I've used NLog on a few console apps without any issue but this is the first time I've used it on an MVC web application. When I try to log to a file nothing happens. There are no errors nor are any log files created. When I step through the app locally I don't get any errors either.
First thing I did was confirm that my NLog.config file's property was set to “Copy always” in the “Copy to Output” property. I even uninstalled NLog through NuGet and then installed it again as well as closed VS and opened up the project again.
I've done some searching and the only real suggestions I found were to create the folder location first and then check the permissions on the app pool. I created the folder location but that didn't seem to work either. I'm running this through Debug mode in Visual Studio 2015 which automatically fires up a local web server so I don't know how to find out what service it's using to write to the file location.
In the example below I can put a break point on my ActionResult inside my controller and see a value being passed in the “gate” parameter. I step though to my test of the logger and don't get any errors. I look in my log location and no log file is created.
Anyone have any suggestions on what I can try?
NLog.config 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"
autoReload="true"
throwExceptions="true">
<variable name="LogDirBase" value="D:/logs/RampInfo"/>
<variable name="LogYear" value="${date:format=yyy}"/>
<variable name="LogMonth" value="${date:format=MM}"/>
<variable name="LogDay" value="${date:format=dd}"/>
<variable name="LogFileShortDate" value="${date:format=yyyy-MM-dd}"/>
<targets>
<target name="DefaultTarget"
xsi:type="File"
fileName="${LogDirBase}/${LogFileShortDate}.log"
encoding="utf-8"
layout="${longdate} | ${callsite} | ${message}"
maxArchiveFiles="14"
/>
</targets>
<rules>
<logger name="defaultLogger" minlevel="Debug" writeTo="DefaultTarget" />
</rules>
</nlog>
My Controller
public class RampController : Controller
{
private static Logger logger = LogManager.GetCurrentClassLogger();
// GET: GateInfo
public ActionResult Gate(string gate)
{
logger.Debug("Start action result. Gate: " + gate);
}
Logger names typically use something like this
<logger name="Name.Space.RampController" minlevel="Debug" writeTo="DefaultTarget" />
or, if you just want a single log file for your application:
<logger name="*" minlevel="Debug" writeTo="DefaultTarget" />
Internally, LogManager.GetCurrentClassLogger
looks at the current Stack to determine the calling type: (silverlight conditionals removed):
public new T GetCurrentClassLogger()
{
StackFrame frame = new StackFrame(1, false);
return this.GetLogger(frame.GetMethod().DeclaringType.FullName);
}
I appreciate everyone's suggestions. I spent hours trying to figure out why the NLog wasn't working. I gave up for the day and came back to it this morning with a fresh mind. I basically started over with a whole new NLog.config and that worked. I copied out of different project a different NLog configuration. I don't really see the difference between the two but either way it's now working as expected.
Here is the new NLog.config I went with.
<nlog xmlns="http://www.nlog-project.org/schemas/NLog.xsd"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
autoReload="true"
throwExceptions="true">
<variable name="LogDirectory" value="D:\integration\logs\RampInfo"/>
<targets>
<target name="LogTarget"
xsi:type="File"
fileName="${LogDirectory}/${shortdate}.log"
encoding="utf-8"
maxArchiveFiles="14"
layout="${longdate} ${callsite} ${message}" />
</targets>
<rules>
<logger name="*" minlevel="Debug" writeTo="LogTarget" />
</rules>
</nlog>
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