无配置文件下使用log4net

一般使用log4net时，都通过XML文件进行配置。如果你不想用XML文件，可以通过代码进行配置，示例代码如下：

string LOG_PATTERN = "%d [%t] %-5p %c [%x] - %m%n";
string LOG_FILE_PATH = Server.MapPath("job.log");

Hierarchy hierarchy = (Hierarchy)LogManager.GetRepository();
hierarchy.Name = "job.cnblogs.com";
TraceAppender tracer = new TraceAppender();

PatternLayout patternLayout = new PatternLayout();
patternLayout.ConversionPattern = LOG_PATTERN;
patternLayout.ActivateOptions();

tracer.Layout = patternLayout;
tracer.ActivateOptions();
hierarchy.Root.AddAppender(tracer);

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 = LOG_FILE_PATH;
roller.ActivateOptions();
hierarchy.Root.AddAppender(roller);

hierarchy.Root.Level = log4net.Core.Level.All;
hierarchy.Configured = true;

log4net.LogManager.GetLogger("job.cnblogs.com").Info("Hello world!");