c#泛型或反射——调用未知类的函数

我正在制作一款基于当前Task的工人执行动作的游戏。每个工人将被分配一个任务列表，在一个首选的顺序(这是由玩家的决定影响)。

当一个任务完成时(例如从X到Y)，工作者需要通过检查他们的可能任务列表来启动一个新任务，看看每个任务是否可以执行，如果可以，将他们的当前任务设置为该任务并启动它(最后一个任务-"徘徊"总是可用的)。

我目前使用一个大的开关语句和枚举来工作，但现在想要概括这段代码来创建一个Task类，并给工人一个首选任务列表，一个GetNextTask()函数，并在工人的Update()方法中，调用currentTask.update()(这将使工人在当前任务下做任何他需要做的事情，当任务完成时调用worker.GetNextTask())。

我不清楚的是在工作中存储任务的最佳方式。我应该使用:

1)反射。将可能的任务存储为类型列表，然后使用反射来a)调用静态方法public static virtual bool CanPerformThisTask()，该方法在每个子类中被覆盖，b)为工人创建该任务的实例?(下面的示例代码尝试-但无法测试)

2)实例化所有的任务，每当一个工人需要获得一个新的任务(可能使用Activator)，并检查(Task)task.CanPerformThisTask()为每一个-如果为真，做那个任务。实例化它们似乎效率低下?

3)泛型。这可以用泛型实现吗?如果有，怎么做?

下面是我的类的一个片段，可以让你知道我要做什么:

工人阶级:

protected List<Point> waypoints = new List<Point>();
public bool reachedDestination { get { return waypoints.Count == 0; } }
protected Task task;
public List<Type> possibleTasks;
public Worker(Task initialTask, List<Type> initialPossibleTasks ...)
: base(...)
{
     task = initialTask;
     possibleTasks = initialPossibleTasks;
}
public override void Update()
{
     base.Update();
     if (!reachedDestination) Move();
     task.Update();
}
public void GetNextTask()
{
    foreach (Type t in possibleTasks)
    {
        //reflection code here - will this work and can we do this with generics instead?
        Bool canDoT = (bool)t.GetMethod("CanPerformThisTask", BindingFlags.Static | BindingFlags.Public).Invoke(null, null);
        if (canDoT)
        {
            task = Activator.CreateInstance(t);
            return;
        }
    }
}

下面是我的基本任务类的一些不完整的代码(不应该被实例化):

public class Task
{
    public Worker worker;
    public virtual static bool CanPerformThisTask()
    {
        //never call this from here - always from subclasses
        return false;
    }
    public Task()
    {
        //set up code here
    }
    public virtual void Update()
    {
        //make worker do relevant activities here
        //call finish task when done
    }
    public void FinishTask()
    {
        worker.GetNextTask();
    }
}

，下面是一个任务的例子，工作器将在其可能的任务列表中包含:

public class T_WorkerWander : Task
{
    public static override bool CanPerformThisTask()
    {
        //can always wander (other Tasks will have conditions here)
        return true;
    }
    public T_WorkerWander()
        : base()
    {
    }
    override public void Update()
    {
        //make the worker wander here
        if (worker.reachedDestination) FinishTask();
    }
}

---

更新:这是我现在已经工作的代码

任务类:

public abstract class Task
{
    //the entity holding this task
    public TaskableEntity taskEntity;
    public List<TaskStage> taskStages;
    public TaskStage currentTaskStage { get { return taskStages[0]; } }
    public Task(TaskableEntity t) { taskEntity = t; }
    /// <summary>
    /// the conditions for the Task to be started
    /// </summary>
    public virtual bool CanStart()
    {
        return true;
    }
    public void Start()
    {
        taskStages = new List<TaskStage>();
        InitialiseTaskStages();
        taskStages[0].Start();
    }
    public abstract void InitialiseTaskStages();
    public void Update()
    {
        currentTaskStage.Update();
        if (currentTaskStage.IsComplete()) TaskStageComplete();
    }
    public void TaskStageComplete()
    {
        taskStages.RemoveAt(0);
        if (taskStages.Count == 0) taskEntity.TaskComplete();
        else currentTaskStage.Start();
    }
    public void SetTaskStages(params TaskStage[] t)
    {
        taskStages = t.ToList();
    }
    public void Interrupt()
    {
        currentTaskStage.Interrupt();
    }
}

TaskStage类:

public sealed class TaskStage
{
    private Task task;
    private List<Point> pointsToMoveTo;
    public void SetPointsToMoveTo(Point p) { pointsToMoveTo = new List<Point>() { p }; }
    public void SetPointsToMoveTo(params Point[] p) { pointsToMoveTo = p.ToList(); }
    public void SetPointsToMoveTo(List<Point> p) { pointsToMoveTo = p; }
    public Action actionToApply;
    private float timeToWait;
    public void SetWait(float wait) { timeToWait = wait; }
    private IReservable[] itemsToReserve;
    public void SetItemsToReserve(params IReservable[] items) { itemsToReserve = items; }
    private IReservable[] itemsToUnreserve;
    public void SetItemsToUnreserve(params IReservable[] items) { itemsToUnreserve = items; }
    private Emotion emotionToSet;
    public void SetEmotionToSet(Emotion e) { emotionToSet = e; }
    private TaskStage _interrupt;
    public void SetInterruptAction(TaskStage t) { _interrupt = t; }
    public void Interrupt() { _interrupt.Start(); }
    public TaskStage(Task t)
    {
        task = t;
    }
    public void Start()
    {
        if (actionToApply != null) actionToApply();
        if (itemsToUnreserve != null) UnreserveItems();
        if (itemsToReserve != null) ReserveItems();
        if (pointsToMoveTo != null)
        {
            //this will need changing after pathfinding sorted out...
            if (pointsToMoveTo.Count == 1) task.taskEntity.SetWaypoints(pointsToMoveTo[0]);
            else task.taskEntity.waypoints = pointsToMoveTo;
        }
        if (emotionToSet != null) emotionToSet.StartEmotion();
    }
    public void Update()
    {
        if (timeToWait > 0) timeToWait -= GV.elapsedTime;
    }
    public bool IsComplete()
    {
        if (pointsToMoveTo != null && !task.taskEntity.reachedDestination) return false;
        if (timeToWait > 0) return false;
        return true;
    }
    public void ReserveItems()
    {
        foreach (IReservable i in itemsToReserve)
        {
            i.reserved = true;
        }
    }
    public void UnreserveItems()
    {
        foreach (IReservable i in itemsToUnreserve)
        {
            i.reserved = false;
        }
    }
}

示例任务:

public class T_WorkerGoToBed : Task
{
    public FactoryWorker worker { get { return taskEntity as FactoryWorker; } }
    public T_WorkerGoToBed(TaskableEntity t)
        : base(t) { }
    public override bool CanStart()
    {
        return Room.Available<Bed>(GV.Bedrooms);
    }
    public override void InitialiseTaskStages()
    {
        Bed bedToSleepIn = Room.NearestAvailableFurniture<Bed>(GV.Bedrooms, taskEntity.X, taskEntity.Y);
        //stage 1 - reserve bed and move there
        TaskStage ts1 = new TaskStage(this);
        ts1.SetItemsToReserve(bedToSleepIn);
        ts1.SetPointsToMoveTo(bedToSleepIn.XY);
        //stage 2 - sleep in bed
        TaskStage ts2 = new TaskStage(this);
        ts2.SetWait((worker.maxEnergy - worker.energy) / worker.energyRegeneratedPerSecondWhenSleeping);
        ts2.SetEmotionToSet(new E_Sleeping(worker, false));
        //stage 3 - unreserve bed
        TaskStage ts3 = new TaskStage(this);
        ts3.SetItemsToUnreserve(bedToSleepIn);
        ts3.SetEmotionToSet(new E_Happy(worker, false));
        SetTaskStages(ts1, ts2, ts3);
    }
}

class Worker
{
    bool CanPerformTask<T>() where T : Task
    {
        var type = typeof(T);
        // code to determine whether worker can perform the task T             
    }
    // alternative with instance parameter
    bool CanPerformTask<T>( T task ) where T : Task
    {
        // code to determine whether worker can perform the task passed in
    }
}