C#中的工厂模型而不使用默认构造函数

public interface IAnimal
{
    void MakeSound();
}

public class Dog : IAnimal
{
    public void MakeSound()
    {
        Console.WriteLine("Woof!");
    }
}

public class Cat : IAnimal
{
    public void MakeSound()
    {
        Console.WriteLine("Meow!");
    }
}

public class AnimalFactory
{
    public static IAnimal CreateAnimal(string animalType)
    {
        if (animalType == "dog")
        {
            return new Dog();
        }
        else if (animalType == "cat")
        {
            return new Cat();
        }
        else
        {
            throw new ArgumentException("Invalid animal type");
        }
    }
}

public class Program
{
    public static void Main(string[] args)
    {
        IAnimal dog = AnimalFactory.CreateAnimal("dog");
        dog.MakeSound();

        IAnimal cat = AnimalFactory.CreateAnimal("cat");
        cat.MakeSound();
    }
}