Question

我有两个类，Character和Npc，它们都继承自一个名为'Actor'的基类。考虑以下两种基本相同的方法：

public static Dictionary<uint, Npc> drawnNpcs = new Dictionary<uint, Npc>();
public static Dictionary<uint, Character> drawnCharacters = new Dictionary<uint, Character>();

private GameObject DrawCharacter(ActorWrapper actorToDraw)
{
    GameObject obj;
    if (Data.drawnCharacters.ContainsKey(actorToDraw.Id))
    {
        Character character;
        Data.drawnCharacters.TryGetValue(actorToDraw.Id, out character);
        obj = character.gameObject;
        obj.SetActive(true);
    }
    else
    {
        obj = new GameObject("Actor");
        Character character = obj.AddComponent<Character>();
        character.Id = actorToDraw.Id;
        Data.drawnCharacters.Add(character.Id, character);
    }
    return obj;
}

private GameObject DrawNpc(ActorWrapper actorToDraw)
{
    GameObject obj;
    if (Data.drawnNpcs.ContainsKey(actorToDraw.Id))
    {
        Npc npc;
        Data.drawnNpcs.TryGetValue(actorToDraw.Id, out npc);
        obj = npc.gameObject;
        obj.SetActive(true);
    }
    else
    {
        obj = new GameObject("Actor");
        Npc npc = obj.AddComponent<Npc>();
        npc.Id = actorToDraw.Id;
        Data.drawnNpcs.Add(npc.Id, npc);
    }
    return obj;
}

我试图实现一个泛型方法，它接受一个通用的Dictionary来尝试将这两个方法合并在一起。（我甚至不确定这是否会起作用，这只是一个天真的第一次尝试）

private GameObject GetDrawnActor<T>(Dictionary<uint, T> drawnActors, ActorWrapper actorToDraw) where T : Actor
{
    if (drawnActors.ContainsKey(actorToDraw.Id))
    {
        T actor;
        drawnActors.TryGetValue(actorToDraw.Id, out actor);
        GameObject obj = actor.gameObject;
        obj.SetActive(true);
        return obj;
    }
    else
    {
        GameObject obj = new GameObject("Actor");
        var actor = obj.AddComponent<typeof(T)>(); //how do i do this??
        actor.Id = actorToDraw.Id;
        drawnActors.Add(actor.Id, actor);
        return obj;
    }
}

注释行是失败的地方。我已经看过类似的问题了，唯一的另一个选择是使用反射。有没有办法在没有反射的情况下做到这一点，而只是在设计中只有一个重构？

编辑：真是愚蠢的解决方案！我修改了代码是正确的，除了答案给出的违规行

Answer 1

我认为你唯一需要做的就是替换它：

Character character = obj.AddComponent<typeof(T)>();

用这个：

Character character = obj.AddComponent<T>();

如何将泛型类型传递给新的通用对象？

1 个答案: