日志记录显然是框架设计中不可或缺的元素，在本框架中，我们将使用log4net作为日志记录的主体。下面来具体说明如何让框架继承log4net，并通过Autofac进行IOC注入。
首先，定义好我们的Log日志操作接口：
1: public interface ILoggerService
2: {
3: void Info(string message);
4: void Warn(string message);
5: void Debug(string message);
6: void Error(string message);
7: void Error(Exception ex);
8: void Fatal(string message);
9: void Fatal(Exception ex);
10: }
具体的解释我就不用说了，其中Info代表正常日志，Warn代表告警日志，Debug代表调试日志，Error代表错误日志，Fatal代表系统崩溃日志。
下面是其实现部分：
1: public class LoggerService:ILoggerService
2: {
3: public LoggerService()
4: {
5: log4net.Config.XmlConfigurator.Configure();
6: logger = LogManager.GetLogger(typeof(LoggerService));
7: }
8:
9: private readonly ILog logger;
10:
11: public void Info(string message)
12: {
13: logger.Info(message);
14: }
15: public void Warn(string message)
16: {
17: logger.Warn(message);
18: }
19: public void Debug(string message)
20: {
21: logger.Debug(message);
22: }
23: public void Error(string message)
24: {
25: logger.Error(message);
26: }
27: public void Error(Exception ex)
28: {
29: logger.Error(ex.Message, ex);
30: }
31: public void Fatal(string message)
32: {
33: logger.Fatal(message);
34: }
35: public void Fatal(Exception ex)
36: {
37: logger.Fatal(ex.Message, ex);
38: }
39: }
我在构造中对log4net进行了配置，同时获取了log4net的日志记录对象。我们的配置需要写到用户接口中的web.config文件中：
1: <configSections>
2: <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler,Log4net"/>
3: </configSections>
4:
5: <log4net>
6: <root>
7: <level value="DEBUG"/>
8: <appender-ref ref="LogFileAppender"/>
9: </root>
10: <appender name="LogFileAppender" type="log4net.Appender.RollingFileAppender">
11: <param name="File" value="C:\log.txt"/>
12: <param name="AppendToFile" value="true"/>
13: <rollingStyle value="Size"/>
14: <maxSizeRollBackups value="10"/>
15: <maximumFileSize value="10MB"/>
16: <staticLogFileName value="true"/>
17: <layout type="log4net.Layout.PatternLayout">
18: <param name="ConversionPattern" value="%-5p%d{yyyy-MM-dd hh:mm:ss} – %m%n"/>
19: </layout>
20: </appender>
21: </log4net>
之后在Aufofac中注入一下：
builder.RegisterType<LoggerService>().As<ILoggerService>().InstancePerHttpRequest();
最后，在页面中，我们可以通过构造函数获取其实例：
1: public BookService(IUnitOfWork unitOfWork
2: , IBook bookRepository
3: , IBookType bookTypeRepository
4: , IBookPlace bookPlaceRepository
5: , ICacheManager cacheManager
6: , ILoggerService logger
7: )
8: {
9: this.unitOfWork = unitOfWork;
10: this.bookRepository = bookRepository;
11: this.bookTypeRepository = bookTypeRepository;
12: this.bookPlaceRepository = bookPlaceRepository;
13: this.cacheManager = cacheManager;
14: this.logger = logger;
15: }
16:
17: private readonly IUnitOfWork unitOfWork;
18: private readonly IBook bookRepository;
19: private readonly IBookType bookTypeRepository;
20: private readonly IBookPlace bookPlaceRepository;
21: private readonly ICacheManager cacheManager;
22: private readonly ILoggerService logger;
得到的日志结果如下：
