AsyncTargetWrapper Class

public class AsyncTargetWrapper : WrapperTargetBase

Public Class AsyncTargetWrapper
	Inherits WrapperTargetBase

Dim instance As AsyncTargetWrapper

type AsyncTargetWrapper =  
    class
        inherit WrapperTargetBase
    end

1<targets async="true">
2   ... your targets go here ...
3</targets>

 1<?xml version="1.0" ?>
 2<nlog xmlns="http://www.nlog-project.org/schemas/NLog.xsd"
 3      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
 4    <targets>
 5        <!-- Log in a separate thread, possibly queueing up to
 6        5000 messages. When the queue overflows, discard any
 7        extra messages-->
 8
 9        <target name="file" xsi:type="AsyncWrapper" queueLimit="5000" overflowAction="Discard">
10            <target xsi:type="File" fileName="${basedir}/logs/${level}.txt" />
11        </target>
12    </targets>
13
14    <rules>
15        <logger name="*" minlevel="Debug" writeTo="file" />
16    </rules>
17</nlog>

 1using NLog;
 2using NLog.Targets;
 3using NLog.Targets.Wrappers;
 4using System.Text;
 5
 6class Example
 7{
 8    static void Main(string[] args)
 9    {
10        FileTarget target = new FileTarget();
11        target.Layout = "${longdate} ${logger} ${message}";
12        target.FileName = "${basedir}/logs/logfile.txt";
13        target.KeepFileOpen = false;
14        target.Encoding = Encoding.UTF8;
15
16        AsyncTargetWrapper wrapper = new AsyncTargetWrapper();
17        wrapper.WrappedTarget = target;
18        wrapper.QueueLimit = 5000;
19        wrapper.OverflowAction = AsyncTargetWrapperOverflowAction.Discard;
20
21        NLog.Config.SimpleConfigurator.ConfigureForTargetLogging(wrapper, LogLevel.Debug);
22
23        Logger logger = LogManager.GetLogger("Example");
24        logger.Debug("log message");
25
26        wrapper.Flush();
27    }
28}