Autofac+Mvc4依賴注入

        前段時間也研究了其餘IOC框架，如unity、Castle、Autofac,相對來講Autofac比較簡單，聽說也是效率最高的。首先了解下控制反轉和依賴注入 IoC把建立依賴對象的控制權交給了容器，由容器進行注入對象，因此對象與對象之間是鬆散耦合，利於功能複用，也使得程序的整個體系結構變得很是靈活。

　控制反轉Ioc：調用者不主動建立被調用者實例，由IoC容器來建立;

   依賴注入DI：把依賴關係注入到調用者；

Autofac+Mvc4 項目架構

Student.cs實體

1     public class Student
2     {
3         public string name { get; set; }
4         public int age { get; set; }
5         public string gender { get; set; }
6     }

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IStudentRepository.cs接口

1     public interface IStudentRepository
2     {
3         IEnumerable<Student> GetAll();
4     }

View Code

StudentRepository實現接口

 1  public class StudentRepository : IStudentRepository
 2     {
 3         private List<Student> Articles = new List<Student>(){
 4             new Student { name = "張三", gender = "male", age = 12 },
 5             new Student { name = "李四", gender = "fmale", age = 15 },
 6             new Student { name = "王五", gender = "fmale", age = 13 }};
 7 
 8         /// <summary>
 9         /// 獲取所有學生信息
10         /// </summary>
11         /// <returns></returns>
12         public IEnumerable<Student> GetAll()
13         {
14             return Articles;
15         }
16     }

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HomeControll.cs控制器

 1         #region [AutoFac注入]
 2 
 3         readonly IStudentRepository repository;
 4         //構造器注入
 5         public HomeController(IStudentRepository repository)
 6         {
 7             this.repository = repository;
 8         }
 9 
10         /// <summary>
11         /// AutoFac注入
12         /// </summary>
13         /// <returns></returns>
14         public ActionResult StudentIndex()
15         {
16             var data = repository.GetAll();
17             return View(data);
18         }
19         #endregion

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在App_Start文件夾中添加AutofacConfig.cs文件

 1 public class AutofacConfig
 2     {
 3         /// <summary>
 4         /// 負責調用autofac框架實現業務邏輯層和數據倉儲層程序集中的類型對象的建立
 5         /// 負責建立MVC控制器類的對象(調用控制器中的有參構造函數)
 6         /// </summary>
 7         public static void Register()
 8         {
 9             ContainerBuilder builder = new ContainerBuilder();
10             SetupResolveRules(builder); 
11             builder.RegisterControllers(Assembly.GetExecutingAssembly());
12             builder.RegisterAssemblyTypes(Assembly.GetExecutingAssembly()).AsImplementedInterfaces();
13             var container = builder.Build();
14             DependencyResolver.SetResolver(new AutofacDependencyResolver(container));
15 
16         }
17         /// <summary>
18         /// 全部須要注入的類型
19         /// </summary>
20         /// <param name="builder"></param>
21         private static void SetupResolveRules(ContainerBuilder builder)
22         {
23             builder.RegisterType<StudentRepository>().As<IStudentRepository>();
24         }
25     }

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在Global.asax.cs類Application_Start方法中註冊Autofac 

 1  public class MvcApplication : System.Web.HttpApplication
 2     {
 3         protected void Application_Start()
 4         {
 5             AreaRegistration.RegisterAllAreas();
 6 
 7             WebApiConfig.Register(GlobalConfiguration.Configuration);
 8             FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
 9             RouteConfig.RegisterRoutes(RouteTable.Routes);
10             BundleConfig.RegisterBundles(BundleTable.Bundles);
11             
12             AutofacConfig.Register();//AutoFac注入
13         }
14     }

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執行程序返回數據

 

能夠參考http://www.cnblogs.com/bubugao/p/AutofacDemo.html文章，簡單明瞭解釋Autofac做用。