Question

以下是什么意思？

Union或Concat中的类型具有按不同顺序分配的成员

我试图连接两个子类并在列表中对它们进行排序，但是我得到了这个错误。我的代码看起来像这样。我更喜欢对错误的解释，但对此的解决方案也将受到赞赏。

    public List<InterfaceItem> GetTransactions(string id)
    {
        DataClasses1DataContext context = new DataClasses1DataContext();

        var tollQuery = from t in context.Tolls
                        where t.account_id.Equals(id)
                        select new TollTest { Date = t.status_time, Amount = t.fee, Plate = t.plate_id };
        var paymentQuery = from p in context.Payments
                           where p.account_id.Equals(id)
                           select new PaymentTest { Date = p.status_time, Amount = p.payment1, PaymentMethod = p.credit_type };

        IQueryable<InterfaceItem> toll = tollQuery;
        IQueryable<InterfaceItem> payment = paymentQuery;

        var all = (toll.Concat(payment)).ToList();
        return all;
    }

Answer 1

从Nikki9696的灵感来看，我想通了。我使用TollTest和PaymentTest作为InterfaceItem的子类。最后，我删除了子类，而是执行了以下操作：

        var tollQuery = from t in context.Tolls
                        where t.account_id.Equals(id)
                        select new InterfaceItem { Date = t.status_time, Amount = t.fee, PaymentMethod = null,  Plate = t.plate_id };
        var paymentQuery = from p in context.Payments
                           where p.account_id.Equals(id)
                           select new InterfaceItem { Date = p.status_time, Amount = p.payment1, PaymentMethod = p.credit_type, Plate = null };

只有在我使用基类变量，即

时才能成功使用子类

            var tollQuery = from t in context.Tolls
                        where t.account_id.Equals(id)
                        select new TollTest { Date = t.status_time, Amount = t.fee};
        var paymentQuery = from p in context.Payments
                           where p.account_id.Equals(id)
                           select new PaymentTest { Date = p.status_time, Amount = p.payment1};

因此，如果您遇到此错误，则应确保您具有相同的变量名称，而不仅仅是其类型。

什么和＃34; Union或Concat中的类型以不同的顺序分配成员＆＃34;意思？

1 个答案: