LINQ to Entities does not recognize the method System.ObjectCompareObjectEqual

Question

I had a code segment on an asp.net page in the code-behind file. I decided to move it into a public subroutine in a module (general_functions.vb). Once I did this, however, the code no longer works - it throws an error.

On the original code-behind I replaced the original code with a call like so:

DeleteResidency(people_id, semester, year)

Now in my general_functions.vb I created a public subroutine like follows:

Public Sub DeleteResidency(delpeople_id, delsemester, delyear)
    Using dbContext as pbu_housingEntities = New pbu_housingEntities
        Dim remove_selection = (From p in dbContext.Residents _
                               Where p.people_code_id = delpeople_id _
                               Where p.year = delyear _
                               Where p.semester = delsemester _
                               Order By p.id Descending _
                               Select p).FirstOrDefault
    End Using
End Sub

There is more code to it than that, but the code above is what throws the error. The error I get is:

LINQ to Entities does not recognize the method 'System.Object CompareObjectEqual(System.Object, System.Object, Boolean)' method, and this method cannot be translated into a store expression.

Can anyone help me understand why this is occurring?

Answer 1

Explicitly type your parameters in the definition of the DeleteResidency Sub Routine. This leaves less for the compiler to infer and prevents these types of errors.