当我执行这个查询时,我得到这个错误:
return (from i in _ctx.TestPackages
where i.Id==TestPackageId
select new ViewTestPackageState
{
Id = i.Id,
PackageNumber = i.PackageNumber,
ReInstatement = ReturnTestPackageState(i.Id, "Reinstatment")[0],
ReInstatementReportNumber = ReturnTestPackageState(i.Id, "Reinstatment")[1],
ReInstatementSubmitDateTime = ReturnTestPackageState(i.Id, "Reinstatment")[2],
TestReportNumber = ReturnTestPackageState(i.Id, "Test")[1],
TestState = ReturnTestPackageState(i.Id, "Test")[0],
TestSubmitDateTime = ReturnTestPackageState(i.Id, "Test")[2],
CleanReportNumber = ReturnTestPackageState(i.Id, "Clean")[1],
CleanSubmitDateTime = ReturnTestPackageState(i.Id, "Clean")[2],
CleaningState = ReturnTestPackageState(i.Id, "Clean")[0],
Drying = ReturnTestPackageState(i.Id, "Drying")[0],
DryingReportNumber = ReturnTestPackageState(i.Id, "Drying")[1],
DryingSubmitDateTime = ReturnTestPackageState(i.Id, "Drying")[2],
Flushing = ReturnTestPackageState(i.Id, "Flushing")[0],
FlushingReportNumber = ReturnTestPackageState(i.Id, "Flushing")[1],
FlushingSubmitDateTime = ReturnTestPackageState(i.Id, "Flushing")[2],
LineCheckReportNumber = ReturnTestPackageState(i.Id, "LineCheck")[1],
LineCheckState = ReturnTestPackageState(i.Id, "LineCheck")[0],
LineCheckSubmitDateTime = ReturnTestPackageState(i.Id, "LineCheck")[2],
Size = i.Size.ToString(),
TestPackageOrder = i.TestPackageOrder,
}).ToList();
错误:LINQ to Entities 无法识别 'System.String get_Item(Int32)' 方法,并且此方法无法转换为存储表达式
我知道问题出在查询上,查询应该在 select 语句之前执行,所以我的问题是如何在 select 之前执行这个查询?
最佳答案
执行查询,然后从结果中选择对象
var result = (from i in _ctx.TestPackages
where i.Id==TestPackageId).ToList();
return(result.Select( new ViewTestPackageState{...}));
关于c# - LINQ to Entities 无法识别方法 'System.String get_Item(Int32)' 方法,并且无法将此方法翻译成存储表达式,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/38921950/