在 C# 中使用嵌套泛型类时的继承问题 [英] Issue with Inheritance when using nested Generic classes in C#

问题描述

我正在尝试创建一个类层次结构，以便我可以拥有:

I'm trying to create a class hierarchy such that I can have:

SpecificScreenController

屏幕控制器单身

SpecificScreenController < ScreenController < Singleton

到目前为止，我已将这些设置为:

So far I have these set up as:

public abstract class Singleton<T> : MonoBehaviour where T : MonoBehaviour
{
    private static T _instance;
    public static T Instance{ get{... return _instance;} }
}

public abstract class ScreenController<T> : Singleton<T> where T : MonoBehaviour
{
    public GAME_SCREEN GameScreen;
    //many more ScreenController common properties/fields/methods
}

public class SpecificScreenController : ScreenController<SpecificScreenController> 
{
    //subclass specific properties, overriden ScreenController methods etc.
}

这样我就可以使用 SpecificScreenController.Instance.GameScreen; 到目前为止，这很好用.

This way I can use SpecificScreenController.Instance.GameScreen; This works, so far, so good.

我现在想要做的是，例如:

What I want to now do with this is, for instance:

List<ScreenController> screenControllers = new List<ScreenController>();
screenControllers.Add(SpecificScreenController.Instance);
ScreenController s = screenControllers.Find(i => i.GameScreen == GAME_SCREEN.THING);

但是，当然......这不会编译，因为 ScreenController 现在需要一个通用类型等.我可以/应该使用什么习语来保留单例行为和 ScreenController 子/超类?

But, of course ... this won't compile because ScreenController now requires a Generic Type etc. What idiom can/should I use to preserve the Singleton behavior and ScreenController sub/superclasses ?

推荐答案

由于这个问题似乎没有真正干净的解决方案，我最终从我的类层次结构中删除了单例，并复制粘贴了单例属性的非通用版本获取/实例化代码到我想要成为单例的每个类中.

As there seem to be no really clean solutions to this issue I ended up removing Singleton from my class hierarchy and copy-pasted non-generic versions of the singleton property get/instantiate code into each of the classes that I wanted to be singletons.

public abstract class ScreenController : MonoBehaviour
{
}

public class SpecificScreenController : ScreenController
{
    private static SpecificScreenController _instance;
    public static SpecificScreenController Instance{ get{... return _instance;} 
}

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