[英]How do I get access to getters and setters from a separate class to the main class(with downcasting in C#)
我知道如何在Java中執行此操作,但是C#無法正常工作。 我確定我缺少明顯的東西。 如您所見,如果寵物不是狗,我想將寵物降為狗。 我認為垂頭喪氣是對的,但也許並非如此。 問題是該行Console.WriteLine("{0,12}\\t {1}\\t {2,10:C}\\t {3}\\t {4}", Name, Type, Price, Weight, Sound(), AKCRegistration);
它不允許我訪問我所指的吸氣劑。
這是我的主班
static void Main(string[] args)
{
Pet[] pets = new Pet[5];
pets[0] = new Dog("King", 55, PET_TYPE.Canine, "akc1000", 1000);
pets[1] = new Dog("Princess", 25, PET_TYPE.Canine, "akc1000", 2000);
pets[2] = new Dog("Spike", 25, PET_TYPE.Canine, "akc1000", 25);
pets[3] = new Cat("Missy", 15, PET_TYPE.Feline, 50);
pets[4] = new Cat("Mr Boogangle", 5, PET_TYPE.Feline, 30);
//for (int i = 0; i < pets.Length; i++)
//{
// Console.WriteLine($"{pets[i]}");
//}
for each (Pet pet in pets)
{
if (pet is Dog)
{
Dog Pet = (Dog) pet;
Console.WriteLine("{0,12}\t {1}\t {2,10:C}\t {3}\t {4}", Name, Type, Price, Weight, Sound(), AKCRegistration);
}
}
這是我的狗班
class Dog: Pet
{
private string aKCregistration;
public Dog(string name, int weight, PET_TYPE type, string AKC, double price) : base(name, weight, type, price)
{
this.aKCRegistration = AKC;
if (aKCRegistration == "")
{
aKCRegistration = "Mutt";
}
}
public int AKCRegistration { get; set; }
public override string Sound()
{
return "Woof, Woof";
}
public override string ToString()
{
return String.Format("{0,12}\t {1}\t {2,10:C}\t {3}\t {4}", Name, Type, Price, Weight, Sound());
}
}
我的寵物班
public enum PET_TYPE
{
Canine, Feline
}
public abstract class Pet
{
internal string name;
internal int weight;
internal PET_TYPE type;
internal double price;
public Pet(string name, int weight, PET_TYPE type, double price)
{
this.name = name;
this.weight = weight;
this.type = type;
this.price = price;
}
public string Name
{
get { return name; }
set { name = value; }
}
public int Weight
{
get { return weight; }
set { weight = value; }
}
public double Price
{
get { return price; }
set { price = value; }
}
public PET_TYPE Type
{
get { return type; }
set { type = value; }
}
public override string ToString()
{
return String.Format("{0,12}\t {1}\t {2,10:C}\t {3}\t {4}", Name, Type, Price, Weight, Sound());
}
public abstract string Sound();
} // end class pet
除貓類外,我還包括其他所有內容,如果您需要查看,請告訴我。
在這種情況下,您不是使用實例變量Pet
來引用它們的,因為您是從類外部訪問它們的,因此需要在它們上指定實例變量以告知您正在訪問哪個對象的狀態,例如:
Console.WriteLine("{0,12}\t {1}\t {2,10:C}\t {3}\t {4}",
Pet.Name,
Pet.Type,
Pet.Price,
Pet.Weight,
Pet.Sound(),
Pet.AKCRegistration);
當您已經在Dog
覆蓋了ToString
成員函數時,您也可以像這樣調用它:
string petString = Pet.ToString();
當您訪問Dog
類中的對象時,意味着您正在引用當前對象,無論哪個對象正在調用ToString
方法,這樣它就可以在不顯式指定任何實例的情況下工作,您可以認為它類似於:
Console.WriteLine("{0,12}\t {1}\t {2,10:C}\t {3}\t {4}",
this.Name,
this.Type,
this.Price,
this.Weight,
this.Sound(),
this.AKCRegistration);
但是我們不需要顯式添加this
因為編譯器會解決這個問題。
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