访问由单独线程创建的文件

发布于 2024-12-11 21:20:42 字数 801 浏览 0 评论 0原文

复制和访问文件时，我遇到多线程问题。

我有一个服务，它下载并解压 Zip 存档，然后将文件从解压缩的文件夹复制到正确的位置：

//Download, and uzip archive...

//Copy a needed file to its right location
File.Copy(fileName, fileDestination);

然后我启动一个单独的线程，需要访问复制的文件：

TheadPool.QueueUserWorkItem(s => processCopiedFile(fileDestination));

这是 ProcessCopiedFile 中的代码片段：

private void ProcessCopiedFile(string filePath)
{
    ...
    //Load the file, previously copied here
    var xml = XDocument.Load(filePath);
    ...
    //Do other work...
}

XDoument .Load 调用失败并出现异常：

The process cannot access the file <FileName> because it is used by another process.

似乎 File.Copy 保持结果文件锁定。当所有工作同步进行时，它不会出现错误。你有什么想法吗？谢谢。

原文

I have a problem aith multithreading when copying and accessing files.

I have a service, that downloads and unpacks a Zip archive, then it copies a file from unzipped folder to the right location:

//Download, and uzip archive...

//Copy a needed file to its right location
File.Copy(fileName, fileDestination);

Then I start a separate thread, that needs to access the copied files:

TheadPool.QueueUserWorkItem(s => processCopiedFile(fileDestination));

Here's the code fragment from ProcessCopiedFile:

private void ProcessCopiedFile(string filePath)
{
    ...
    //Load the file, previously copied here
    var xml = XDocument.Load(filePath);
    ...
    //Do other work...
}

The XDoument.Load call fails with exception:

The process cannot access the file <FileName> because it is used by another process.

Seems like File.Copy keeps the result file locked. When do all work synchronuously, it works without errors.
Have you any thoughts?
Thx.

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夏见 2024-12-18 21:20:42

File.Copy 不会保持任何打开或锁定的状态，它是一个原子操作，需要一些时间，当然取决于磁盘/网络 I/O 和文件大小。

当然，从同步转移到异步时，您应该确保在复制仍在进行时不会访问目标文件。

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花海 2024-12-18 21:20:42

使用流复制文件以避免 File.Copy 的 Windows 锁定

using(var s = new MemoryStream(File.ReadAllBytes(filePath))
{
    using(var fs = new FileStream(newLocation, FileMode.Create))
    {
        s.WriteTo(fs);
    }
}

Copy the file with a stream to avoid windows lock from File.Copy

using(var s = new MemoryStream(File.ReadAllBytes(filePath))
{
    using(var fs = new FileStream(newLocation, FileMode.Create))
    {
        s.WriteTo(fs);
    }
}

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