C # 's Log plug-in Nlog basic usage

This article describes the log plug-in for C # Nlog

Installing plugins
Create Logger
Log level
Writing log information
Configuration
Packaging device
Layout

2. Installing plugins

   直接下载插件包 Install-NLog.Config

4. Create Logger

   使用LogManager创建Logger实例，最好一个类里面一个Logger实例    写法一        ConsoleApp1.Program        privatestatic=LogManager.GetCurrentClassLogger();     写法二        这种写法，可以手动设置日志文件中的logger名字        =LogManager.GetLogger("myTest");

6. Log level

   级别由低到高Trace 记录完整的信息，一般只用在开发环境Debug 记录调试信息，没有Trace信息完整，一般也只用在开发环境Info 简单的信息，一般用在生产环境Warn 记录警告信息，一些可以解决的小问题Error 记录报错信息，一般都是Exceptions信息Fatal 非常严重的错误信息

7. Writing log information

   Logger.Trace("Sample trace Message");Logger.Debug("Sample Debug Message");Logger.Info("Sample Informational Message");Logger.Warn("Sample warning message");Logger.Error("Sample error message");Logger.Fatal("Sample fatal error message");or useLogger.Log(LogLevel.Info, "Sample Informational Message");Support formattingMyLogger.Fatal("Sample {0} error message", "Fetal");Try to use Nlog built-in formatting tools, Nlog do the optimization work

8. Configuration

   The most basic configuration is the first step, openNLog.ConfigConfiguration file, add the following configuration<Targets>            <Target Name="LogFile"XSi:Type="File"FileName="File.txt" />//Create a target that represents the configuration of the output log file</targets>        <Rules>            <Logger name="*"MinLevel="Info"WriteTo="LogFile" />//Set the log above the info level to be able to enter what is called the logfile target            /*                1Here logger itself has a name, this name corresponds to the class name, which means that the class name can output the log, asConsoleApp1. Program                2. You can add final="true"property, which indicates that all subsequent logger for this specified name are invalid*/        </rules>in the second step, you can run the codeMulti-target configuration<targets><target name= "logfile" xsi:type= "File" filename= "file.txt"/>        <Target Name="Console"XSi:Type="Console" />//Create a target indicating the output of log information with the console</targets>    <Rules>        <Logger name="*"MinLevel="Trace"WriteTo="LogFile" /><logger name= "*"minlevel=" Info "writeto=" console "/> //The configuration information above the info level is output to target named console    </rules>

9. Packaging device

   Asynchronous wrapper configuration<Targets>        <Target Name="Asyncfile"XSi:Type="Asyncwrapper">            <Target Name="LogFile"XSi:Type="File"FileName="File.txt"/></target>    </targets><rules><logger name= "*"minlevel=" Trace "writeto=" Asyncfile "/>    </rules>There are many wrappers, on-demand self- examination

11. Layout

    布局是用来格式化日志输出信息的    simple日志格式化         <target name="logfile" xsi:type="File" fileName="file.txt" layout="${date:format=yyyyMMddHHmmss} ${message} ${counter:increment=3:sequence=Layout:value=5}"/>        还有很多格式化写法，自行查阅

12. Subclass Inherits Log

    public   Demo1{ protected  Logger Log { Get set }  protected  demo1  () {
               Log =  logmanager . getlogger  (gettype  (). fullname )       }  public  class  Demo2:  demo1{ public   Demo2  () :  base  () { }  }   

C # Log plug-in Nlog basic use