使用AutoFac实现依赖注入(封装一个注册类)

  public class AutoFacBootStrapper
     {
         public static void CoreAutoFacInit()
         {
             var builder = new ContainerBuilder();
             HttpConfiguration config = GlobalConfiguration.Configuration;
             SetupResolveRules(builder);
             //注册所有的Controllers,// 通过PropertiesAutowired制定类型A在获取时会自动注入A的属性//InstancePerLifetimeScope 保证对象生命周期基于请求//InstancePerDependency 对每一个依赖或每一次调用创建一个新的唯一的实例，这也是默认的创建实例的方式。
             builder.RegisterControllers(Assembly.GetExecutingAssembly()).PropertiesAutowired().InstancePerDependency();
             //注册所有的ApiControllers
             builder.RegisterApiControllers(Assembly.GetExecutingAssembly()).PropertiesAutowired().InstancePerDependency();
             builder.RegisterType<MemberQueryFilterAttribute>().PropertiesAutowired();//注意，这里要把我们的全局Filter注册到Autofac中
             builder.RegisterType<ParamsCheckFilterAttribute>().PropertiesAutowired();
             builder.RegisterWebApiFilterProvider(GlobalConfiguration.Configuration);
             var container = builder.Build();
             //注册api容器需要使用HttpConfiguration对象
             config.DependencyResolver = new AutofacWebApiDependencyResolver(container);
             //注册MVC容器
             DependencyResolver.SetResolver(new AutofacDependencyResolver(container));
         }

         private static void SetupResolveRules(ContainerBuilder builder)
         {
             //WebAPI只用引用BLL和DAL的接口，不用引用实现的dll。
             //如需加载实现的程序集，将dll拷贝到bin目录下即可，不用引用dll
             var iBLL = Assembly.Load("cpm.IBLL");
             var BLL = Assembly.Load("cpm.BLL");
             var iDAL = Assembly.Load("cpm.IDAL");
             var DAL = Assembly.Load("cpm.DAL");

             //根据名称约定（服务层的接口和实现均以BLL结尾），实现服务接口和服务实现的依赖
             builder.RegisterAssemblyTypes(iBLL, BLL)
               .Where(t => t.Name.EndsWith("BLL"))
               .AsImplementedInterfaces().PropertiesAutowired().InstancePerDependency();

             //根据名称约定（数据访问层的接口和实现均以DAL结尾），实现数据访问接口和数据访问实现的依赖
             builder.RegisterAssemblyTypes(iDAL, DAL)
               .Where(t => t.Name.EndsWith("DAL"))
               .AsImplementedInterfaces().PropertiesAutowired().InstancePerDependency();
             //注册其他模块
             builder.RegisterModule<DbModule>();
             builder.RegisterModule<WebModule>();
         }
     }

  /// <summary>
    /// web通用类注册
    /// </summary>
    public class WebModule:Module
    {
        protected override void Load(ContainerBuilder builder)
        {
            //这里的示例 具体情况自己创建
            builder.Register<IUserService>(c => RequestWrapper<IUserService>.CreateInstance()).InstancePerDependency();

        }
    }

在webapi项目global文件重要启动注入