Reusable Xamarin.Android RecycledViewPool

RecycledViewPool.cs

class RecycledViewPool
{
  public delegate ViewHolder Factory(ViewGroup parent, int viewType);

  // A stack has a O(1) add/remove, so better than a list
  Dictionary<int, Stack<ViewHolder>> pool;
  Factory factory;

  public RecycledViewPool(Factory factory)
  {
    this.pool = new Dictionary<int, Stack<ViewHolder>>();
    this.factory = factory;
  }

  public ViewHolder GetRecycledView(ViewGroup parent, int viewType)
  {
    Stack<ViewHolder> recycledViews = GetOrCreatePool(viewType);

    if (recycledViews.Count > 0)
    {
      return recycledViews.Pop();
    }
    else
    {
      return factory(parent, viewType);
    }
  }

  public void Recycle(ViewHolder holder)
  {
    var recycledViews = GetOrCreatePool(holder.ViewType);
    recycledViews.Push(holder);
  }

  Stack<ViewHolder> GetOrCreatePool(int viewType)
  {
    Stack<ViewHolder> recycledViewList;

    if (!pool.TryGetValue(viewType, out recycledViewList))
    {
      recycledViewList = new Stack<ViewHolder>();
      pool.Add(viewType, recycledViewList);
    }

    return recycledViewList;
  }
}

ViewHolder.cs

abstract class ViewHolder
{
  public int ViewType { get; private set; }
  public View ItemView { get; private set; }

  public ViewHolder(View itemView, int viewType)
  {
    ItemView = itemView;
    ViewType = viewType;
  }
}