Recycler视图notifyDataSetChange无法使用自定义适配器

Question

我有一个客户名单。第一次与所有客户一起呈现，然后我添加了一个过滤器，仅列出新客户。使用新客户修改了源项目。但它没有在视图中呈现。使用新的数组集调用适配器构造函数。但它没有调用方法public override int ItemCount。此页面将在屏幕锁定和设备解锁时呈现。请帮帮我

public class RecyclerViewRenderer : ViewRenderer<RecyclerViewList, RecyclerView>
{ 
.........
protected override void OnElementPropertyChanged(object sender, System.ComponentModel.PropertyChangedEventArgs e)
{
base.OnElementPropertyChanged(sender, e);

        if (e.PropertyName == RecyclerViewList.ItemsProperty.PropertyName)
        {
            var items = (Element as RecyclerViewList).Items;
            if (items != null)
            {
                adapter = new RecyclerViewAdapter(items);
                adapter.ItemClickEvent += OnItemClick;
                adapter.PopUpClickEvent += OnPopUpClick;
                recyclerViewCustomers.SetAdapter(adapter);


                adapter.NotifyDataSetChanged();
               // Task.Delay(500);


            }
        }
    }
......
}