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?
答案 0 :(得分: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
});
}