Question

Hi i try use Nlog in with caliburn micro, I have use this tutorial http://buksbaum.us/2010/08/08/how-to-do-logging-with-caliburn-micro/.

Firstt I defined Nloagger class, here is it:

public class NLogLogger : ILog 
{ 
    #region Fields 

    private readonly NLog.Logger _innerLogger; 

    #endregion 

    #region Constructors 

    public NLogLogger(Type type) 
    { 
        _innerLogger = NLog.LogManager.GetLogger(type.Name); 
    } 
    #endregion 

   #region ILog Members 

    public void Error(Exception exception) 
    { 
        _innerLogger.ErrorException(exception.Message, exception); 
    } 

    public void Info(string format, params object[] args) 
    { 
        _innerLogger.Info(format, args); 
    } 

    public void Warn(string format, params object[] args) 
    { 
        _innerLogger.Warn(format, args); 
    } 
    #endregion

}

That I modified MEF bootraper:

#region Constructors

    public MefBootStrapper()
        : base()
    {
        _msgBox = new MessageBoxes();
        _doHandle = true;
    }

    static MefBootStrapper()
    {
        LogManager.GetLog = type => new NLogLogger(type);
    }


#endregion

and last modified app.config

<?xml version="1.0"?>

<configuration>

  <configSections>
    <section name="nlog" type="NLog.Config.ConfigSectionHandler, NLog"/>
  </configSections>

  <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="Error" writeTo="logfile" />
    </rules>
  </nlog>


</configuration>

It is really stupid for me but I dont know how to use now logger in View model class and second I would like to know if it is possible log with NLog to XML files.

Thank you for support

Answer 1

To use a logger, you need to ask for one. You can do this by requesting a logger instance in the Constructor (explicit) or property (implicit), or even ask the log manager to give it to you.

Here’s what you can do in your ViewModel:

public void MyViewModel 
{
    public MyViewModel()
    {
        Caliburn.Core.Logging.ILog logger = Caliburn.Core.Logging.LogManager.GetLog(typeof(MyViewModel));
        logger.Info("Something Happened");
    }
}

Alternatively you can inject a ILog instance (via constructor or property), if you have already registered one in the container you chose with Caliburn. I use Castle Windsor, so the registration part would look like this:

container.Register(Component.For<ILog>().ImplementedBy<NLogLogger>().LifeStyle.Transient);

And you can just ask for a logger in your constructor:

public void MyViewModel 
{
    public MyViewModel(ILog logger)
    {
        logger.Info("Something Happened");
    }
}