c# - NotSupportedException 与 linq 查询和 groupBy

Question

我在运行此 Linq 查询时收到“NotSupportedException”。 “不支持指定的方法。”什么方法？即使注释掉“Count()”，错误也是一样的。空内部异常。

堆栈跟踪:

at Hydra.WPF.ViewModels.AddressListViewModel._primaryMemberListWorker_DoWork(Object sender, DoWorkEventArgs e) in M:\Projects\Hydra\WPF\ViewModels\AddressList\AddressListViewModel.cs:line 1377 at System.ComponentModel.BackgroundWorker.WorkerThreadStart(Object argument)

SQL 查询:

Select * From _Members
Inner Join AddressDetailsCCN a on a.MemberId=_Members.MemberID
Inner Join 
  (
  Select Address+Address2 as CombinedAddress 
  From AddressDetailsCCN Where ListId=84 
  group by Address+Address2
  Having COUNT(*)>1
  ) B on B.CombinedAddress=A.Address+A.Address2
Where CombinedAddress is not null AND CombinedAddress!='' AND a.ListId=84
Order by ClientID, CombinedAddress

林克:

var grouped = 
   (from mem in session.Query<Member>()
    join detail in session.Query<Detail>() on mem.Id equals detail.Member.Id
    join d2 in (from d3 in session.Query<Detail>()
                where d3.AddressList.Id == criteria.AddressList.Id
                group d3 by d3.Address + d3.Address2 into x
                where x.Count() > 1
                select x) on detail.Address+detail.Address2 equals d2.Key
    where detail.AddressList.Id==criteria.AddressList.Id
    select mem);

Answer 1

您如何生成标准变量？如果这本身就是一个延迟查询或其他东西，那么它听起来很可能是罪魁祸首。如果您在查询之前执行 var criteriaId = criteria.AddressList.Id; 并向查询提供 criteriaId 而不是 criteria.AddressList.Id，会发生什么？