var _pool = new Dictionary<Type, Dictionary<EntityIdType, Object>>();
public IEnumerable<EntityType> GetItems<EntityType>()
{
Type myType = typeof(EntityType);
if (!_pool.ContainsKey(myType))
return new EntityType[0];
//does not work, always returns null
// return _pool[myType].Values; as IEnumerable<EntityType>;
//hack: cannot cast Values to IEnumarable directly
List<EntityType> foundItems = new List<EntityType>();
foreach (EntityType entity in _pool[myType].Values)
{
foundItems.Add(entity);
}
return foundItems as IEnumerable<EntityType>;
}
最佳答案
尝试这个:
return _pool[myType].Values.Cast<EntityType>();
这具有强制转换枚举中的每个元素的效果。