How do I write a linq query against a ListCollectionView?

Question

none of these seem to do the trick:

var source = myViewModel.MyListCollectionView.Select(x => x as MyType);
var source = myViewModel.MyListCollectionView.Select<object, MyType>(x => x as MyType);
var source = myViewModel.MyListCollectionView.SourceCollection.Select<object, MyType>(x => x as MyType);

Odelle

Answer 1

ListCollectionView only implements the non-generic IEnumerable interface. I suspect you want:

var source = myViewModel.MyListCollectionView.Cast<MyType>();

or (if some values won't be of MyType, and that's okay):

var source = myViewModel.MyListCollectionView.OfType<MyType>();

Dragging

Minor note: OfType will also remove null items. – Sturrock

Answer 2

var source = myViewModel.MyListCollectionView.OfType<MyType>();

Retardant

Answer 3

The InternalList property is of type IList so you would be able to write a linq query against that.

Towpath

actually var source = myViewModel.MyListCollectionView.InternalList.Select(x=>x.MyProperty);doesn't work – Odelle

This is the non generic IList so you would still have to use Cast<>. Not to mention that this is a protected property and you couldn't access it unless you were extending ListCollectionView – Odelle

Answer 4

ahhhh found it. you have to use Cast<> first!

var source = myViewModel.MyListCollectionView.Cast<MyType>().Select(p=>p.MyProperty);

Odelle