How to get the index of the selectedItem in RadDataBoundListBox

[Marcus]

Hi,

since there is no selectedIndex in the RadDataBoundListBox, could you please provide an example to get the index to use with the wp NavigationService.

I know it is somehow possible with "indexOf" but a practical example would help here.

Thanks!

Best regards,
Marcus

[Todor]

Hi Marcus,

Thank you for your question.

Let's say you have a collection of items of type T called Items and this collection is the ItemsSource for a RadDataBoundListBox called listBox. Then here's how you can use IndexOf to get the index of the selected item:

int index = this.Items.IndexOf(this.listBox.SelectedItem as T);

Let me know if you need further assistance.

Greetings,
Todor
the Telerik team

[Marcus]

This one did the trick! Thanks!

[Daniel]

Is there another way to determine the selected index without a reference back to the assigned item collection?

[Kiril Stanoev]

Hi Daniel,

The other way would be to use RadDataBoundListBox's GetDataSourceItemForDataItem(object dataItem) method. The method returns an object of type IDataSourceItem which has an Index property. Give it a try and let me know how it goes.

Kind regards,
Kiril Stanoev
the Telerik team

[Delilah]

Not to include SelectedIndex... seriously.

[Deyan]

Hello Delilah,

We will extend the API of the control accordingly.

The lack of a SelectedIndex property is because of some performance considerations we have once when initially developing the concept of the control.

Greetings,
Deyan
the Telerik team

[FEDERICO]

Hi i can't o get the index of selected item when I use this:

List<db_autori> Lista_autori = context.db_autori.ToList();
radlist.ItemsSource = Lista_autori;

  private void radlist_ItemTap(object sender, ListBoxItemTapEventArgs e)
        {

            int index = this.Lista_autori.IndexOf(this.radlist.SelectedItem as db_autori);
            MessageBox.Show(index.ToString());

        }

it work well if I add item to collection manually

                    radlist.ItemsSource = Lista_autori;
                    db_autori federico = new db_autori();
Lista_autori.Add(federico);

how can i get the index of item for the first code??? :I tks

[Deyan]

Hello Federico,

Thanks for writing.



Based on the code you are sharing I cannot exactly say what happens. Can you please open a new support ticket and attach your project so that I can directly debug the code and be able to determine the reason for the undesired behavior.



Thanks for your time.



Regards,

Deyan
Telerik