C# 如何创建采用泛型基类型的方法

我有类似于以下内容的内容，但我无法向

printshelteradress

方法提供

House

或

Farm

对象：

public interface IAnimal { };
public interface IDomesticAnimal : IAnimal { };
public interface IHouseAnimal : IDomesticAnimal { };
public interface IFarmAnimal : IDomesticAnimal { };

public class Animal : IAnimal { }
public class DomesticAnimal : Animal, IDomesticAnimal { }
public class Lion : Animal { }
public class Cat : DomesticAnimal, IHouseAnimal { }
public class Horse : DomesticAnimal, IFarmAnimal { }

public interface IAnimalShelter<T> where T : IDomesticAnimal { String Address { get; set; } };
public interface IHouse : IAnimalShelter<IHouseAnimal> { };
public interface IFarm : IAnimalShelter<IFarmAnimal> { };

public class AnimalShelter<T> : IAnimalShelter<T> where T : IDomesticAnimal { public String Address { get; set; } }
public class House : AnimalShelter<IHouseAnimal>, IHouse { }
public class Farm : AnimalShelter<IFarmAnimal>, IFarm { }

class Program
{
    static void Main(string[] args)
    {
        PrintShelterAddress(new House() { Address = "MyHouse" });  // Error: argument type 'House' is not assignable to parameter type 'IAnimalShelter<IDomesticAnimal>'

        // This makes sense as House is a IAnimalShelter<IHouseAnimal>
        // and IHouseAnimal cannot be cast to its parent IDomesticAnimal
        IAnimalShelter<IDomesticAnimal> nonDescriptShelter = new House();  // InvalidCastException: Unable to cast object of type 'House' to type 'IAnimalShelter`1[IDomesticAnimal]'.
    }

    static void PrintShelterAddress(IAnimalShelter<IDomesticAnimal> nonDescriptShelter)
    {
        Console.WriteLine(nonDescriptShelter.Address as string);
    }
}

这很管用，但我不喜欢使用

动态

我的最佳解决方案：

static void PrintShelterAddress(dynamic nonDescriptShelter)
{
    Console.WriteLine(nonDescriptShelter.Address);
}

将非通用基本接口添加到IAnimalShelter，并使用该接口：

public interface IAnimalShelter { String Address { get; set; } };
public interface IAnimalShelter<T> : IAnimalShelter where T : IDomesticAnimal { };

static void PrintShelterAddress(IAnimalShelter nonDescriptShelter) { ... }

公共接口IAnimalShelter{String Address{get；set；}；
公共接口IAnimalShelter:IAnimalShelter，其中T:IDomesticAnimal{}；
静态无效打印ShelterAddress（IAnimalShelter nonDescriptShelter）{…}

所以…

---

有没有比使用

dynamic

或向

IAnimalShelter

添加基本接口更好的解决方案？

Hmm。。尝试使您的接口协变：

public interface IAnimalShelter<out T> : .....

公共接口IAnimalShelter:。。。。。

public interface IAnimalShelter<out T> : .....