我有很长的LINQ到实体查询: -LINQ到实体无法识别方法
reports = db.CallProfileDailies
.Join(db.ReportDailyTotals,
cpd => cpd.Date,
rdt => rdt.Date,
(cpd, rdt) => new { cpd = cpd, rdt = rdt })
.Where(a => a.cpd.Skill == a.rdt.Skill)
.Join(db.SummaryIntervalTotals,
a => a.rdt.Date,
sit => sit.Date,
(a, sit) => new { cpd = a.cpd, rdt = a.rdt, sit = sit })
.Where(a => a.rdt.Skill == a.sit.Skill)
.Select((a, i) => new ReportModel
{
AverageAbandonDelay = a.sit.AvgAbanTime,
AverageAfterCallWorkTime = a.sit.AvgAcwTime,
AverageHandleTime = (a.sit.AvgAcwTime + a.sit.AvgAcdTime),
AverageSpeedOfAnswer = a.sit.AvgSpeedAns,
AverageTalkTime = a.sit.AvgAcdTime,
CallsAnswered = a.sit.AcdCalls,
Date = a.sit.Date.ToString(),
MaximumDelay = a.sit.MaxDelay,
PercentageAbandon = (a.sit.AbanCalls/(a.sit.AcdCalls + a.sit.AbanCalls)),
TotalCallsAbandon = a.sit.AbanCalls,
TotalCallsOffered = (a.sit.AcdCalls + a.sit.AbanCalls),
TotalHandleTime = (a.rdt.HoldTime + a.rdt.AcdTime + a.rdt.AcwTime)
}).Take(5).ToList();
我在运行时收到以下错误: -
LINQ到实体不承认 该方法 “System.Linq.IQueryable`1 [ExpediaReports.Models.ReportModel] 选择[<> F_ AnonymousType1`3,ReportModel](System.Linq.IQueryable`1 [<>˚F _Ano [ExpediaReports.CallProfileDaily,ExpediaReports.ReportDailyTotal,ExpediaReports.SummaryIntervalTotal]], System.Linq.Expressions.Expression`1 [System.Func`3 [<> f__AnonymousType1`3 [ExpediaReports.CallProfileDaily,ExpediaReports.ReportDailyTotal,ExpediaReports .SummaryIntervalTotal],System.Int32,ExpediaReports.Models.ReportModel]])' 方法,并且此方法不能被 翻译成存储表达式。
我只是想了解这个错误是什么意思。我甚至无法阅读它(Linq To Entities)无法识别的方法。
如何阅读此错误并确定无法识别的方法,以便相应地更改我的查询?
什么这些字符这里的意思:'<>“等
哇,你有没有听说过你可以在多个表达式中表达同一个东西,并且它使得你的代码更易于阅读和调试:)是否有任何理由将所有记录映射到ReportModel,并且之后只需要5个他们,先拿5先不会更快? – Silx 2011-03-30 09:57:26