Question

4天前我遇到了这个错误，并决定跳过并继续我的应用程序，但我还没有解决方案。我在我的适配器中将此错误System.InvalidCastException: Object must implement IConvertible扩展到我的GetView function中的baseAdapter。

我该怎么做才能解决这个问题？我该如何实施IConvertible？

适配器

  class LocationAdapter: BaseAdapter
  private  JavaList<LocationFinder>findLocation;



  public override View GetView(int position, View convertView, ViewGroup parent)
       {
         LayoutInflater inflater = (LayoutInflater)comment.BaseContext.GetSystemService(Context.LayoutInflaterService);
         View itemView = inflater.Inflate(Resource.Layout.Data,null);
         Name= itemView.FindViewById<TextView>(Resource.Id.getName);
         Level = itemView.FindViewById<TextView>(Resource.Id.getLevel);
         Date = itemView.FindViewById<TextView>(Resource.Id.getDate);



         Name.Text = findLocation[position].Name;//error points here
         Level.Text = findLocation[position].Level;
         Date.Text = findLocation[position].Dates;

         return itemView;

                    }

        public override int Count
        {

            get
            {
                return findLocation.Count;
            }
        }
        public override Java.Lang.Object GetItem(int position)
        {
            return  position;
        }

        public override long GetItemId(int position)
        {
            return position;
        }

LocationFinder

class LocationFinder 
    {
        public string Name { get; set; }
        public string Location { get; set; }
        public string Dates { get; set; }

        public LocationFinder()
        {

        }

        public LocationFinder(string Name, string Location){

            this.Name = Name;
            this.Location = Location;
            Dates = DateTime.Now.ToString("yyyy MMMMM dd);
        }


    }

Answer 1

您从Firebase提取的LocationFinder对象是以Java.Objects形式出现的。无效的强制转换即将到来，因为您尝试对Java.Objects进行操作，就好像它们是LocationFinder对象一样。我建议将它们从你的JavaList或更好的方式投出来，然后在它们进入List时进行投射。

我不是哪种铸件最好的专家，但其中一种应该有用。 findLocation.Add(objectFromFirebase as LocationFinder); findLocation.Add((LocationFinder)objectFromFirebase);

LocationFinder temp = (LocationFinder)findLocation[position]; LocationFinder temp = findLocation[position] as LocationFinder;

ObjectsSystem.InvalidCastException：Object必须实现IConvertible - Xamarin

1 个答案: