从 C# 中的泛型引用调用派生类重写方法

发布于 2024-12-16 11:55:10 字数 668 浏览 1 评论 0原文

我正在构建一个游戏，并且有基本的继承层次结构：

GameObject 是一个基类，有一个名为 Clone 的虚拟方法

PlatformObject 派生自GameObject，重写 Clone 方法

我有一个针对任何 GameObject 的序列化器/反序列化器泛型类或定义如下的派生类：

public 类XmlContentReaderBase其中 T : GameObject

我的 XML Reader 类不知道我的派生类型。我对这一行有一个问题：

        T obj = serializer.Deserialize(input) as T;
        return obj.Clone() as T;

第一行运行良好，并返回一个正确的 PlatformObject 。但第二行调用了基类GameObject的Clone方法，这不是我想要的。我需要调用 PlatformObject.Clone 方法，如何完成此操作？

谢谢，能。

原文

I'm building a game and there is basic inheritance hiearchy:

GameObject is a base class, has a virtual method called Clone

PlatformObject is derived from GameObject, overriding the Clone method

I have a serializer/deserializer generic class for any GameObject or derivations defined as below:

public class XmlContentReaderBase<T> where T : GameObject

My XML Reader class is unaware of my derived type. I've got a problem with this line:

        T obj = serializer.Deserialize(input) as T;
        return obj.Clone() as T;

The first line runs fine, and returns a PlatformObject which is correct. But the second line calls the Clone method of the base class, GameObject, which is not what I want. I need to call PlatformObject.Clone method, how can I get this done?

Thanks,
Can.

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烟柳画桥 2024-12-23 11:55:10

我编写了一个与此非常接近的实现，并看到 Clone 引用派生对象的 Clone 方法（通过创建一个新对象而不是反序列化对象有点作弊）。

发布更多代码？

using System.Text;

namespace GenericExperiment
{
    class Program
    {
        static void Main(string[] args)
        {
            XmlContentReaderBase<PlatformObject>.Deserialize();
            Console.ReadKey();
        }
    }

    class GameObject : ICloneable
    {
        object ICloneable.Clone()
        {
            Console.WriteLine("I am the base class");
            return null;
        }
    }

    class PlatformObject: GameObject, ICloneable
    {
        object ICloneable.Clone()
        {
            Console.WriteLine("I am the derived class");
            return null;
        }
    }

    class XmlContentReaderBase<T> where T : GameObject, new()
    {
        static public object Deserialize()
        {
            T obj = new T();
            ((ICloneable)obj).Clone();
            return obj;
        }
    }

}

输出：

我是派生类

I wrote an implementation very close to this and see Clone referencing the derived object's Clone method (cheated a bit by creating a new object rather than deserializing one).

Post more code?

using System.Text;

namespace GenericExperiment
{
    class Program
    {
        static void Main(string[] args)
        {
            XmlContentReaderBase<PlatformObject>.Deserialize();
            Console.ReadKey();
        }
    }

    class GameObject : ICloneable
    {
        object ICloneable.Clone()
        {
            Console.WriteLine("I am the base class");
            return null;
        }
    }

    class PlatformObject: GameObject, ICloneable
    {
        object ICloneable.Clone()
        {
            Console.WriteLine("I am the derived class");
            return null;
        }
    }

    class XmlContentReaderBase<T> where T : GameObject, new()
    {
        static public object Deserialize()
        {
            T obj = new T();
            ((ICloneable)obj).Clone();
            return obj;
        }
    }

}

Output: