Filtering Null values in Select

Question

I have IQueryable list of objects of type T which I want to transform into objects of type K

List<K> tranformedList = originalList.Select(x => transform(x)).ToList();

the transform function returns null if it cannot tranform the objects.If I want to filter out null elements can I call

List<K> tranformedList = originalList.Select(x => transform(x))
                                     .Where(y => y != default(K))
                                     .ToList();

or is there any other way of filtering out null elements when calling Select in LINQ ?

Answer 1

Can't you just do something like this:

List<K> tranformedList = originalList.Select(x => tranform(x))
                                 .Where(y => y != null) //Check for nulls
                                 .ToList();

Answer 2

What about

    List<K> tranformedList = originalList
                             .Select(transform)
                             .OfType<K>()
                             .ToList()

Takes care of unboxing an getting rid of nulls at the same time (especially when K is a struct)

David B I dont believe you that your code .Where(y => y != null) works when K is an int! There is NO WAY you will get that code to compile if K is an int!