C# LINQ to Entities无法识别方法“System.String get_Item（Int32）”方法，并且无法将此方法转换为存储表达式

执行此查询时，会出现以下错误：

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无法识别方法'System.String get_ItemInt32'方法，并且无法将此方法转换为存储表达式

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我知道问题是因为查询，查询应该在select语句之前执行，所以我的问题是如何在select语句之前执行此查询？

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{...}));

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执行查询，然后从结果中选择object

var result = (from i in _ctx.TestPackages
   where i.Id==TestPackageId).ToList();

return(result.Select( new ViewTestPackageState{...}));

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