Question

i have a Problem with UNION for LINQ to SQL

I have my LINQ query

Dim dc As New ContainerDB.DataClassesDataContext()
    Dim test = (From container In dc.GetTable(Of tbl_container)() Where container.pkContainerID = iPkContainerID).Union( _
                    From containerHist In dc.GetTable(Of tbl_containerHIST)() Where containerHist.pkContainerID = iPkContainerID)

I always get implicit conversion error

System.Linq.IQueryable(Of
ContainerDB.tbl_containerHIST) in
System.Collections.Generic.IEnumerable(Of
ContainerDB.tbl_container).

Whats wrong on that query?
What am i missing?

Thanks in advance

Answer 1

Try to put Option Infer On. This will enable the use of type inference, which you seem to be doing here:

Dim test =

EDIT

Also, you need to use anonymous types:, so tbl_container and tbl_containerHIST can be compared:

Dim test = (From container In dc.GetTable(Of tbl_container)() 
            Where container.pkContainerID = iPkContainerID 
            Select New With{ ... }).Union( _
            From containerHist In dc.GetTable(Of tbl_containerHIST)() 
            Where containerHist.pkContainerID = iPkContainerID 
            Select New With{ ... })