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  • Microsoft dynamic sdk中join应该注意的问题.

                                QueryExpression queryNextSeq = new QueryExpression { EntityName = "ep_prodoperationsequence" };
                                queryNextSeq.Criteria.AddCondition("ep_prodroutingno", ConditionOperator.Equal, ePOS.ep_ProdRoutingNo.Id);
                                queryNextSeq.Criteria.AddCondition("ep_sequenceno1", ConditionOperator.NotEqual, ePOS.ep_SequenceNo1);
                                queryNextSeq.ColumnSet.AddColumns("ep_prodoperationsequenceid", "ep_sequenceno1", "ep_operationsequence");
                                queryNextSeq.AddOrder("ep_sequenceno1", OrderType.Ascending);
    
                                queryNextSeq.LinkEntities.Add(new LinkEntity("ep_prodoperationsequence", "ep_operationsequence", "ep_opera                            tionsequence", "ep_operationsequenceid", JoinOperator.Inner));
                                queryNextSeq.LinkEntities[0].Columns.AddColumns("ep_operationsequenceid", "ep_dailywork");//被link实体ep_op                             erationsequence的列
                                queryNextSeq.LinkEntities[0].LinkCriteria.AddCondition("ep_dailywork", ConditionOperator.Equal, true);//给                                     被link实体添加条件
    
                                EntityCollection ecPrdSeq = service.RetrieveMultiple(queryNextSeq);
    
     foreach (ep_prodoperationsequence item in ecPrdSeq.Entities)
    {
      //取被join实体中的列,字典中必须是实体名称+1,还有就是列数据为null时,要先判断字典中是否包含该键值(就是该列),否则会抛出异常.explain by ldb
      if (item.Attributes.ContainsKey("ep_operationsequence1.ep_dailywork") && item["ep_operationsequence1.ep_dailywork"] != null)
       {
          bool daily  = Convert.ToBeanbool(((AliasedValue)item["ep_operationsequence1.ep_dailywork"]).Value);
    
       } 
    }
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  • 原文地址:https://www.cnblogs.com/longdb/p/7461533.html
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