Question

If I have 2 classes and want to take 2 properties from each class, and combine them into a separate collection, how would this be done using linq?

Say the 2 classes are:

class guitars
    public ID
    public title
    public manufacturer
end class

class drums
    public ID
    public title
    public manufacturer
end class

I tried this, but it didn’t work:

   Private Interface Instruments
       Property ID As String
       Property name As String
   End Interface

   Dim results = From item In guitars _
        Select New Instruments() With _
                         { _
                             .ID = item.ID, _
                             .name = item.Title _
                         }

   Dim results2 = From item In drums _
        Select New Instruments() With _
                          { _
                              .ID = item.ID, _
                              .name = item.Title _
                          }

Dim combined = results + results2

Answer 1

You can make it much simpler than that.

Just make both classes implement the IInstrument interface.
You can then write

guitars.Cast(Of IInstrument)().Concat(drums)