[英]How to create a factory containing controllers that contain the factory
我正在嘗試創建一個工廠,該工廠將在字典中保存“子”控制器的列表。 這些子控制器必須包含工廠,以便它們可以訪問其他子控制器。 這是工廠:
public interface IChildControllerFactory
{
IChildController GetChildController(object item);
}
public class ChildControllerFactory : IChildControllerFactory
{
private Dictionary<string, IChildController> _childControllerDictionary;
public ChildControllerFactory(IEnumerable<IChildController> childControllers)
{
var childControllerDictionary = new Dictionary<string, IChildController>();
//code to build dictionary
_childControllerDictionary = childControllerDictionary;
}
public IChildController GetChildController(object item)
{
return _childControllerDictionary.Where(x => x.Key == item.GetType().Name).Select(x => x.Value).First();
}
}
這是一個子控制器的示例:
public class ChildController : Controller, IChildController<TViewModel, TModel>
{
private IChildControllerFactory _childControllerFactory;
public ChildController(IChildControllerFactory childControllerFactory) //this will cause a circular reference
{
_childControllerFactory = childControllerFactory;
}
public ActionResult GetChildViewModel(object child)
{
var model = _childControllerFactory.GetChildController(child).ToViewModel(survey);
return PartialView("Child.ascx", model);
}
}
和繼承的接口:
public interface IChildController<TViewModel, TModel>
{
int Create(object item);
object Save(object item);
object ToViewModel(object item);
}
子控制器均已注冊,並且工廠指定為帶有結構圖的Singleton。
因為子控制器需要工廠,所以使用依賴注入在構造函數中設置工廠將導致循環引用,因為第一次初始化工廠時,它將初始化所有子控制器,並且每個子控制器都將嘗試初始化工廠(已經在執行)。
如何使工廠實例化所有子控制器,然后從這些子控制器進行訪問?
讓我們考慮一下。 childController
僅在分配了工廠權限后才能工作嗎? 因此,在創建childFactory
之前,childControll實際上是無用的。 那就是說我會做類似的事情:
public class ChildController : Controller, IChildController<TViewModel, TModel>
{
private IChildControllerFactory _childControllerFactory;
public ChildController()
{
}
public void setChildControllerFactory( IChildControllerFactory childControllerFactory )
{
_childControllerFactory = childControllerFactory;
}
public ActionResult GetChildViewModel(object child)
{
var model = _childControllerFactory.GetChildController(child).ToViewModel(survey);
return PartialView("Child.ascx", model);
}
}
所以您的ChildControllerFactory
將類似於:
public ChildControllerFactory(IEnumerable<IChildController> childControllers)
{
var childControllerDictionary = new Dictionary<string, IChildController>();
_childControllerDictionary = childControllerDictionary;
for(IChildController i in _childControllerDictionary) i.setChildControllerFactory(this);
}
我沒有對其進行測試,但是我看不到具體對象在工廠中傳遞工廠的必要性,因為您將這些對象的字典存儲在工廠中。
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