我正在尝试替换基类中的派生实例。它适用于动物（抽象类的简单用法），但不适用于泛型。错误在SomeMethod. 有没有干净的解决方案？
编辑：在另一个界面的帮助下，它确实是可行的。用 [S] 注释的代码是我原来问题的解决方案。
public abstract class Animal
{
public void Feed()
{
}
}
public class Tiger:Animal
{
}
public class Dog : Animal
{
}
public class Consumer
{
public Tiger Tiger { get; set; }
public Dog Dog { get; set; }
public Animal FavoriteAnimal { get; set; }
void SomeMethod()
{
// This is fine
FavoriteAnimal = Tiger;
FavoriteAnimal = Dog;
FavoriteAnimal.Feed();
//Also fine
int numberOfDogs = PlaceForDogs.CountAnimals();
int numberOfTigers = PlaceForTigers.CountAnimals();
//[S] This is doable now
FavoritePlaceForAnimals = PlaceForDogs;//[S] no more ERROR
int numberOfAnimalsOnMyFavoritPlace = FavoritePlaceForAnimals.CountAnimals(); // No error, but I do not get here...
}
public PlaceForDogs PlaceForDogs { get; set; } = new PlaceForDogs();
public PlaceForTigers PlaceForTigers { get; set; } = new PlaceForTigers();
//public PlaceForAnimals<Animal> FavoritePlaceForAnimals { get; set; }
//[S] favorite place is of type IPlaceForAnimals instead of PlaceForAnimals
public IPlaceForAnimals FavoritePlaceForAnimals { get; set; }
}
//[S]new interface
public interface IPlaceForAnimals
{
int CountAnimals();
}
//[S]abstract class implements the interface
public abstract class PlaceForAnimals<T>:IPlaceForAnimals where T : Animal
{
public List<T> Animals { get; set; }
public int CountAnimals()
{
//special counting using properties from Animal class
return 0;
}
}
哔哔one
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