Register和RegisterType之间的Autofac差异 [英] Autofac difference between Register and RegisterType

问题描述

我已按照以下教程开始使用Autofac: http://flexamusements.blogspot.com/2010/09/dependency-injection-part-3-making-our.html

I have started to use Autofac following this tutorials: http://flexamusements.blogspot.com/2010/09/dependency-injection-part-3-making-our.html

构造函数中没有参数的简单类

builder.RegisterType<ConsoleOutputService>().As<IOutputService>();

如本教程中所述，上面的代码可以读取为:将ConsoleOutputService设置为IOutputService的实现

As explained in the tutorial, the code above can be read as: setup ConsoleOutputService as the implementation of IOutputService

在构造函数中具有一个参数的简单类

builder.Register(c => new MultipleOutputService(outputFilePath)).As<IOutputService>();

我不明白为什么我们要使用lambda表达式来注册此类(以及该表达式的作用是什么)以及为什么我们不能键入此代码

I don't understand why are we using a lambda expression to register this class (and what does this expression exactly does) and why we can't type this code

builder.RegisterType<MultipleOutputService(outputFilePath)>().As<IOutputService>();

预先感谢您的帮助

推荐答案

您无法编写该代码，因为它在C#中没有意义.
RegisterType是通用方法；通用方法必须采用 types 作为通用参数.

You can't write that code because it doesn't make sense in C#.
RegisterType is a generic method; generic methods must take types as generic parameters.

您正在尝试使用自定义方式注册类型以创建它(在您的情况下为构造函数参数)； C#支持指定这种事情的唯一方法是lambda表达式(或其他委托).

You're trying to register a type with a custom way to create it (inyour case, a constructor parameter); the only way that C# supports to specify such a thing is a lambda expression (or other delegate).

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