從子類訪問隱藏的屬性

Question

有時在C＃中，隱藏繼承的基類的屬性很有用，例如，當您想更改類型時。 但是，一旦隱藏了繼承的屬性，我將不知道如何讀取或寫入隱藏屬性的值。

這是一個使用動物和狗的小例子：

public enum DogBreed {
    Corgi, Pug
}
public class Animal {
    public string Breed { get; set; }
}
public class Dog : Animal {
    public new DogBreed? Breed {
        get {
            // Not working since "Breed" now refers to Dog.Breed not Animal.Breed
            if (Breed == "Corgi") return DogBreed.Corgi;
            if (Breed == "Pug") return DogBreed.Pug;
            return null;
        }
        set {
            // Also Not working for same reason as above
            if (value == DogBreed.Corgi) Breed = "Corgi";
            else if (value == DogBreed.Pug) Breed = "Pug";
            else Breed = null;
        }
    }
}

如何訪問隱藏的屬性？ （動物品種）

Answer 1

您正在尋找base關鍵字：

public class Dog : Animal {
    public new DogBreed? Breed {
        get {
            // base.Breed refers to the hidden property
            if (base.Breed == "Corgi") return DogBreed.Corgi;
            if (base.Breed == "Pug") return DogBreed.Pug;
            return null;
        }
        set {
            if (value == DogBreed.Corgi) base.Breed = "Corgi";
            else if (value == DogBreed.Pug) base.Breed = "Pug";
            else base.Breed = null;
        }
    }
}