Question

I have the following code to select all counties given a stateid from a counties table.

 Public Shared Function GetCountiesfromState(statename As String) As List(Of String)
    Dim context As New Model.teckEntities()
    Dim query = From c In context.counties Where c.stateId = 7 Select c
    Return query.ToList()
End Function

I get any error that query is returning a list of model. any thoughts on where the error lies?

Answer 1

If there is a Name (or Title) field on the County entity, it should be as simple as:

Public Shared Function GetCountiesfromState(statename As String) As List(Of String)
    Dim context As New Model.teckEntities()
    ' Here is the difference:
    Dim query = From c In context.counties Where c.stateId = 7 Select c.Name
    Return query.ToList()
End Function

In your code above you were selecting the c which, is a County entity, not necessarily a string property. By selecting c.Name (or c.Title) instead, you’ll be building a list of strings instead of a list of county entities.

Cheers.