NLog logging adapter for OWIN
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NLog logging adapter for OWIN!


There's a nuget package you can install this way:

Install-Package NLog.Owin.Logging

Currently there are dependencies on:

Target framework Dependencies
.NET 4.5 NLog (>=, Owin (>= 1.0)


To use the NLogAdapter with its default configuration:

using NLog.Owin.Logging;

public class Startup
	public void Configuration(IAppBuilder app)

The default translation table is:

TraceEventType NLog Loglevel
Critical Fatal
Error Error
Warning Warn
Information Info
Verbose Trace
Start Debug
Stop Debug
Suspend Debug
Resume Debug
Transfer Debug

If you'd like to customize this translation table you can supply a Func<TraceEventType, LogLevel> to the extension above.

using NLog.Owin.Logging;
using NLog;
using System.Diagnostics;

public class Startup
	public void Configuration(IAppBuilder app)
		// make a warning out of every log message!
		app.UseNLog((eventType) => LogLevel.Warn);

Note / Information

(Added in version 1.1) Any EventId passed to this Microsoft.Owin.Logging.ILogger.WriteCore() implementation is passed down to NLog in the log event's properties, and can be written to output by adding the matching line in the Log appender layout:


You can find more information about this topic in:

Help / Contribution

If you found a bug, please create an issue. Want to contribute? Create a pull request!