FilteringTargetWrapper Class

public class FilteringTargetWrapper : WrapperTargetBase

Public Class FilteringTargetWrapper
	Inherits WrapperTargetBase

Dim instance As FilteringTargetWrapper

type FilteringTargetWrapper =  
    class
        inherit WrapperTargetBase
    end

 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        <target name="file" xsi:type="FilteringWrapper" condition="contains('${message}','1')">
 6            <target xsi:type="File" fileName="${basedir}/file.txt" />
 7        </target>
 8    </targets>
 9
10    <rules>
11        <logger name="*" minlevel="Debug" writeTo="file" />
12    </rules>
13</nlog>

 1using System;
 2
 3using NLog;
 4using NLog.Targets;
 5using NLog.Targets.Wrappers;
 6using System.Diagnostics;
 7
 8class Example
 9{
10    static void Main(string[] args)
11    {
12        FileTarget wrappedTarget = new FileTarget();
13        wrappedTarget.FileName = "${basedir}/file.txt";
14
15        FilteringTargetWrapper filteringTarget = new FilteringTargetWrapper();
16        filteringTarget.WrappedTarget = wrappedTarget;
17
18        filteringTarget.Condition = "contains('${message}','1')";
19
20        NLog.Config.SimpleConfigurator.ConfigureForTargetLogging(filteringTarget, LogLevel.Debug);
21
22        Logger logger = LogManager.GetLogger("Example");
23        logger.Debug("log message 0");
24        logger.Debug("log message 1");
25        logger.Debug("log message 2");
26        logger.Debug("log message 11");
27    }
28}