NLog OnNewLogFile Handler?

问题

Is there any event handler or similar that I can hook into, to run some code every time NLog starts a new Log File?

I have an NLog Config like this:

    <target name="logfile" xsi:type="File"
            fileName="[stuff]"
            layout="[more Stuff]"
            maxArchiveFiles="4"
            archiveAboveSize="102400"  />

And I'd kinda like to add some meta-data at the start of every log file (version number, Machine Name, etc. so that every log file comes complete with some contextual information)

I don't expect to be able to configure this text in NLog itself, but I'm hoping that I can tell NLog to run a certain method everytime it's going to create a new Log File.

Is this a thing?

回答1:

Sounds like you are really looking for the Header-Layout on the FileTarget.

<target name="logfile" xsi:type="File">
         <header>--- ${assembly-version} started on ${longdate} ---</header>
</target>

See also https://github.com/NLog/NLog/wiki/File-target

Some combine it with archiveOldFileOnStartup="true" because the Header is only printed when file is created (ensure application restarts will create new file).

回答2:

You can use FileSystemWatcher.

FileSystemWatcher is watching specific (which you want it) directory, If new file created, handle this event with FileSystemWatcher

For more details : https://docs.microsoft.com/en-us/dotnet/api/system.io.filesystemwatcher?view=netframework-4.8

回答3:

Another partial solution to the "What version?" aspect of this problem could come from:

https://github.com/NLog/NLog/wiki/AssemblyVersion-Layout-Renderer

来源：https://stackoverflow.com/questions/60335551/nlog-onnewlogfile-handler

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