public partial class MainForm : BaseForm //修改父类 Form 为 BaseForm

table.NotifyDataSetChanged();

//需要配合自定义适配器使用，继承 BaseAdapter：
//重写 OnCreateViewHolder(Control control, int offset, int position)
//     OnDrawItem(Graphics g, ViewHolder viewHolder, int position)
public class ContactsAdapter : BaseAdapter<ContactsViewModel>{

   public override ViewHolder OnCreateViewHolder(Control control, int offset, int position)
   {
      ViewHolder viewHolder = GetViewHolder(position);
      y = position * ITEM_HEIGHT;
      if (viewHolder == null)
       {
            viewHolder = new ViewHolder(control, new Rectangle(x, y + offset, control.Width, ITEM_HEIGHT), position);
            CacheViewHolder(viewHolder);//缓存 ViewHolder
        }
        else
        {
            viewHolder.Bounds = new Rectangle(x, y + offset, control.Width, ITEM_HEIGHT);
        }
      return viewHolder;
   }

   public override void OnDrawItem(Graphics g, ViewHolder viewHolder, int position)
   {
        ContactsViewModel viewModel = GetItem(position);
        //...
   }
   

}