Programmatically set listbox selected items from comma separated list

Question

I'm having issues with setting selected items in a listbox from a comma separated data list.

The comma delimited list has values like this (valueList): A,B,C,D

List<string> values = valueList.Split(',').ToList();

foreach(string val in values)
{
    listBox.SelectedItems.Add(val);
}

Basically I loop through the items in the delimited list and attempt to set the selected items in the listbox (which contains the items A, B, C, D, E, F). With this code, I suspected it would select items A-D in the list box, but it doesn't highlight/select any items.

Any ideas?

Answer 1

Since you have already have items in your ListBox and on you want to select only those returned by the string.Split operation then use ListBox.SetSelected method like:

var valueArray = valueList.Split(',');
for (int i = 0; i < listBox.Items.Count; i++)
{
    if (valueArray.Contains(listBox.Items[i].ToString()))
    {
        listBox.SetSelected(i, true);
    }
}