如何在C＃中异步打开文件 [英] How do I Open A File Asynchronously in C#

问题描述

即使在开始复制之前，异步执行文件打开的最佳方法是什么。我得到的例外是文件无法访问，因为它被另一个进程使用。我的代码如下所示：

What is the best way to execute file opening asynchronously even before copying begins. The exception I get is that the file is not accessible because its being used by another process.My code is shown below:

try
               {
                   using (var sourceStream = new FileStream(pathToDownloadedMedia, FileMode.Open, FileAccess.Read, FileShare.None, bufferSize: 4096, useAsync: true))
                   {
                       using (var destinationStream = File.Create(pathToProcessedMedia))
                       {
                           await sourceStream.CopyToAsync(destinationStream);
                       }
                   }
               }
               catch (Exception)
               {
                   throw new ApplicationException();
               }

推荐答案

使用 FileShare.None 你明确定义你得到的行为。



更好地使用 FileShare.ReadWrite ，看看会发生什么。< br $> b $ b

祝你好运。

By using FileShare.None you explicitly define the behaviour that you get.

Better use FileShare.ReadWrite and see what happens.

Good luck.

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