Question

Say “Foo” is a Linq to SQL entity created in the Linq to SQL designer.

I then have “Bar” which derives from “Foo”.

Should I be able to save “Bar” using Linq to SQL (assuming I don’t care abut saving any of the extra properties on Bar).

        using (myDataContext ctx = new myDataContext())
        {
            ctx.Foos.InsertOnSubmit(instanceOfBar);
            ctx.SubmitChanges();
        }

Is this supposed to be supported?

Thanks much,
Jon

Answer 1

I’ve tried to do this once upon a time and couldn’t get it to work. Can’t remember what the error that was thrown, but to get around it, i basically had to go through all the properties using reflection and copy the properties marked with ColumnAttribute into a new base class instance and then insert that instead. It’s not pretty, but it works. I haven’t reinvestigated the issue since i implemented it, so if there’s a better way, i’d love to know.