c# - Log4Net：プログラムで複数のロガーを指定します（複数のファイルアペンダーを使用）

Question

Log4Netで複数のロガーを（プログラムで、xml構成なしで）構成する方法は？別のファイルに書き込むためにそれらが必要です。

Answer 1

log4net ダッシュボードのこのスレッドでは、アプローチについて詳しく説明しています。

少し要約すると、できれば多くのコードを食い物にしないでください。

using log4net;
using log4net.Appender;
using log4net.Layout;
using log4net.Repository.Hierarchy;

// Set the level for a named logger
public static void SetLevel(string loggerName, string levelName)
{
    ILog log = LogManager.GetLogger(loggerName);
    Logger l = (Logger)log.Logger;

    l.Level = l.Hierarchy.LevelMap[levelName];
    }

// Add an appender to a logger
public static void AddAppender(string loggerName, IAppender appender)
{
    ILog log = LogManager.GetLogger(loggerName);
    Logger l = (Logger)log.Logger;

    l.AddAppender(appender);
}

// Create a new file appender
public static IAppender CreateFileAppender(string name, string fileName)
{
    FileAppender appender = new
        FileAppender();
    appender.Name = name;
    appender.File = fileName;
    appender.AppendToFile = true;

    PatternLayout layout = new PatternLayout();
    layout.ConversionPattern = "%d [%t] %-5p %c [%x] - %m%n";
    layout.ActivateOptions();

    appender.Layout = layout;
    appender.ActivateOptions();

    return appender;
}

// In order to set the level for a logger and add an appender reference you
// can then use the following calls:
SetLevel("Log4net.MainForm", "ALL");
AddAppender("Log4net.MainForm", CreateFileAppender("appenderName", "fileName.log"));

// repeat as desired

Answer 2

using System;
using Com.Foo;
using System.Collections.Generic;
using System.Text;
using log4net.Config;
using log4net;
using log4net.Appender;
using log4net.Layout;
using log4net.Repository.Hierarchy;


public class MyApp
{


    public static void SetLevel(string loggerName, string levelName)
    {
        ILog log = LogManager.GetLogger(loggerName);
        Logger l = (Logger)log.Logger;

        l.Level = l.Hierarchy.LevelMap[levelName];
    }

    // Add an appender to a logger
    public static void AddAppender(string loggerName, IAppender appender)
    {
        ILog log = LogManager.GetLogger(loggerName);
        Logger l = (Logger)log.Logger;

        l.AddAppender(appender);
    }
    // Add an appender to a logger
    public static void AddAppender2(ILog log, IAppender appender)
    {
       // ILog log = LogManager.GetLogger(loggerName);
        Logger l = (Logger)log.Logger;

        l.AddAppender(appender);
    }

    // Create a new file appender
    public static IAppender CreateFileAppender(string name, string fileName)
    {
        FileAppender appender = new
            FileAppender();
        appender.Name = name;
        appender.File = fileName;
        appender.AppendToFile = true;

        PatternLayout layout = new PatternLayout();
        layout.ConversionPattern = "%d [%t] %-5p %c [%logger] - %m%n";
        layout.ActivateOptions();

        appender.Layout = layout;
        appender.ActivateOptions();

        return appender;
    }

    private static readonly ILog log = LogManager.GetLogger(typeof(MyApp));
    static void Main(string[] args)
    {
        BasicConfigurator.Configure();
        SetLevel("Log4net.MainForm", "ALL");
        AddAppender2(log, CreateFileAppender("appenderName", "fileName.log"));
        log.Info("Entering application.");
        Console.WriteLine("starting.........");
        log.Info("Entering application.");
        Bar bar = new Bar();
        bar.DoIt();
        Console.WriteLine("starting.........");
        log.Error("Exiting application.");
        Console.WriteLine("starting.........");
    }
}


namespace Com.Foo
{
    public class Bar
    {
        private static readonly ILog log = LogManager.GetLogger(typeof(Bar));

        public void DoIt()
        {
            log.Debug("Did it again!");
        }
    }
}