如何测试文件是否在 .NET 中完全复制 [英] How to test if a file is fully copied in .NET

问题描述

我正在监视一个文件夹中的新文件并且需要处理它们.问题是偶尔文件打开失败，因为系统还没有完成复制.

I am monitoring a folder for new files and need to process them. The problem is that occasionally file opening fails, because system has not finished copying it.

测试文件是否完成复制的正确方法是什么?

What is the correct way to test if the file is finished copying?

澄清:我没有文件夹/文件的写入权限，也无法控制复制过程(是用户).

Clarification: I don't have write permissions to the folder/files and cannot control the copying process (it's the user).

推荐答案

我认为唯一可靠的方法是尝试以独占方式打开文件并捕获特定异常.我通常讨厌对正常的应用程序逻辑使用异常，但我担心这种情况没有其他方法(至少我还没有找到):

I think the only sure way to do this is by trying to open the file exclusively and catching a specific exception. I usually hate using exceptions for normal application logic, but I'm afraid for this scenario there's no other way (at least I haven't found one yet):

public bool FileIsDone(string path)
{
  try
  {
    using (File.Open(path, FileMode.Open, FileAccess.Read, FileShare.None))
    {
    }
  }
  catch(UnauthorizedAccessException)
  {
    return false;
  }

  return true;
}

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