Skip to main content

How to use Log4Net in .Net Core 2.0 Application.






1. Introduction

Logging frameworks are important because they make it easy to write your logs to different places by simply changing your configuration. You can write your .NET logs to a file on disk, a database, a log management system


2. Install Nuget Package For nlog 

To use Nlog logging you need to first add Nlog pluging for adding pluging you can do it by different way.
1) Manage Nuget Packages.
2) Nuget command.

you can find nuget command for Log4Net below.

PM> Install-Package log4net -Version 2.0.8 

3. Add log4net.config file

We need to Add New to your project with name log4net.config




Refer below code for log4net.config for logging log into file.


  
    
    
    
    
    
    
    
    
    
      
    
  
  
    
    
  


Root is neccesary in log4net.config, in which we can define log level and appender-ref in which we can define appender for
eg. FileAppender, ConsoleAppender.


    
    


Layout : In layout we can define custom parameter shown below.


      



4. Logging Levels

There are seven logging levels five.

 a) OFF - nothing gets logged (cannot be called)
 b) FATAL
 c) ERROR
 d) WARN
 e) INFO
 f) DEBUG
 g) ALL - everything gets logged (cannot be called)


5. Different Appender

 a) Rolling File Appender -It writes to the output window, or the command window.
 b) File Appender -This appender will write to a text file.
 c) ADO.NET Appender -This appender will write to a Database.
 d) Console Appender
-This appender Perform the same functions as the file appender but with the additional option to only store a certain amount of data before starting a new log file

6. Logging Manager of Log4Net

public static class Logger
       {
       
        private static readonly string LOG_CONFIG_FILE = @"log4net.config";
       
        private static readonly log4net.ILog _log = GetLogger(typeof(Logger));
       
        public static ILog GetLogger(Type type)
        {
            return LogManager.GetLogger(type);
        }
     
        public static void Debug(object message)
        {
            SetLog4NetConfiguration();
            _log.Debug(message);
        }
  
      private static void SetLog4NetConfiguration()
        {
            XmlDocument log4netConfig = new XmlDocument();
            log4netConfig.Load(File.OpenRead(LOG_CONFIG_FILE));

            var repo = LogManager.CreateRepository(
                Assembly.GetEntryAssembly(), typeof(log4net.Repository.Hierarchy.Hierarchy));

            log4net.Config.XmlConfigurator.Configure(repo, log4netConfig["log4net"]);
        }
   }  


Load and Read Log4Net Config File:

You need to name your config file to be your assembly name and it needs to have the extension you specify. Here is an example

private static void SetLog4NetConfiguration()
        {
            XmlDocument log4netConfig = new XmlDocument();
            log4netConfig.Load(File.OpenRead(LOG_CONFIG_FILE));

            var repo = LogManager.CreateRepository(
                Assembly.GetEntryAssembly(), typeof(log4net.Repository.Hierarchy.Hierarchy));

            log4net.Config.XmlConfigurator.Configure(repo, log4netConfig["log4net"]);
        }   


 
 Happy Coding. Please Add comment if you have any query.

Comments

  1. I cannot see code in 3 of the 6 snippets. Might just be me

    ReplyDelete
  2. I followed all your steps but not able to find log file. Where is it created? Thanks.

    ReplyDelete
    Replies
    1. I also cant find the file :(

      Delete
    2. Ok Let me upload source code. will share path soon

      Delete

Post a Comment

Popular posts from this blog

Custom AuthorizeAttribute in ASP.NET Core.

Introduction. Filter in MVC are attribute which can be apply to controller and action method. filters allow us to write our custom code before and after method execution. filters can be implemented into different level of scope Global, Class, and Method level. MVC provides different types of filters. The Authorization filter will run first and are used to determine whether the current user is authorized or unauthorized for the current request. In this article we will learn how to create custom authorization filter, were you can write your own authorization framework. Description. For creating Authorization filter IAuthorizationFilter interface must be inherited. For example, the following code demonstrate custom Authorization below CustomAuthorization attribute allow only Home controller to access the particular method under home controller class else it will return "error" in response if it is called via ajaxcall, otherwise it will be redirect to Sessi

What are PascalCase and CamelCase In Programing Language?

What are PascalCase and CamelCase In Programing Language?. Pascal Case  :-  In programming,  PascalCase   means that the first letter of every word in the name is capitalized. In Pascal Case if acronym exists in the word then only the first letter of that acronym should be capital. Eg:  ThisWordIsInPascalCase  . No other characters are used to separate the words, like hyphens or underscores. For example: BackColor TimeUtc FirstName CamelCase  :-    camelCase  or  CamelCase ; also known as  camel caps  or more formally as  medial capitals.  It is the same as Pascal Case, but the first letter of the first word is lowercased. this article calls the two alternatives  upper camel case  (initial upper case letter also known as Title Case) and  lower camel case  (initial lower case letter). Some people and organizations, notably  Microsoft  ,  use the term  camel case  only for lower camel case. For example: backColor timeUtc firstName Snake_case  :-PascalCase and camelCase