CODEWITHSUNDEEP
c#nlog
David
David

Reputation: 1058

I need to change the layout for different uses

I need to change the layout of my log file when writing log entries from an aspect. I will likely need to change other settings as well in time.

I have created two FileTargets that create the layout as I require.

    LoggingConfiguration config = new LoggingConfiguration();
    LoggingConfiguration aspectConfig = new LoggingConfiguration();

    FileTarget fileTarget = new FileTarget();
    fileTarget.Name = "fileTarget";
    fileTarget.Layout = "${longdate} ${machineName} ${callsite} ${message} ${exception:format=tostring}";
    fileTarget.FileName = String.Format("{0}Admin.log", Config.DatabasePath);
    fileTarget.KeepFileOpen = false;


    FileTarget aspectTarget = new FileTarget();
    aspectTarget.Name = "aspectTarget";
    aspectTarget.Layout = "${longdate} ${machineName} ${message} ${exception:format=tostring}";
    aspectTarget.FileName = String.Format("{0}Admin.log", Config.DatabasePath);
    aspectTarget.KeepFileOpen = false;


    LoggingRule rule2 = new LoggingRule("*", LogLevel.Trace, fileTarget);
    config.LoggingRules.Add(rule2);

    LoggingRule aspectRule = new LoggingRule("aspects", LogLevel.Trace, aspectTarget);
    aspectConfig.LoggingRules.Add(aspectRule);


    LogManager.Configuration = config;

There may be other changes/differences to come but that is besides the point at this stage.

Using the following works fine for the 'default or '*' config ie by using :

  var log = LogManager.GetCurrentClassLogger();
  log.Fatal("##########################################");

What I want to do is be able to use the 'aspectRule' rather than the default '*' rule by calling logger and specifying the 'aspectRule'.

I had thought this would work:

  var log = LogManager.GetLogger("aspects");
  log.Fatal("########################################");

which is all well and good but I can't see how I define a new Logger called 'aspects' particularly as in code I don't even create a Logger called '*' :-)

Note that I am not using an XML config file and need a solution to use programatically.

Any ideas?

EDIT:

I need to write 1 log entry as in this example:

  if (someCondition)
    logger.Fatal("#############"); // use layout in fileTarget
  else
    logger.Fatal("##############");  // use layout in aspectTarget

Upvotes: 0

Views: 170

Answers (1)

AVIDeveloper
AVIDeveloper

Reputation: 3496

EDIT: To answer your edited question, LoggingRule rule2 = new LoggingRule("*", LogLevel.Trace, fileTarget) will log any output to the log file.

If you want a specific output then you'll have to be specific with NLog. For example, log anything ranging from Trace up to Info with a fileTarget ("*"), and have two other specific targets aspects and rule2 with log levels from Error to Fatal.

Then you could log like this:

LogManager.GetCurrentClassLogger().Debug( "Non-specific message" );
LogManager.GetLogger( "rule2" ).Fatal( "From rule2" );
LogManager.GetLogger( "aspects" ).Fatal( "From Aspects" );

--

You're creating two configurations config and aspectConfig, setting up both and eventually setting LogManager.Configuration = config.

Eventually aspectConfig is not being used. To resolve, remove all aspectConfig related code and fix the acpects line to this:

config.LoggingRules.Add(aspectRule);

Upvotes: 2

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