How does one use FileStream to append to a file without an exclusive lock?
15,995
See this question: C# file read/write fileshare doesn’t appear to work
In short, your freader has to specify FileShare.Write to allow for the fact that there is already a writer on the file.
Comments
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Neil C. Obremski almost 2 years
What I'm trying to do with
FileStream
in 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 writer stream to open the file in non-exlusive locking mode and thus the code always throws an exception:The process cannot access the file 'C:\test.txt' because it is being used by another process.
Here's a smattering of code which demonstrates the issue:
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);
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Neil C. Obremski over 15 yearsYeah, if I could only figure out how to get a MemoryStream to act more like a connection. Of course I'm still having just as much trouble with FileStream so I may ask another question to that effect.