[英]MVP view/presenter registration
I'm working on an MVP based GUI architecture for a WinForms application and would like to use Autofac to keep track of the different parts. 我正在为WinForms应用程序开发基于MVP的GUI体系结构,并希望使用Autofac来跟踪不同的部分。 I keep running into circular component dependencies and would appreciate a gentle push in the right direction.
我一直遇到循环组件依赖关系,并希望朝着正确的方向轻轻地推动。
The architecture is based on this post where the View is as passive as i gets. 该架构基于这篇文章,在此文章中,View与我一样被动。 The View holds no reference to the Presenter.
视图不引用演示者。 The View is passed to the Presenter on construction.
视图将在构造时传递给Presenter。 So in the non-DI world you would start your program with:
因此,在非DI世界中,您将使用以下代码启动程序:
var MainView = new MainView();
var mainPresenter = new MainPresenter(mainView, new DataRepository());
Application.Run(mainView);
Ok, so the Presenter needs to know about the View instance to do its job. 好的,因此Presenter需要了解View实例才能完成其工作。 How can I express that in the registration code?
如何在注册码中表达出来? This is what I've tried:
这是我尝试过的:
builder.RegisterType<MainPresenter>().PropertiesAutowired().SingleInstance();
builder.RegisterType<MainView>().As<IMainView>().PropertiesAutowired().SingleInstance();
And then in Program.cs: 然后在Program.cs中:
var mainPresenter = Container.Resolve<MainPresenter>();
Application.Run(Container.Resolve<IMainView>() as MainView);
But this way I need to remember to create the Presenter instance. 但是通过这种方式,我需要记住创建Presenter实例。 However I would like to express in the registration that if I request a IMainView instance the MainPresenter should be kicked into action.
但是,我想在注册中表示,如果我请求IMainView实例,则应将MainPresenter付诸行动。 But how....
但是...
Any hints, mockery or derisive laughter are welcome 任何暗示,嘲弄或嘲笑的欢迎
I think you should be able to solve it this way: Register the presenter and view without property injection since you say the view needs no reference to the presenter, and constructor injection is considered best practice in Autofac: 我认为您应该可以这样解决:注册演示者和视图而无需注入属性,因为您说视图不需要引用演示者,并且构造函数注入被认为是Autofac的最佳实践:
builder.RegisterType<MainPresenter>().SingleInstance();
builder.RegisterType<MainView>().As<IMainView>();
Inject the view into the presenter through constructor and publish it as a readonly property: 通过构造函数将视图注入到presenter中,并将其发布为只读属性:
public class MainPresenter
{
// Private variables
private readonly IMainView _view;
// Constructor
public MainPresenter(IMainView view)
{
_view = view;
}
// Properties
public IMainView View
{
get { return _view; }
}
}
Then you fire up the application through a single resolve: 然后,您通过一个解决方案启动应用程序:
var mainPresenter = Container.Resolve<MainPresenter>();
Application.Run(mainPresenter.View as Form);
Finally, if you find later on that you need a reference from the view to the presenter, I think you would have to use property-injection on the view to avoid circular reference exceptions. 最后,如果以后发现您需要从视图到演示者的引用,我认为您必须在视图上使用属性注入以避免循环引用异常。 Then you can register the view like this:
然后,您可以像这样注册视图:
builder.RegisterType<MainView>().As<IMainView>().PropertiesAutowired(PropertyWiringFlags.AllowCircularDependencies);
and supply the view with a read/write property that will be set by Autofac 并为视图提供由Autofac设置的读/写属性
public MainPresenter Presenter { get; set; }
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