Autofacl自动化注册

1.自动注入MVC控制器

   （1）初始化自动化注册服务 RegisterService

　　　　需引用：Autofac，Autofac.Integration.Mvc 这两个程序集

public class RegisterService
    {
        public static ContainerBuilder Register()
        {
            var builder = new ContainerBuilder();
            var baseType = typeof(IDependency);
            var assemblys = AppDomain.CurrentDomain.GetAssemblies().ToList();
            var allServices = assemblys.SelectMany(s => s.GetTypes())
                .Where(p => baseType.IsAssignableFrom(p) && p != baseType);

            builder.RegisterControllers(assemblys.ToArray());

            builder.RegisterAssemblyTypes(assemblys.ToArray()).Where(t => baseType.IsAssignableFrom(t) && t != baseType)
                .AsImplementedInterfaces().InstancePerLifetimeScope();
            
            builder.RegisterGeneric(typeof(EfRepository<>)).As(typeof(IRepository<>)).InstancePerDependency();
            return builder;
        }
    }

   （2） Global中启动该服务

　　　　 var builder = RegisterService.Register();
            DependencyResolver.SetResolver(new AutofacDependencyResolver(builder.Build()));

2.手动指定注入的实例类型

         var builder = new ContainerBuilder();

         builder.RegisterType<DBBase>();

         builder.RegisterType<SqlRepository>().As<IRepository>();

3. 通过Autofac文档中 通过 WebConfig配置实现自动化注入

　Autofac自带了一个Autofac.Configuration.dll 非常方便地对类型进行配置，避免了程序的重新编译。

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <configSections>
    <section name="autofac" type="Autofac.Configuration.SectionHandler, Autofac.Configuration"/>
  </configSections>
  <autofac defaultAssembly="AutofacDemo">
    <components>
      <component type="AutofacDemo.Service, AutofacDemo" service="AutofacDemo.IService,AutofacDemo" />
    </components>
  </autofac>
</configuration>

  使用案例：

var builder = new ContainerBuilder(); 
builder.RegisterType<DatabaseManager>(); 
builder.RegisterModule(new ConfigurationSettingsReader("autofac")); 
using (var container = builder.Build()) 
{ 
    var manager = container.Resolve<DatabaseManager>(); 
    manager.Search("TestA"); 
}