ASP.NET Core DependencyResolver [英] ASP.NET Core DependencyResolver

问题描述

在ASP.NET MVC 5中，可以通过DependencyResolver.Current.GetService<T>()获得某些依赖关系. ASP.NET Core中有类似的东西吗?

In ASP.NET MVC 5 is possible to obtain some dependency through DependencyResolver.Current.GetService<T>(). Is there something similar in ASP.NET Core?

推荐答案

是的.在ASP.NET Core 1.0.0中，来自HttpContext的请求中可用的服务通过RequestServices集合 ^[1] :

Yes, there is. In ASP.NET Core 1.0.0, the services available within a request from HttpContext are exposed through the RequestServices collection^[1]:

this.HttpContext.RequestServices

您可以使用GetService方法通过指定依赖项的类型来检索依赖项:

You can use the GetService method to retrieve the dependencies by specifying the type of the dependency:

this.HttpContext.RequestServices.GetService(typeof(ISomeService));

通常，您不应该直接使用这些属性，而应该通过类的构造函数请求所需的类类型，并让框架注入这些依赖项.这样产生的类更易于测试，并且耦合更松散.

Generally, you shouldn’t use these properties directly, preferring instead to request the types your classes you require via your class’s constructor, and letting the framework inject these dependencies. This yields classes that are easier to test and are more loosely coupled.

_{[1] https://docs.asp.net/en/latest/fundamentals/dependency-injection.html#request-services}

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