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copied!<p>The code below shows how you can programatically configure log4Net without using a configuration file to achieve the effect you're looking for. Basically, it just involves creating a named logger and adding to the hierarchy.</p> <p>I used as a starting point one of the answers from <a href="https://stackoverflow.com/questions/769983/how-to-configure-log4net-programmatically-from-scratch-no-config">here</a>.</p> <pre><code>using log4net; using log4net.Appender; using log4net.Layout; using log4net.Repository.Hierarchy; namespace LoggerTest { class Program { static void Main(string[] args) { DeviceConnection dev1 = new DeviceConnection("Device1"); DeviceConnection dev2 = new DeviceConnection("Device2"); dev1.DoSomething(); dev2.DoSomething(); } } public class DeviceConnection { private string name; private readonly ILog logger; public DeviceConnection(string _name) { name = _name; logger = TestLogger.AddNamedLogger(name); logger.Info("---- Begin Logging for DeviceConnection: " + name); } public void DoSomething() { logger.Info("Doing something for device connection " + name); } } public static class TestLogger { private static PatternLayout _layout = new PatternLayout(); private const string LOG_PATTERN = "%d [%t] %-5p %m%n"; public static string DefaultPattern { get { return LOG_PATTERN; } } static TestLogger() { _layout.ConversionPattern = DefaultPattern; _layout.ActivateOptions(); Hierarchy hierarchy = (Hierarchy)LogManager.GetRepository(); hierarchy.Configured = true; } public static PatternLayout DefaultLayout { get { return _layout; } } public static ILog AddNamedLogger(string name) { Hierarchy hierarchy = (Hierarchy)LogManager.GetRepository(); Logger newLogger = hierarchy.GetLogger(name) as Logger; PatternLayout patternLayout = new PatternLayout(); patternLayout.ConversionPattern = LOG_PATTERN; patternLayout.ActivateOptions(); RollingFileAppender roller = new RollingFileAppender(); roller.Layout = patternLayout; roller.AppendToFile = true; roller.RollingStyle = RollingFileAppender.RollingMode.Size; roller.MaxSizeRollBackups = 4; roller.MaximumFileSize = "100KB"; roller.StaticLogFileName = true; roller.File = name + ".log"; roller.ActivateOptions(); newLogger.AddAppender(roller); return LogManager.GetLogger(name); } } } </code></pre>

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