Getting the index of multiple selected items in a listbox using Silverlight

Question

I have a ListBox which is made up of Grid Items in Multiple SelectionMode in Silverlight 3.0.

When I use ListBox.SelectedIndex it only returns the first item which is selected.

I would like to be able see all of the selected items such that it would return all of the selected item indexes' such as; 2, 5, and 7, etc.

Any help?

Cheers,

Turtlepower.

Did you check whether there is a property named SelectedIndices/SelectedIndexList or similar ? — Jude Cooray
– Jude Cooray, Commented Oct 1, 2010 at 3:29
ListBox in Silverlight doesn't have SelectedIndices , but thank you anyway. — turtlepower
– turtlepower, Commented Oct 1, 2010 at 3:38

Yogesh · Accepted Answer · 2010-10-01 03:30:21Z

9

You can find the selected indexes by iterating through SelectedItems and finding the objects in the Items property, like this:

List<int> selectedItemIndexes = new List<int>();
foreach (object o in listBox.SelectedItems)
    selectedItemIndexes.Add(listBox.Items.IndexOf(o));

Or if you prefer linq:

List<int> selectedItemIndexes = (from object o in listBox.SelectedItems select listBox.Items.IndexOf(o)).ToList();

answered Oct 1, 2010 at 3:30

Yogesh

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6 Comments

turtlepower Over a year ago

Thank you Yogesh, it's nearly working. Strangely I have only 5 Items in my listbox and when I return them all I get 7 items which goes "0, 1, 2, 3, 4, 0, 0, 0". Why the extra three 0's on the end?

Yogesh Over a year ago

5 items as in selected items? Can you post the code you are using to "return them"?

turtlepower Over a year ago

List<int> selectedItemIndexes = new List<int>(); foreach (object o in myListBox.SelectedItems) { selectedItemIndexes.Add(myListBox.Items.IndexOf(o)); } Yes, 5 items and I only select 5 items too. Odd.

turtlepower Over a year ago

Ahh, as in when I am in the debugger and open up the List collection I see a trailing end of 0's after the selected items.

turtlepower Over a year ago

Update: doesn't seem to do it when I actually return the selectedItemsIndexes[i], must just be a trail off thing. Thanks for the help!

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