c# - Cannot access a file in multi-thread -

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using (filestream fs = new filestream(path, filemode.append, fileaccess.write, fileshare.none)) {     using (streamwriter sw = new streamwriter(fs))     {         sw.writeline(datetime.now.tostring());              // multiple sw.writeline     } }

in spite of fact fileshare set "none", exception launched "the process cannot access file because being used process.
i'm in multi-thread context , file not written/read somewhere else.

why ?

you trying write file multiple threads - not possible without sort of synchronization ensure file closed before attempting write thread.

as fileshare set none - means multiple threads not allowed share file, of course sharing violation exception.

none - declines sharing of current file. request open file (by process or process) fail until file closed.


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