简单的喷油器：在基类中注入一个属性 [英] Simple Injector: Injecting a property in a base class

问题描述

有关几个星期我一直在使用href=\"https://simpleinjector.org\" rel=\"nofollow\">简单的注射器依赖注入容器，大获成功的

For several weeks I've been using the Simple Injector dependency injection container, with great success. I love the easy by which I can configure it. But now I have a design that I don't know how to configure. I have a base class where many types from derive, and I want to inject a dependency into a property of the base class, but without having to configure that for every derived class. I tried to do this with attributes, but Simple Injector does not support attributes. Here is a trimmed down version of my design.

public interface Handler<TMessage> where TMessage : Message
{
    void Handle(TMessage message);
}

public abstract class BaseHandler
{
    // This property I want to inject
    public HandlerContext Context { get; set; }
}

// Derived type
public class NotifyCustomerHandler : BaseHandler,
    Handler<NotifyCustomerMessage>
{
    public NotifyCustomerHandler(SomeDependency dependency)
    {
    }

    public void Handle(NotifyCustomerMessage message)
    {
    }
}

我的配置现在看起来是这样的：

My configuration now looks like this:

container.Register<HandlerContext, AspHandlerContext>();
container.Register<Handler<NotifyCustomerMessage>, NotifyCustomerHandler>();
// many other Handler<T> lines here

我怎么能注入在BaseHandler财产？

How can I inject the property in the BaseHandler?

在您的帮助谢谢

推荐答案

简单喷油器的物业注入文档提供了有关这是一个非常明确的解释。基本的选项是：

The Simple Injector documentation on property injection gives a very clear explanation about this. The basic options are:

• 使用注册一个初始化委托 RegisterInitializer


• 覆盖简单的喷油器的 PropertySelectionBehavior 。

• Register an initialization delegate using RegisterInitializer.
• Override Simple Injector's PropertySelectionBehavior.

由于文件解释说，使用 RegisterInitializer 不建议对房地产的依赖注射;仅在配置值。

As the documentation explains, the use of RegisterInitializer is not advised for property injection on dependencies; only on configuration values.

这让你有压倒一切的简单喷油器的 PropertySelectionBehavior ，但其本身不具有一个基类气味像一个坚实的冲突。请看看下面的文章。它描述了为什么有一个基类可能是一个坏主意，文章提出了一个解决方案。

This leaves you with overriding Simple Injector's PropertySelectionBehavior, but having a base class by itself smells like a SOLID violation. Please take a look at the following article. It describes why having a base class might be a bad idea and the article presents a solution for this.

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