zszq-trs/YLErpDAL/Modules/TradeModule/QueryModule/TradeConfirmationDocumentQuery.cs

namespace YLErp.Modules.TradeModule.QueryModule
{
    public sealed class TradeConfirmationDocumentQueryItem
    {
        public trade_contract_document Document { get; set; }

        public trade_contract_r Relation { get; set; }
    }

    public static class TradeConfirmationDocumentQuery
    {
        public static IQueryable<TradeConfirmationDocumentQueryItem> Create(
            IQueryable<trade_contract_document> documents,
            IQueryable<trade_contract_r> relations,
            IQueryable<trade> trades,
            DateTime? tradeDateStart,
            DateTime? tradeDateEnd)
        {
            if (tradeDateStart.HasValue)
            {
                trades = trades.Where(t => t.TradeDate >= tradeDateStart.Value);
            }

            if (tradeDateEnd.HasValue)
            {
                var tradeDateEndExclusive = tradeDateEnd.Value.Date.AddDays(1);
                trades = trades.Where(t => t.TradeDate < tradeDateEndExclusive);
            }

            return from document in documents
                   join relation in relations.Where(r => r.IsValid)
                       on document.Code equals relation.ContractCode
                   join trade in trades
                       on relation.TradeId equals trade.id
                   select new TradeConfirmationDocumentQueryItem
                   {
                       Document = document,
                       Relation = relation
                   };
        }
    }
}