Autofac小例子

谁践踏了优雅 2021-12-13 02:01 218阅读 0赞

AutoFac是.net平台下的IOC容器产品。今天学习一下它的使用方法。

1.最简单的使用。

public interface ITestDao
        {
            string SayHello();
        }
        public class TestDao : ITestDao
        {
            public string SayHello()
            {
                return "hello world!";
            }
        }
        
    
                var builder = new ContainerBuilder();
                builder.RegisterType<TestDao>().As<ITestDao>();
    
                IContainer container = builder.Build();
                var tdao = container.Resolve<ITestDao>();
                string saystr = tdao.SayHello();

builder.RegisterType<TestDao>().As<ITestDao>();注册TestDao是ITestDao的实现。
    然后下面进行调用就行。
    
    2.跟mvc一起使用

public interface ITestDao
        {
            string SayHello();
        }
        public class TestDao : ITestDao
        {
            public string SayHello()
            {
                return "hello world!";
            }
        }
        
    
        public class HomeController : Controller
        {
    
            private ITestDao _testDao;
    
            public HomeController(ITestDao testDao) 
            {
                this._testDao = testDao;
            }
    
            public ActionResult Index()
            {
    
                string saystr = _testDao.SayHello();
    
                return View();
            }
    
        }

在Global.asax里需要添加几行代码

public class MvcApplication : System.Web.HttpApplication
        {
            protected void Application_Start()
            {
                //依赖注入
                var builder = new ContainerBuilder();
                SetupResolveRules(builder);
                builder.RegisterControllers(Assembly.GetExecutingAssembly());
                var container = builder.Build();
                DependencyResolver.SetResolver(new AutofacDependencyResolver(container));
    
    
                AreaRegistration.RegisterAllAreas();
    
                WebApiConfig.Register(GlobalConfiguration.Configuration);
                FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
                RouteConfig.RegisterRoutes(RouteTable.Routes);
                BundleConfig.RegisterBundles(BundleTable.Bundles);
            }
    
            private void SetupResolveRules(ContainerBuilder builder)
            {
                builder.RegisterType<TestDao>().As<ITestDao>();
            }
        }

3.将注册代码放进配置文件。

在Global.asax里需要添加几行代码

protected void Application_Start()
            {
                //依赖注入
                var builder = new ContainerBuilder();
                builder.RegisterModule(new ConfigurationSettingsReader("autofac")); 
                builder.RegisterControllers(Assembly.GetExecutingAssembly());
                var container = builder.Build();
                DependencyResolver.SetResolver(new AutofacDependencyResolver(container));
    
    
                AreaRegistration.RegisterAllAreas();
    
                WebApiConfig.Register(GlobalConfiguration.Configuration);
                FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
                RouteConfig.RegisterRoutes(RouteTable.Routes);
                BundleConfig.RegisterBundles(BundleTable.Bundles);
            }

在Web.config添加配置文件

4.系统自动注册，省略掉手工的配置和xml文件配置。（2014-07-16补充）

写一个基础接口，让你所有的接口都实现此接口，此接口起到的作用仅仅是个标识作用。

public interface IAutofac//标识接口
        {
    
        }
        public interface ITestDao : IAutofac
        {
            string SayHello();
        }
        public class TestDao : ITestDao
        {
            public string SayHello()
            {
                return "hello world!";
            }
        }
        
        public class HomeController : Controller
        {
    
            private ITestDao _testDao;
    
            public HomeController(ITestDao testDao) 
            {
                this._testDao = testDao;
            }
    
            public ActionResult Index()
            {
    
                string saystr = _testDao.SayHello();
    
                return View();
            }
    
        }

然后更改Global.asax里面的代码，AppDomain.CurrentDomain.GetAssemblies()获取当前程序域里所有的程序集，下面让RegisterAssemblyTypes自动注册所有继承了IAutofac的接口。

protected void Application_Start()
            {
                //依赖注入
                var builder = new ContainerBuilder();
                //builder.RegisterModule(new ConfigurationSettingsReader("autofac"));
                
                var assemblys = AppDomain.CurrentDomain.GetAssemblies().ToList();
                builder.RegisterAssemblyTypes(assemblys.ToArray())
                    .Where(e => typeof(IAutofac).IsAssignableFrom(e) && e != typeof(IAutofac))
                    .AsImplementedInterfaces()
                    .InstancePerLifetimeScope();
    
                builder.RegisterControllers(Assembly.GetExecutingAssembly());
                
                var container = builder.Build();
                DependencyResolver.SetResolver(new AutofacDependencyResolver(container));
    
    
    
                AreaRegistration.RegisterAllAreas();
    
                WebApiConfig.Register(GlobalConfiguration.Configuration);
                FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
                RouteConfig.RegisterRoutes(RouteTable.Routes);
                BundleConfig.RegisterBundles(BundleTable.Bundles);
            }

转载于:https://www.cnblogs.com/ariklee/p/3843545.html