新增MyNotify.cs

[Target("YourFirst")]
public class MyNotify : TargetWithLayout
{
    protected override void InitializeTarget()
    {
        base.InitializeTarget();
    }
    protected override void Write(LogEventInfo logEvent)
    {
        Console.WriteLine("YourFirst: {0}", logEvent.Message);
    }
}

 編輯 NLog.config

<targets>
	<target name="myTarget" xsi:type="YourFirst" />
</targets>

<rules>
	<logger name="*" minlevel="Info" writeTo="myTarget" />
</rules>