer the file is blocked by IIS process. I have tried to implement the copy code in order to release manually the resources but the problem still goes on:

  public void copy(String oldPath, String newPath)
  {
    FileStream input = null;
    FileStream output = null;
    try
    {
      input = new FileStream(oldPath, FileMode.Open);
      output = new FileStream(newPath, FileMode.Create, FileAccess.ReadWrite);

      byte[] buffer = new byte[32768];
      int read;
      while ((read = input.Read(buffer, 0, buffer.Length)) > 0)
      {
        output.Write(buffer, 0, read);
      }
    }
    catch (Exception e)
    {
    }
    finally
    {
      input.Close();
      input.Dispose();
      output.Close();
      output.Dispose();
    }
  }

解决方案

File was being blocked by another process without me being aware of it. Process Explorer was really helpful.

Typical easy issue hard to spot.

这篇关于File.Copy之后，另一个进程正在使用该文件的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！