How to cast a System.Windows.Controls.SelectedItemCollection?

Question

I have a method:

private void DeletePuzzle(object param) 
{
}

param is a System.Windows.Controls.SelectedItemCollection, that I got from a WPF ListView's SelectedItems property.

Somehow, I can't seem to cast it from an object to anything useful. I can't create a System.Windows.Controls.SelectedItemCollection because of its protection level, and param won't cast to IList, ICollection or IEnumerable.

How can I iterate through param's items?

Solution 1

Right, got it sorted. I kept trying to cast it like

IList<PuzzleViewModel> collection = (IList<PuzzleViewModel>)param;

Which told me it couldn't convert from SelectedItemCollection to IList...

This is in fact what you need to do.

System.Collections.IList items = (System.Collections.IList)param;
var collection = items.Cast<PuzzleViewModel>();

Solution 2

from reflector : -

[Category("Appearance"), Bindable(true), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
public IList SelectedItems
{
    get
    {
        return base.SelectedItemsImpl;
    }
}

Selected Items of ListView is an IList, id like to see the calling method.

Comments

[user6170001]

I think that's a Web Forms thing, not WPF.

[Matt Searles]

The calling method was from a RelayCommand (Josh Smiths version). The SelectedItemCollection was getting through ok, but one has to cast it to an IList, not an IList<T>, and then cast that.

[Hodaya Shalom]

Thank you, it helped me a lot

[Peter Duniho]

That's not even legal C# code never mind does the answer provide any useful insight at all.

[David Bentley]

You can also under certain situations, convert directly to what you need. If you want a List or an Array you can just do var collection = items.Cast<PuzzleViewModel>().ToArray() or var collection = items.Cast<PuzzleViewModel>().ToList()