. Net Core uses nlog logging

See also: https://github.com/NLog/NLog.Web/wiki/Getting-started-with-ASP.NET-Core-2

Approximate steps:

• NuGet references Nlog and NLog.Web.AspNetCore 4.5+
• Create the Nlog.config file and partially modify it:

<?XML version= "1.0" encoding= "Utf-8"?><Nlogxmlns= "Http://www.nlog-project.org/schemas/NLog.xsd"Xmlns:xsi= "Http://www.w3.org/2001/XMLSchema-instance"Autoreload= "true"Internalloglevel= "Info"Internallogfile= "Logs\internal-nlog.txt">  <!--Enable ASP. NET Core layout renderers -  <Extensions>    <AddAssembly= "NLog.Web.AspNetCore"/>  </Extensions>  <!--The targets to write to -  <Targets>    <!--write logs to file -    <TargetXsi:type= "File"name= "Allfile"FileName= "Logs\nlog-all-${shortdate}.log"Layout= "${longdate}|${event-properties:item=eventid_id}|${uppercase:${level}}|${logger}|${message} ${exception: format=tostring} " />    <!--another file log, only own logs. Uses some ASP. NET Core renderers -    <TargetXsi:type= "File"name= "Ownfile-web"FileName= "Logs\nlog-own-${shortdate}.log"Layout= "${longdate}|${event-properties:item=eventid_id}|${uppercase:${level}}|${logger}|${message} ${exception: Format=tostring}|url: ${aspnet-request-url}|action: ${aspnet-mvc-action} " />  </Targets>  <!--rules to map from logger name to target -  <rules>    <!--All logs, including from Microsoft -    <Loggername="*"MinLevel= "Trace"WriteTo= "Allfile" />    <!--Skip non-critical Microsoft logs and so log only own logs -    <Loggername= "microsoft.*"Maxlevel= "Info"Final= "true" />    <!--blackhole without WriteTo -    <Loggername="*"MinLevel= "Trace"WriteTo= "Ownfile-web" />  </rules></Nlog>

• Right-click Nlog.config, Properties, build action set to "content", Copy to output directory "always copy"
• In Program.cs:

varLogger = NLog.Web.NLogBuilder.ConfigureNLog ("Nlog.config").            Getcurrentclasslogger (); Try{logger. Debug ("Init main"); varHostbuilder =Createwebhostbuilder (args); varHost =Hostbuilder.build (); Host.            Run (); }            Catch(Exception ex) {//nlog:catch Setup ErrorsLogger. Error (ex,"Stopped Program because of exception"); Throw; }            finally            {                //ensure to flush and stop internal timers/threads before application-exit (Avoid segmentation fault on Linux)NLog.LogManager.Shutdown (); }

• Configure Appsettings.json. Note the settings in the configuration override the Setminimumlevel property in the code. So either delete "Default" using the configuration in the code or set it up correctly.

  {"    Logging": {"LogLevel": {"        Default": "            Trace",            "Microsoft": "Information"    }}}

  Note: If you have multiple environments, note appsetings. The configuration of the Development.json.

• Use:

usingMicrosoft.Extensions.Logging; Public classhomecontroller:controller{Private ReadOnlyIlogger_logger;  PublicHomeController (iloggerlogger) {_logger=logger; }     PublicIactionresult Index () {_logger. Loginformation ("Index page says hello"); returnView (); }

• Results are viewed. If your configuration is consistent with mine, the Internal-nlog.txt file will exist in the project's Logs folder. The output log will be present in the Bin\debug\netcoreapp2.1\logs directory with a date.

. Net Core uses nlog logging