Question

我有这个查询返回一个IQueryable结果。

return supplierInvoices.Union(otherInvoices.Join(orders, invoice => invoice.OrderId, order => order.Id, (invoice, order) => new { Order = order, Invoice = (invoice as IReconcilableInvoiceEntity) }))
            .GroupBy(m => m.Order)
            .Where(m => m.Any())
            .Select(m => new KeyValuePair<Order, IQueryable<IReconcilableInvoiceEntity>>(m.Key, m.Select(n => n.Invoice).AsQueryable()));

我需要按CreatedOn列（datetime）的降序对其进行排序。我尝试在此查询中使用orderbydescending(a => a.CreatedOn)和orderbydescending(a=> a.Key.CreatedOn)，但仍未提供预期结果。所有帮助赞赏。谢谢！

编辑 - 我尝试了什么

return supplierInvoices.Union(otherInvoices.Join(orders, invoice => invoice.OrderId, order => order.Id, (invoice, order) => new { Order = order, Invoice = (invoice as IReconcilableInvoiceEntity) }))
            .GroupBy(m => m.Order)
            .Where(m => m.Any())
            .OrderByDescending(m => m.Key.CreatedOn)
            .Select(m => new KeyValuePair<Order, IQueryable<IReconcilableInvoiceEntity>>(m.Key, m.Select(n => n.Invoice).AsQueryable()));

这不正确排序

另一次尝试

return supplierInvoices.Union(otherInvoices.Join(orders, invoice => invoice.OrderId, order => order.Id, (invoice, order) => new { Order = order, Invoice = (invoice as IReconcilableInvoiceEntity) }))
            .GroupBy(m => m.Order)
            .Where(m => m.Any())
            .Select(m => new KeyValuePair<Order, IQueryable<IReconcilableInvoiceEntity>>(m.Key, m.Select(n => n.Invoice).AsQueryable().OrderByDescending(m => m.CreatedOn)));

会出错。

Answer 1

如果您想按两列排序，则可以使用＆＃34; OrderByDescending（a =＆gt; a.column1）＆＃34;其次是＆＃34;的 ThenBy（A =＆GT; a.column2）＆＃34;获得理想的结果。

排序IQueryable结果Linq

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