关于javascript:MVC依赖注入和AutoFac

么是依赖？
简略的说，如果A（对象）实现它的一个工作，须要B（对象）的帮忙，咱们就是A依赖于B。

比方，咱们我的项目中，IndexModel的OnGet()办法须要ProblemRepository对象的Get()办法，这就能够说成：IndexModel依赖IProblemRepository。

public class IndexModel : PageModel
{

public void OnGet(){    //其余代码……    Problems = new ProblemRepository().Get(pageIndex, pageSize);}

}
依赖的另一种说法就是：耦合。

有两个十分驰名的设计准则，同学们应该烂熟于心，张嘴就来：

高内聚，低耦合
依赖形象，而不是依赖实现
1和2其实就是指标和办法的关系，即要做到1这种成果，能够采纳2这种办法。

咱们下面的代码就是依赖实现（具体的ProblemRepository类），要依赖形象，咱们须要形象出一个接口：IProblemRepository

public interface IProblemRepository{    IList<Problem> Get(int pageIndex, int pageSize);}

而后由ProblemRepository实现它……

【延长】

原本：是在PageModel的构造函数中确定着Service的生成，

    public IndexModel()    {        _repository = new MockProblemRepository();    }当初是：

从内部“注入”到IndexModel中，这就被称之为：依赖注入

具体应用哪一个service由startup.cs管制，这就被称之为：管制反转（IoC：Inversion of Control）

AutoFac

依赖形象，而不是依赖实现

同ASP.NET core内置的Service一样，是一种第三方依赖注入工具。因为其在MVC中十分风行，所以除了Autofac组件以外，还有专门的MVC integration组件：

通过nuget下载了上述两个Autofac类库之后：

注册
在Global.asax文件中，MvcApplication.cs的Application_Start()办法中：

        //1. 取得一个ContainerBuilder（容器建造器）对象         ContainerBuilder builder = new ContainerBuilder();        //2. 注册Controller和FilterProvider        builder.RegisterControllers(typeof(MvcApplication).Assembly);        builder.RegisterFilterProvider();        //配置：批示应用何种interface实例呢？        //2.1 能够一个类一个类的注册        //builder.RegisterType<MockUserService>().As<IUserService>();        //2.2 也能够整个程序集的注册        builder.RegisterAssemblyTypes(typeof(ProdUserService).Assembly)            .AsImplementedInterfaces();        //3. 通过ContainerBuilder失去一个IContainer容器对象，        //4. 并为MVC主动设定解析（resolve：获取“接口对象”）        IContainer container = builder.Build();        DependencyResolver.SetResolver(new AutofacDependencyResolver(container));

留神上述代码，1/2/3/4都只须要原样照写就是了。须要开发者自定义设置的是：2.1和2.2。

per-request lifetime support.

how dependency lifetime scopes work in general

为什么还是要讲AutoFac？

兼顾“旧技术”，一看就是培训班进去的！
开始造就本人的学习能力

注入
能够通过构造函数注入，和ASP.NET core中一样。

Filter中没有构造函数，所以应用的是属性注入。https://github.com/hdfgfgh546...
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