1 Obtaining this class:

First, enter the Install nlog command on the Nuget console: install-package nlog.config

The second option is to search for installation Nlog and Nlog Configuration on the Nuget package management interface. This automatically generates a config file, which is easily separated from the application or the Web’s own config file for future use and management

The third lot on https://github.com/NLog/NLog/ https://github.com/NLog/NLog/releases/

– Defines the target/output of the log, subordinate to

– Defines the routing rules for logs

AutoReload Indicates whether automatic loading is allowed after the configuration file is changed. ThrowExceptions The internal log system throws an exception Optional Trace | Debug | Info | Warn | Error | Fatal decision level of internal log Off closed internalLogFile put internal debugging and exception information written proposal throwExceptions value for the specified file is set to "false", This prevents problems caused by logging from crashing the application.Copy the code

The various rules are configured in the logger child tag

Name - The name of the logger minLevel - Lowest level maxLevel - Highest level level - Single log level Levels - A series of log levels, separated by commas. WriteTo - A list of targets to which the log should be written when a rule matches, separated by commas.Copy the code

1 add a reference using NLog;

2 instantiation private Logger Logger. = that the LogManager GetCurrentClassLogger ();

3 call:

 logger.Trace("Trace Message");
 logger.Debug("Debug Message");
 logger.Info("Info Message");
 logger.Error("Error Message");
 logger.Fatal("Fatal Message");
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5. Examples of effects

1 Configure output to file:

 
      
<nlog xmlns="http://www.nlog-project.org/schemas/NLog.xsd"
      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
      xsi:schemaLocation="http://www.nlog-project.org/schemas/NLog.xsd NLog.xsd"
      autoReload="true"
      throwExceptions="false"
      internalLogLevel="Off" internalLogFile="c:\temp\nlog-internal.log">
  <variable name="variable1" value=${newline}date: ${date}${newline}level: ${level}${newline} Logger: ${logger}${newline}machinename: ${date}${newline}level: ${level}${newline} Logger: ${logger}${newline}machinename: ${machinename} ${newline}message: ${message}${newline} appDomain: ${appDomain}${newline}assembly-version: ${machinename} ${newline}message: ${message}${newline} appDomain: ${appDomain}${newline}assembly-version: ${assembly-version}${newline}basedir: ${basedir} ${newline}callsite: ${callsite}${newline}callsite-linenumber: ${callsite-linenumber}${newline}counter: ${counter}${newline}nlogdir: ${nlogdir} ${newline}processid: ${processid}${newLine} processName: ${processName}${newline} SpecialFolder: ${specialFolder}${newline} StackTrace: ${stacktrace}${newline}-----------------------------------------------------------" />
  <targets>
    <target name="log_file" xsi:type="File" fileName="${basedir}/LogInformation/${level}_${shortdate}.txt" layout="${variable1}" />
  </targets>
  <rules>
    <logger name="*"   writeTo="log_file" />
  </rules>
</nlog>
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Effect:

Appendix: Layouts attribute

Official reference: github.com/nlog/NLog/w… https://github.com/nlog/NLog/wiki/Targets github.com/NLog/NLog/r… http://nlog-project.org/