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?

What error do you get when you try to cast `param` to `IEnumerable`? Also, have you tried casting it to `IEnumerable — Adam Maras, Dec 10 '09 at 00:50

score 142 · Accepted Answer · edited Mar 14 '15 at 08:03

142

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>();

edited Mar 14 '15 at 08:03

Rowland Shaw

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answered Dec 10 '09 at 03:24

Matt Searles

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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().ToArray()` or `var collection = items.Cast().ToList()` – David Bentley Dec 02 '17 at 18:30

score 1 · Answer 2 · answered Dec 10 '09 at 00:51

1

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.

answered Dec 10 '09 at 00:51

Aran Mulholland

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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, and then cast that. – Matt Searles Dec 10 '09 at 03:30

score -6 · Answer 3 · edited Mar 14 '15 at 07:34

-6

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

edited Mar 14 '15 at 07:34

Alex Deen

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answered Dec 10 '09 at 00:46

pipelinecache

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I think that's a Web Forms thing, not WPF. – itowlson Dec 10 '09 at 00:54
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That's not even legal C# code never mind does the answer provide any useful insight at all. – Peter Duniho Mar 15 '15 at 03:57

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

3 Answers3

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