Below are steps in integrating Log4Net in Asp.Net Core.
1) First install required package:
dotnet add package Microsoft.Extensions.Logging.Log4Net.AspNetCore
2) Create file log4net.config with following xml content
<?xml version="1.0" encoding="utf-8" ?>
<log4net>
<appender name="RollingFileAppender" type="log4net.Appender.RollingFileAppender">
<file type="log4net.Util.PatternString" value="Logs/Logs_%date{yyyyMMdd}.txt" />
<rollingStyle value="Date" />
<appendToFile value="true" />
<rollingStyle value="Size" />
<datePattern value="yyyyMMdd" />
<maxSizeRollBackups value="10" />
<maximumFileSize value="10000KB" />
<staticLogFileName value="true" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%-5level %date{dd-mm-yyyy HH:mm:ss} %logger [%thread] - %message %exception%newline" />
</layout>
</appender>
<root>
<appender-ref ref="RollingFileAppender" />
<level value="All" />
</root>
</log4net>
3) Inside Appsetting.js add section to save log4net config path ,section is added on same level as "Logging"
"Log4NetConfigFile": {
"Name": "Services/LoggingService/log4net.config"
}
My log4net.config is inside services/LoggingService you can add it in project root if so section will need tiny modification in path as below.
"Log4NetConfigFile": {
"Name": "log4net.config"
}
3) inside Configure method in StartUp.cs add
loggerFactory.AddConsole(Configuration.GetSection("Logging"));
loggerFactory.AddDebug();
loggerFactory.AddLog4Net(Configuration.GetValue<string>("Log4NetConfigFile:Name"));
4) Inside Your Test controller add class variable
private readonly ILogger Logger;
and inject its dependency through constructor
public TestController(ILoggerFactory DepLoggerFactory, IHostingEnvironment DepHostingEnvironment)
{
HostingEnvironment = DepHostingEnvironment;
Logger = DepLoggerFactory.CreateLogger("Controllers.TestController");
}
5) Now Create Test Action
public IActionResult GetAllMyModels(string id)
{
var comments = (from m in Db.MyModelChild
where m.ParentId.ToString() == id
select m).ToList();
Logger.LogInformation("Test log information 001");
if (comments.Count() == 0)
{
Logger.LogInformation("Test log information 002");
return NotFound();
}
return new ObjectResult(comments);
}
on success this method emit MyModelChild objects as json
6) Now check to Logs folder in root redirectory its created with pattern of YYYYMMDD prepended with "Logs_"
Logs_20180116.txt.Logged text also include timestamp.
Output:
INFO 16-13-2018 11:13:24 Controllers.TestController [7] - Test log information 001
In my case i am getting data so above log text will be there along with other output from dotnet run which falls in info.
we can write other kind of log than warning too.
