Linq to update a collection with values from another collection?

Question

I have IQueryable baseList

and List someData

What I want to do is update attributes in some

Answer 1

You can convert the IQueryable into a List, use the ForEach method to loop over it and update the elements, then convert back to IQueryable:

List convertedList = baseList.ToList();
convertedList.ForEach(sc =>
{
    SomeOtherClass oc = someData.First(obj => obj.SomeCode == sc.MyCode);
    if (oc != null)
    {
        sc.SomeData += oc.DataIWantToConcatenate;
    }
});

baseList = convertedList.AsQueryable(); // back to IQueryable

But it may be more efficient during this using non-LINQ constructs.