How to distinguish System.Windows.Controls.SelectedItemCollection?

Question

I have a method:

private void DeletePuzzle(object param) { } 

param is System.Windows.Controls.SelectedItemCollection , which I got from the WPF ListView SelectedItems property.

Somehow I cannot distinguish it from an object for anything useful. I cannot create a System.Windows.Controls.SelectedItemCollection due to its level of protection, and param will not be dropped on IList , ICollection or IEnumerable .

How can I iterate over parameter items?

Answer 1

That's right, figured it out. I kept trying to use it as

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

What told me that it cannot convert from SelectedItemCollection to IList ...

This is actually what you need to do.

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

Answer 2

from reflector: -

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

The selected ListView items are IList, id, to see the calling method.

Answer 3

Check type: System.Collections.Generic.IList<(Of <(ListViewDataItem>)>)