基础类中的Autofac属性注入 [英] Autofac property injection in base class

问题描述

我正在使用Windows Phone 8.1应用程序，并且具有具有公共属性的基类.

I am working on a Windows Phone 8.1 application and I have a base class with public property.

public class ViewModelBase
{
   public ISomeClass MyProp {get;set;}
}

我的派生类如下

public class MainViewModel : ViewModelBase
{
    private readonly INavigation _navigation;
    public MainViewModel(INavigation navigation)
    {
        _navigation = navigation;
    }
}

在我的App.cs中，我有

In my App.cs I have

 var builder = new ContainerBuilder();
 builder.RegisterType<Navigation>().As<INavigation>();
 builder.RegisterType<SomeClass>().As<ISomeClass>();
 builder.RegisterSource(new AnyConcreteTypeNotAlreadyRegisteredSource());

创建MainViewModel时，我的INavigation已解决，但MyProp为空.我尝试过

When MainViewModel is created my INavigation is resolved but MyProp is null. I have tried

builder.Register(c => new ViewModelBase { MyProp = c.Resolve<ISomeClass>() });

builder.Register(c => new ViewModelBase()).OnActivated(e => e.Instance.MyProp = e.Context.Resolve<ISomeClass>());

builder.RegisterType<ViewModelBase>().PropertiesAutowired();

但没有一个起作用！

解决方案在这里发布 http://bling.github.io/blog/2009/09/07/member-injection-module-for-autofac/

有效，但我不喜欢它:)

works but I don't like it :)

在这种情况下，我不想使用构造函数注入.

I don't want to use constructor injection in this case.

谢谢.

推荐答案

您必须确保您的viewmodel类 MainViewModel 已在属性注入中注册.当前，您向属性注入注册的所有内容都是 ViewModelBase ，但请考虑一下您正在解析.您永远都不会解析 ViewModelBase ，而是要解析 MainViewModel .这就是需要在容器中注册的内容.

You must make sure that your viewmodel class, MainViewModel, is registered with property injection. Currently, all you have registered with property injection is ViewModelBase, but think about what you are resolving. You will never resolve ViewModelBase, you're resolving MainViewModels. So that is what needs to be registered in the container.

尝试:

builder.RegisterType<MainViewModel>().PropertiesAutowired();

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