FileTarget.AutoFlush ignored

[Robert Važan]

I've tried to enable FileTarget.KeepFileOpen option with the expectation that FileTarget.AutoFlush will ensure that all messages are flushed to the file. The file however wasn't flushed, i.e. FileTarget.AutoFlush didn't do anything. Looking at the code, FileTarget.AutoFlush property is not referenced anywhere. Was it ever implemented?

Are there better ways to ensure flushing of log messages (even those before application crash) with less overhead that the default reopening of the file for every message?

It looks like this issue has been discussed some time ago:

http://nlog-forum.1685105.n2.nabble.com/keepFileOpen-true-on-lt-target-gt-td6831594.html

Was it ever fixed?

[Kim Christensen]

Could you post your configuration?

[Robert Važan]

             var fileTarget = new FileTarget()
            {
                FileName = file,
                Layout = layout,
                ConcurrentWrites = false,
                ArchiveAboveSize = 10000000,
                MaxArchiveFiles = 1000,
                KeepFileOpen = true,
                AutoFlush = true
            };

[Kim Christensen]

You are correct there are some inconsistency with file appenders and autoflush, i will look into this

[Eric Johnson]

I'm having a similar problem. I have a single process logging to file and per the File target documentation recommendations for best performance I am trying to set keepFileOpen=true and concurrentWrites=false. In this combination, however, NLog will not autoflush. If I switch the value on either attribute, autoflushing works. Referencing the earlier linked post, I have async=true set on the targets element, and setting it to false does not affect anything either.