PostFilteringTargetWrapper Class

public class PostFilteringTargetWrapper : WrapperTargetBase

Public Class PostFilteringTargetWrapper
	Inherits WrapperTargetBase

Dim instance As PostFilteringTargetWrapper

type PostFilteringTargetWrapper =  
    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="BufferingWrapper" bufferSize="100">
 6            <target xsi:type="PostFilteringWrapper" defaultFilter="level &gt;= LogLevel.Info">
 7                <target xsi:type="File" fileName="${basedir}/file.txt" />
 8                <when exists="level &gt;= LogLevel.Warn" filter="level &gt;= LogLevel.Debug"/>
 9            </target>
10        </target>
11    </targets>
12
13    <rules>
14        <logger name="*" minlevel="Debug" writeTo="file" />
15    </rules>
16</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        PostFilteringTargetWrapper postFilteringTarget = new PostFilteringTargetWrapper();
16        postFilteringTarget.WrappedTarget = wrappedTarget;
17
18        // set up default filter
19        postFilteringTarget.DefaultFilter = "level >= LogLevel.Info";
20
21        FilteringRule rule;
22
23        // if there are any warnings in the buffer
24        // dump the messages whose level is Debug or higher
25
26        rule = new FilteringRule();
27        rule.Exists = "level >= LogLevel.Warn";
28        rule.Filter = "level >= LogLevel.Debug";
29
30        postFilteringTarget.Rules.Add(rule);
31
32        BufferingTargetWrapper target = new BufferingTargetWrapper();
33        target.BufferSize = 100;
34        target.WrappedTarget = postFilteringTarget;
35
36        NLog.Config.SimpleConfigurator.ConfigureForTargetLogging(target, LogLevel.Debug);
37
38        Logger logger = LogManager.GetLogger("Example");
39        logger.Debug("log message");
40    }
41}