コルーチンを一括管理するマネージャークラスをつくろうとしたけど、IEnumratorのAPIが少なくて、断念したソース

CoroutineManager.cs

using UnityEngine;
using System.Collections;
using System.Collections.Generic;

public class CoroutineManager : MonoBehaviour {

	private static int coroutineID = 0;
	private Dictionary<int, IEnumerator> _dic;

	public object GretCurrent (int id) 
	{
		IEnumerator cor = GetCoroutine (id);
		if (cor != null) 
		{
			return cor.Current;
		}
	}


	public int Register (IEnumerator coroutine)
	{
		_dic.Add (coroutineID, coroutine);
		coroutineID++;
	}

	public void Pause (int id)
	{
		IEnumerator cor = GetCoroutine (id);
		if (cor != null)
		{
			StopCoroutine (cor);
		}
	}

	void Awake () {
		coroutineID = 0;
		DontDestroyOnLoad (gameObject);
	}

	private IEnumerator GetCoroutine (int id)
	{
		IEnumerator cor = null;
		_dic.TryGetValue (id, out cor);
		return cor;
	}
}