Question

我在使用来自两个不同edmx文件的两个表查询LINQ时遇到此错误。查询运行为，简单地说，我想要部门和名称与id匹配，名称与用户在 usermaster 表中具有该部门和名称，以及 Routemaster 在哪里 uid =具有会话值的本地变量

  var qryRoute = (from rm in db.RouteMasters
                        from um in db.UserMasters
                        from dm in db.DeptMasters
                        from desgm in db2.DESG_MASTER
                        where um.UserID == uid 
                        && rm.UnitID == um.UnitID 
                        && rm.ForDept == um.DeptID 
                        && rm.ReqDept == dm.DeptID 
                        && rm.ReqDesg == desgm.ID 
                        && rm.RouteType == "General" 
                        && rm.IsActive == 1
                        select new
                        {
                            rm.RouteID,
                            rm.UnitID,
                            rm.ForDept,
                            rm.RouteType,
                            rm.ReqDept,
                            rm.ReqDesg,
                            dm.Department,
                            desgm.DESG_ID,
                            rm.Seq,
                            rm.IsActive

                        });

        RouteMaster RM;
        foreach (var i in qryRoute)
        {
            RM = new RouteMaster();
            RM.RouteID = i.RouteID;
            RM.UnitID = i.UnitID;
            RM.ForDept = i.ForDept;
            RM.RouteType = i.RouteType;
            RM.ReqDept = i.ReqDept;
            RM.ReqDesg = i.ReqDesg;
            RM.ReqDeptName = i.Department;
            RM.ReqDesgName = i.DESG_ID;
            RM.Seq = i.Seq;
            RM.IsActive = i.IsActive;
            obj.RouteList.Add(RM);
        }

db和db2是两个不同edmx文件的实例。

显示错误：指定的LINQ表达式包含对与不同上下文关联的查询的引用。

有什么想法可以解决这个问题吗？

Answer 1

我找到了答案通过启用

MultipleActiveResultSets=True

在connectionstring中，我已将查询更改为以下内容，

        var qryRoute = (from rm in db.RouteMasters
                        from um in db.UserMasters
                        where um.UserID == uid
                        && rm.UnitID == um.UnitID
                        && rm.ForDept == um.DeptID
                        && rm.RouteType == "General"
                        && rm.IsActive == 1
                        select new
                        {
                            rm.RouteID,
                            rm.UnitID,
                            rm.ForDept,
                            rm.RouteType,
                            rm.ReqDept,
                            rm.ReqDesg,
                            rm.Seq,
                            rm.IsActive
                        });
        obj.RouteList = new List<RouteMaster>();
        foreach (var i in qryRoute)
        {
            obj.RouteList.Add(new RouteMaster
           {
               RouteID = i.RouteID,
               UnitID = i.UnitID,
               ForDept = i.ForDept,
               RouteType = i.RouteType,
               ReqDept = i.ReqDept,
               ReqDesg = i.ReqDesg,
               ReqDeptName = db.DeptMasters.FirstOrDefault(x => x.DeptID == i.ReqDept).Department,
               ReqDesgName = db2.DESG_MASTER.FirstOrDefault(x => x.ID == i.ReqDesg).DESG_ID,
               Seq = i.Seq,
               IsActive = i.IsActive
           });
        }

复杂的LINQ查询参考错误

1 个答案: