有没有办法用派生的 class 填充基础 class 单例实例？

Question

我有一个基础播放器 class，其中包含一个 Singleton 声明。如果可能的话，我想用 derivedClass 填充 baseClass.Instance var。

我目前的做法是，当 derivedClass "wakes up," 它试图设置 Instance = this;我也试过调用 base.Init()，然后设置 Instance = this;在 base.Init() 方法中。这会设置 Instance != null，但 Instance != derivedClass 也一样。

// Current approach
public abstract class BasePlayer : Entity, IPlayerBase
{
    // Singleton instance, to be populated by the derived class
    private static BasePlayer _i = null;
    private static object _lock = new object();
    private static bool _disposing = false; // Check if we're in the process of disposing this singleton

    public static BasePlayer Instance
    {
        get
        {
            if (_disposing)
                return null;
            else
                return _i;
        }

        protected set
        {
            lock (_lock)
            {
                if(_i == null && !_disposing)
                    _i = value;
            }
        }
    }

    protected void Init()
    {
        if (Instance == null)
        {
            Instance = this;
        }
        else if (Instance != null)
        {
            Active = false;
            Destroy(this.gameObject);
        }

        if (Instance == this)
        {
            Debug.Log("Successfully set BaseClass");
            ...
        }
    }
}

// Current approach
public class FPSPlayer : BasePlayer
{
    void OnEnable()
    {
        base.Init();
    }
}

// Also tried
public class FPSPlayer : BasePlayer
{
    void OnEnable()
    {
        if (Instance == null)
        {
            Instance = this;
        }
        else if (Instance != null)
        {
            Active = false;
            Destroy(this.gameObject);
        }

        if (Instance == this)
        {
            ...
        }
    }
}

Answer 1

使用工厂 class 来 return 您的单例实例。例如

public static class PlayerFactory
{
   private static BasePlayer _instance;

   public static BasePlayer Instance 
   {
      get { return _instance; }
      protected set { _instance = value; }
   } 
}

它应该接受从 BasePlayer 派生的任何对象作为单个实例。

有没有办法用派生的 class 填充基础 class 单例实例？

Is there a way to populate a base class singleton instance with a derived class?

c#

singleton

base-class

derived-class

superclass