How to get Child Class Name Instead of Base?

Question

I have a base class and using nlog logging. In my base class I have a method that gets passed in a logger object and then logs it to that logger.

When it logs it, logs it as the base class, I was hoping it would use the child class name.

<logger name="Uploads" minlevel="Debug" writeTo="Uploads" />


public void Child : Parent
{
    private readonly Logger logger = LogManager.GetLogger("Uploads")

    public void ParentMethod(Logger logger)
    {
            logger.Info("hi");
    }
}

Answer 1

You may use ${callsite} in the layout to determine the format of log message.

layout="${longdate}|${level:uppercase=true}|${callsite:includeNamespace=false:className=true:fileName=false:includeSourcePath=false:methodName=false}|${message}"

This will log messages in following format:

2018-03-15 18:11:43.1173|TRACE|{className}|{message}

Answer 2

The short answer is the NLog team considers this a breaking change so it hasn't been resolved yet. However, there are a couple workarounds that might work.

Workaround 1

Name the logger explicitly for each child class using GetType() and the Name property and pass it to GetLogger :

var logger = LogManager.GetLogger(GetType().Name);

Workaround 2

Create a custom sub-class logger .

Workaround 3

Add to the base class custom logging methods that automatically add the child class name using GetType().Name along with the message. Below is some example pseudocode:

public class BaseClass
{
    protected Logger logger = LogManager.GetLogger("BaseClass");
  
    protected void LogError(string message)
    {
        logger.Error($"{GetType().Name}: {message}");
    }

    protected void LogInfo(string message)
    {
        logger.Info($"{GetType().Name}: {message}");
    }
}