Question

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

堆栈追踪：

at Hydra.WPF.ViewModels.AddressListViewModel._primaryMemberListWorker_DoWork（Object 发件人，DoWorkEventArgs e）in M：\项目\水润\ WPF \的ViewModels \ AddressList中\ AddressListViewModel.cs：行 1377年 System.ComponentModel.BackgroundWorker.WorkerThreadStart（对象参数）

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

Linq：

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，它听起来像是可能的罪魁祸首。如果在查询之前执行var criteriaId = criteria.AddressList.Id;会发生什么情况，并为查询而不是条件提供criteriaId.AddressList.Id？

带有linq查询和groupBy的NotSupportedException

1 个答案: