关于javascript:MVC依赖注入和AutoFac

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共计 18626 个字符，预计需要花费 47 分钟才能阅读完成。

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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javascript
发表至： javascript
2020-12-27
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