C# 如何使用 FileStream 附加到没有排他锁的文件？
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How does one use FileStream to append to a file without an exclusive lock?
提问by Neil C. Obremski
What I'm trying to do with FileStreamin C#/.NET is to open two streams: one appending to a file and the other reading those writes asynchronously (for unit testing some network connection handling code). I can't figure out how to get the writerstream to open the file in non-exlusive locking mode and thus the code always throws an exception:
我试图FileStream在 C#/.NET 中做的是打开两个流：一个附加到文件，另一个异步读取这些写入（用于单元测试一些网络连接处理代码）。我无法弄清楚如何让作家流开在非EXLUSIVE锁定模式的文件，因此代码总是抛出一个异常：
The process cannot access the file 'C:\test.txt' because it is being used by another process.
该进程无法访问文件“C:\test.txt”，因为它正被另一个进程使用。
Here's a smattering of code which demonstrates the issue:
下面是一些演示问题的代码：
FileStream fwriter = new FileStream("C:\test.txt", FileMode.Append,
FileAccess.Write, FileShare.Read);
FileStream freader = new FileStream("C:\test.txt", FileMode.Open,
FileAccess.Read, FileShare.Read);
采纳答案by Rob Walker
See this question: C# file read/write fileshare doesn't appear to work
看到这个问题：C# 文件读/写文件共享似乎不起作用
In short, your freader has to specify FileShare.Write to allow for the fact that there is already a writer on the file.
简而言之，您的 freader 必须指定 FileShare.Write 以允许文件上已经有一个 writer 的事实。
回答by Grzenio
I am not sure if it helps, but if you are only unit testing, wouldn't it be easier to use a memory stream instead of files?
我不确定它是否有帮助，但是如果您只是进行单元测试，那么使用内存流而不是文件不是更容易吗？
