排序IQueryable結果Linq

Question

我有這個查詢返回一個IQueryable結果。

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())); 

我需要這由CreatedOn列（datetime）降序排序。我試圖用這個查詢使用orderbydescending(a => a.CreatedOn)和orderbydescending(a=> a.Key.CreatedOn)，但仍然沒有給出預期的結果。所有幫助讚賞。謝謝！

編輯 - 我曾嘗試

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())); 

這並不正確排序

闖闖

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))); 

它給出了一個錯誤。

Answer 1

如果要通過兩列命令，那麼你可以使用 「OrderByDescending（A => a.column1）」，其次是 「ThenBy（A => a.column2）」 得到想要的結果。