我想创建一个包含几个子查询的linq查询。我创建了查询似乎是正确的(至少在语法),但我送回到没有数据和提琴手正显示出与此查询错误:C#LInq子查询问题
public IQueryable<vGatekeeperApproval> GetGatekeeperApprovals(string UserName)
{
SystemsFormsDataContext db = new SystemsFormsDataContext();
IQueryable<vGatekeeperApproval> query;
Int32 UserId = GetCurrentUserId(UserName);
bool IsGatekeeperApprover = IsCurrentUserGKApprover(UserName);
string strSysApproverEmail = GetSystemsApproverEmail(UserName);
try
{
query = (from s in db.vGatekeeperApprovals
join r in db.Requests on s.RequestId equals r.Id
where (IsGatekeeperApprover == true || s.OverrideApproverId == UserId)
&& (
(
from u in db.Staffs
where u.GateKeeperArea ==
(from c in db.vGK_DIV_USING_CCs
where c.SEGMENT_CODE ==
(from a in db.Attributes
where a.AttributeItemId== global_COSTCENTRE && a.FormId==s.Id
select a.AttributeValue).FirstOrDefault()
select c.PARENT_CODE_L3
).FirstOrDefault()
select u.Id
).ToList().Contains(UserId)
)
select s
);
}
catch (Exception ex)
{
query = (from s in db.vGatekeeperApprovals
where s.UserId == 0
select s);
//LogEvent("ERROR!" + ex.Message, ex.Source);
}
return query;
}
任何想法是什么原因造成的问题?有没有更好的方法来在linq中创建子查询?
任何帮助将不胜感激。
舒亚
你会得到什么错误? – SLaks