How to configure NLog programmatically for Async target?

Question

I am trying to configure Nlog programmatically for use with async method. However it seems that the documentation mostly provides examples for configuration using XML. A minimal example using code for an older NLog version is provided here.

I would like to do that by using NLog.Config.LoggingConfiguration(), so here is how I proceeded:

var config = new NLog.Config.LoggingConfiguration();

// Targets:
NLog.Targets.FileTarget fileTarget = new NLog.Targets.FileTarget("fileTarget")
            {
                FileName = "\\MyLogFileDirectory.txt",
                ArchiveAboveSize = 25000000,
                MaxArchiveFiles = 10
            };

//Handle Async:
NLog.Targets.Wrappers.AsyncTargetWrapper asyncFileTarget = new NLog.Targets.Wrappers.AsyncTargetWrapper(fileTarget)
            {
                Name = fileTarget.Name,
                QueueLimit = 10,
                OverflowAction = NLog.Targets.Wrappers.AsyncTargetWrapperOverflowAction.Discard
            };
config.AddTarget(asyncFileTarget);

// Rules: 
config.AddRule(LogLevel.Info, LogLevel.Fatal, fileTarget, "MyLog");

NLog.LogManager.Configuration = config;

EDITS:

My question is the following: Does a separate Rule needs to be created for asyncFileTarget or is it enough to add the rule for fileTarget ?

Answer 1

It is important that the AddRule references the AsyncWrapper, else it will write directly to the target without buffering.

// Apply Async
NLog.Targets.Wrappers.AsyncTargetWrapper asyncFileTarget = new NLog.Targets.Wrappers.AsyncTargetWrapper(fileTarget)
{
   Name = fileTarget.Name,
   QueueLimit = 10,
   OverflowAction = NLog.Targets.Wrappers.AsyncTargetWrapperOverflowAction.Discard
};

// WriteTo Async
config.AddRule(LogLevel.Info, LogLevel.Fatal, asyncFileTarget, "MyLog");

Notice that AddRule internally automatically calls AddTarget