Logging With NLog In Azure WebJobs

Question

I've got an NLog configuration which works just fine for my web app (ASP.NET Core). Now I'm trying to add NLog to my webjobs, but I can't figure out how to do it.

In Program.cs within the webjob project, I need to somehow inject IHostingEnvironment and ILoggerFactory (Both of which I inject into the StartUp constructor of the web app). Once I know how to do that, I should be able to finish off the configuration.

If that's not possible, what alternatives do I have?

I'm not keen to use the TextWriter class passed into the webjob methods, as I imagine it would be difficult to extract the logs and route them to where I ultimately want it to go.

score 0 · Accepted Answer · answered Jul 28 '17 at 02:43

Following are steps of using NLog in WebJob.

Step 1, install NLog.Config package for your WebJob.

Install-Package NLog.Config

Step 2, add rules and targets to NLog.config files. Following is the sample of writing logs to a file.

<?xml version="1.0" encoding="utf-8" ?>
<nlog xmlns="http://www.nlog-project.org/schemas/NLog.xsd"
      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <targets>
    <target name="logfile" xsi:type="File" fileName="file.txt" />
  </targets>
  <rules>
    <logger name="*" minlevel="Info" writeTo="logfile" />
  </rules>
</nlog>

Step 3, get logger instance using LogManager class.

private static Logger logger = LogManager.GetLogger("MyLog");

Step 4, after got the logger instance, you could write log using following code.

logger.Trace("Sample trace message");
logger.Debug("Sample debug message");

Does this work for anyone? I don't see any files created. Maybe it's because I have a .NET core app. — David De Sloovere, Feb 03 '18 at 12:13
This is just to write to some file but we need to write to `TextWriter` passed to functions of WebJobs. Down voting this — Artyom, Mar 23 '18 at 14:06

Logging With NLog In Azure WebJobs

1 Answers1