public object?GetNthMask(int index)
            {
                LocationReference_FieldIndex enu = (LocationReference_FieldIndex)index;

                switch (enu)
                {
                case LocationReference_FieldIndex.Actor:
                    return(Actor);

                case LocationReference_FieldIndex.Location:
                    return(Location);

                case LocationReference_FieldIndex.Grid:
                    return(Grid);

                default:
                    throw new ArgumentException($"Index is out of range: {index}");
                }
            }
            public void SetNthMask(int index, object obj)
            {
                LocationReference_FieldIndex enu = (LocationReference_FieldIndex)index;

                switch (enu)
                {
                case LocationReference_FieldIndex.Actor:
                    this.Actor = (Exception?)obj;
                    break;

                case LocationReference_FieldIndex.Location:
                    this.Location = (Exception?)obj;
                    break;

                case LocationReference_FieldIndex.Grid:
                    this.Grid = (Exception?)obj;
                    break;

                default:
                    throw new ArgumentException($"Index is out of range: {index}");
                }
            }