NetCore use log4

NetCore two ways of log4

A. You need to specify the log warehouse

nuget：log4net，Microsoft.Extensions.Logging.Log4Net.AspNetCore

1. When the program starts, first create a log warehouse, warehouse log custom, the entire system is the only one of the best warehouse management

. 1  public the Startup (Configuration IConfiguration, IHostingEnvironment Environment)
 2  {
 . 3     / * var = new new ConfigurationBuilder Builder () setBasePath (environment.ContentRootPath) .AddJsonFile ( "appsettings.json");. // json configuration file loading
 . 4     the Configuration = Configuration; * / 
. 5  . 6 // String = environment.WebRootPath the root; // the root directory of the project point . 7 String contentRootPath = environment.ContentRootPath; // points to a directory item . 8     System.IO.FileInfo for the fileInfo = new new System.IO.FileInfo for (contentRootPath + " \\ Config \\ log4net.config   
    
" ); // load log4net profile 
9     log4net.Repository.ILoggerRepository Logger = log4net.LogManager.CreateRepository ( " NETCoreRepository " ); // create a log warehouse, custom name 
10    log4net.Config.XmlConfigurator.Configure (Logger, the fileInfo ); // disposed
 . 11    // log4net.Config.XmlConfigurator.ConfigureAndWatch (Logger, the fileInfo); // configuration and matching 
12 }

2. Use

log4net.ILog log = log4net.LogManager.GetLogger("NETCoreRepository",GetType());
log.info ( " Ordinary log " );
log.error ( " error message " );

II. Log warehouse, assembly without specifying the default log warehouse

 1   public class Program
 2     {
 3         public static void Main(string[] args)
 4         {
 5             BuildWebHost(args).Run();
 6         }
 7 
 8 
 9 
10         public static IWebHost BuildWebHost(string[] args) =>
11             WebHost.CreateDefaultBuilder(args)
12             .UseUrls("http://*:5001")
13             .UseIISIntegration()
14              .ConfigureLogging(loggingBuilder =>
15              {
16                  loggingBuilder.AddFilter("System", LogLevel.Warning);
17                  loggingBuilder.AddFilter("Microsoft", LogLevel.Warning);//过滤掉系统默认的一些日志
18                  loggingBuilder.AddLog4Net(@"Config\log4net.config");
19              })
20             .UseStartup<Startup>()
21             .Build();
22     }

2. Use

1    log4net.ILog log = log4net.LogManager.GetLogger (GetType ()); // this kind without specifying a log warehouse 
2    log.info ( " Ordinary log " );
 3    log.error ( " error message " );

Or so

_Factory = ILoggerFactory // vessel injection object to him 
_Factory.CreateLogger <T> () LogError (. " Here Error ILoggerFactory " ); // T is the current class type 
_Factory.LogWarning ($ " Normal Log " );

Used in the controller, injection ILoggerFactory (:) namespace is feasible, log4net.ILog log is not

1  a using ILoggerFactory = Microsoft.Extensions.Logging.ILoggerFactory; // must be the name the control, in order to successfully inject
 2  // a using ILoggerFactory = log4net.Repository.Hierarchy.ILoggerFactory; // this is wrong, injection failed 
3  4 public class defaultController: the Controller
 . 5 {
 . 6 Private ILoggerFactory _Factory = null ;
 . 7 Private ILogger <defaultController> _logger = null ;
 . 8 // log4net.ILog log, does not support the injection, . 9 public                  
      DefaultController(ILoggerFactory factory,ILogger<DefaultController> logger )
10     {
11         this._Factory = factory;
12         this._logger = logger;
13     }
14 }

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