Unable to cast object of type 'System.Collections.Generic.List`1 [<>f__AnonymousType6`65[System.String,System.Decimal,System.Nullable`1 - linq-to-sql

Question

I'm trying to hit my head to get out of this issue in which I'm not able to convert System.Collections.Generic.List to IEnumerable, below is my code :
IEnumerable<PY_History_TransactionTAB> FilteredReport;
var ReportData = db.PY_History_TransactionTAB
.Where(x => x.SystemCode == SysCode)
.GroupBy(x => x.EmployeeCode);
FilteredReport = (IEnumerable<PY_History_TransactionTAB>)ReportData.Select(x => new
{
EmployeeCode = x.Key,
H_SalaryDays = x.Sum(y => y.H_SalaryDays ?? 0),
H_NET_Overtime = x.Sum(y => y.H_NET_Overtime),
H_Overtime_Amount = x.Sum(y => y.H_Overtime_Amount),
H_SL_Breakup1 = x.Sum(y => y.H_SL_Breakup1 ?? 0),
H_SL_Breakup2 = x.Sum(y => y.H_SL_Breakup2 ?? 0),
H_SL_Breakup3 = x.Sum(y => y.H_SL_Breakup3 ?? 0),
H_OT_Allowance1 = x.Sum(y => y.H_OT_Allowance1 ?? 0),
H_OT_Allowance2 = x.Sum(y => y.H_OT_Allowance2 ?? 0),
H_OT_Allowance3 = x.Sum(y => y.H_OT_Allowance3 ?? 0),
H_OT_Allowance4 = x.Sum(y => y.H_OT_Allowance4 ?? 0),
H_OT_Allowance5 = x.Sum(y => y.H_OT_Allowance5 ?? 0)
}).ToList();
When I run the application, it throws a runtime exception System.InvalidCastException at point of assignment to FilteredReport variable, by saying :
{"Unable to cast object of type 'System.Collections.Generic.List1[<>f__AnonymousType665
[System.String,System.Decimal,System.Nullable1[System.Decimal],System.Nullable1[System.Decimal],
System.Decimal,System.Decimal,System.Decimal,System.Decimal,System.Decimal,System.Decimal,System.Decimal,
System.Decimal,System.Decimal,System.Decimal,System.Decimal,System.Decimal,System.Decimal,System.Decimal
,System.Decimal,System.Decimal,System.Decimal,System.Decimal,System.Decimal,System.Decimal,System.Decimal,
System.Decimal,System.Decimal,System.Decimal,System.Decimal,System.Decimal,System.Decimal,System.Decimal,
System.Decimal,System.Decimal,System.Decimal,System.Decimal,System.Decimal,System.Decimal,System.Decimal,
System.Decimal,System.Decimal,System.Decimal,System.Decimal,System.Decimal,System.Decimal,System.Decimal,
System.Decimal,System.Decimal,System.Decimal,System.Decimal,System.Decimal,System.Decimal,System.Decimal,
System.Decimal,System.Decimal,System.Decimal,System.Decimal,System.Decimal,System.Decimal,System.Decimal,
System.Decimal,System.Decimal,System.Decimal,System.Decimal,System.Decimal]]' to type 'System.Collections
.Generic.IEnumerable`1[HrAndPayrollSystem.Models.PY_History_TransactionTAB]'."}
So, what I get is that I'm not going right, I need to find a right way, What should I do to get rid of this issue or what is the right way to convert a List to IEnumerable? Any Help will be deeply appreciated, Thanks in Advance!
Update:
Ok, René Vogt's answer is correct for the above issue, but then I encounter an another Exception System.NotSupportedException at the same point saying :
The entity or complex type
'HrAndPayrollSystem.Models.PY_History_TransactionTAB'
cannot be constructed in a LINQ to Entities query.
How should I resolve it?

Answer 1

The reason is that you return an List of an anonymous type. So this List<anonymousType> is a totally different type than a IEnumerable<HrAndPayrollSystem.Models.PY_History_TransactionTAB>.
So you need to change your Select call to something like:
FilteredReport = (IEnumerable<PY_History_TransactionTAB>)ReportData.Select(x =>
new PY_History_TransactionTAB // specify type!!
{
EmployeeCode = x.Key,
// shortened for brevity... set properties appropriatly
}).ToList();
Now the returned list is of type List<PY_History_TransactionTAB> which implements IEnumerable<PY_History_TransactionTAB>.