When does NLog capture the ThreadID?

[Chris Tracy]

If I have async logging turned on in nlog.config, where is the ThreadID captured?

Context: I'm starting a greenfield project using .NET, Rx, and TPL Dataflow (a.k.a. TDP). It will make heavy use of async operations and background work queues.

Goal: In my logging I'd like to capture the ManagedThreadId where the work is being performed, and when work is being done in parallel (easy to get wrong in Rx, where default scheduler isn't ThreadPool). If I have async logging turned on in nlog.config, where is the ThreadID captured?

Concern: I don't see ThreadID in the core LogEntry class for NLog. For example it isn't sent to the browser in cbley/NLog.SignalR. If I have async logging turned on in nlog.config, where is the ThreadIDcaptured? If it isn't captured until the log entry is rendered (in an NLog background thread), then theThreadId is useless to me and I need to find a more appropriate logging library.

P.S. Cross-Posted to StackOverflow.com  http://stackoverflow.com/questions/14585906/when-does-nlog-capture-the-threadid

[Jarek Kowalski]

ThreadID is being captured at the time of logging, but only when you actually use ${threadid} layout renderer.

Jarek

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[Chris Tracy]

I found [ThreadAgnostic] in NLog sources, and my understanding of NLog has just +1'ed.  This will be my first project making significant use of LogReceiverService, so the where & when of data capture is coming to the fore. 

Thanks.  Very helpful.

P.S.  I might ask another question regarding LogReceiverService and {threadid}, but enjoying the NLog sources enough that I'm going to keep reading for a while first.