Question

I have a ListView contains 100 items, and we can do certain activities based on selected items. I have used EnsureVisible() method to adjust the visibility and my ListView refreshing time to time to update the data.

The problem now i am facing is if I select the first item in the list, I then start paging down (maybe select the 21th, 59th
and 75th) during this select, I could have highlighted the 1st, 24th and
56th when the control suddenly refreshes the page in this instance, only the 1st selected retains the focus and I have lost my other selections and have to go through again either individually or just quicker.

So my question is how i can select multiple items and do the action while ListView is refreshing during certain interval to fill data though EnsureVisible() is used?

This is my exisitng code:

 if (_listviewFirst.SelectedItems.Count > 0)
        {
            _listviewFirst.SelectedItems[_listviewFirst.SelectedItems.Count - 1].EnsureVisible();
            _listviewFirst.SelectedItems[0].EnsureVisible();
        }

Answer 1

I would use the ListView.ItemSelectionChanged (MSDN) event and add/remove items (or their references) from a List of selected items. When your control is refreshed you should then iterate your selected items and update the items to selected in your ListView.

You will be able to take advantage of e.IsSelected and e.Item or e.ItemIndex in the event handler to do this.

I wouldn’t use EnsureVisible at all for this.