小编zer*_*doc的帖子

当我尝试将对象添加到对象内的列表时,即使对象的所有属性都包含数据,我仍然会收到NullReferenceException.Classes--

public class OrderInfo
    {
        public virtual string OrderNum { get; set; }
        public virtual string TrackingNum { get; set; }
        public virtual DateTime Shipdate { get; set; }
        public virtual string Cost { get; set; }
        public virtual string ShipMethod { get; set; }
        public virtual string ShipService { get; set; }
        public virtual string Country { get; set; }
        public virtual decimal Weight { get; set; }
        public virtual List<OrderItemInfo> OrderiTems { get; set; }

        public void AddShipmentItem(OrderItemInfo …