如何从已声明为接口的基类中获取值?

时间:2013-09-16 19:50:32

标签: c# oop interface abstract-class

这是一款基于OOP的角色扮演游戏。我无法将对象作为接口处理。

abstract class Items
{
   public string name { get; set; }

}

所有项目都有名称,这是我想要获得的属性。

interface Ieatable
{
   int amountHealed { get; set; }
}

会治疗一名球员。

class Healers : Items, Ieatable
{

    private int heal;

    public int amountHealed
    {
        get { return heal; }
        set { heal = value; }
    }

    public Healers(int amount, string name)
    {
        heal = amount;
        base.name = name;
    }

}

这是我处理可食用物品的地方。我查看了玩家背包中的每个项目。然后我检查该物品是否可以食用。然后我正在努力的部分,检查球员背包中的一个项目是否与作为参数传入的可食用项目相同。

public void eatSomethingt(Ieatable eatable)
    {
        foreach (Items i in items ) //Go through every item(list) in the players backpack
        {
            if (i is Ieatable && i.name == eatable.name) //ERROR does not contain definition for name
            {
                Ieatable k = i as Ieatable;
                Console.WriteLine(Name + " ate " + eatable.name); //Same ERROR here.
                life = life + k.amountHealed;
                items.Remove(i);
                break;
            }

        }

    }

3 个答案:

答案 0 :(得分:3)

我会另外定义。

// The base interface for all items.
public interface INamedItem
{
    string Name { get; set; }
}

// all classes are derived from INamedItem, so you can always have the Name property.
public interface IEatable : INamedItem
{
    int AmountHealed { get; set; }
}

public class Healers : Ieatable
{

    public string Name { get; set; }
    public int AmountHealed { get; set; }

    public Healers(int amountHealed, string name)
    {
        AmountHealed = amountHealed;
        Name = name;
    }

}

示例:

public void eatSomethingt(IEatable eatable)
{
    var eatItem = items.OfType<IEatable>.Where( item => item.Name == eatable.Name).FirstOrDefault();

    if (eatItem == null)
        return;

    life = life + eatItem.amountHealed;
    Console.WriteLine(Name + " ate " + eatable.name); //Same ERROR here.
    items.Remove(i);


}

答案 1 :(得分:2)

您无需更改设计,因为其他答案表明您的EatSomething方法有效。只需更改传递的内容类型:

public void eatSomethingt(Healer healer)
{
    foreach (Items i in items)
    {
        if (i is Ieatable && i.name == healer.name)
        {
            Ieatable k = i as Ieatable;
            Console.WriteLine(Name + " ate " + healer.name);
            life = life + k.amountHealed;
            items.Remove(i);
            break;
        }
    }
}

对此答案的警告是,您可能需要IEatable,而不是Item(或Healer)。但是,在这种情况下,您可能没有要比较的名称,因此需要单独的方法。

您传递给方法的IEatable来自哪里?我认为它源于鼠标点击库存项目,因此,您可以这样做:

public void eatSomethingt(Healer item)
{
    Console.WriteLine(Name + " ate " + item.name);
    life = life + item.amountHealed;
    items.Remove(item);
}

答案 2 :(得分:0)

在Items

上创建一个接口
interface IITems
{
    string name { get; set; }
}

abstract class Items : IItems
{ ....

然后在IEatable中使用它

public interface IEatable : IItems
{ ....

然后是治疗师班:

public class Healers : IEatable
{ ...

然后您应该能够访问IEatable类型的名称属性