C# – Selecting items in a listbox using C#

clistboxselectionwpf

I am using two ListBox controls in my WPF window that are identical (identical = ItemSource of both the ListBox is same and so they look same) and the selection mode on both the ListBoxes is set to Multiple.

Lets call the ListBoxes LB1 and LB2 for the time being, now when I click an item in LB1, I want the same item in LB2 to get selected automatically i.e if I select 3 items in LB1 using either Shift+Click or Ctrl+Click the same items in LB2 get selected.

Have dug the Listbox properties like SelectedItems, SelectedIndex etc but no luck.

Best Answer

Place a SelectionChanged event on your first listbox

LB1.SelectionChanged += LB1_SelectionChanged;

Then implement the SelectionChanged method like so:

void LB1_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
    LB2.SelectedItems.Clear();
    foreach(var selected in LB1.SelectedItems)
    {
        LB2.SelectedItems.Add(selected);
    }
}

Related Solutions

How to transfer multiselect listbox items(any orde selected items) to another listbox in .vb

public static class Extensions
{
    public static IEnumerable<ListItem> GetSelectedItems(
           this ListItemCollection items)
    {
        return items.OfType<ListItem>().Where(item => item.Selected);
    }


}
On button click
------------------
var selected = lstFirst.Items.GetSelectedItems();

    foreach (var li in selected)
    {
        if (!lstSecond.Items.Contains(li))
        {
            ListItem newItem = new ListItem(li.Text, li.Value);
            lstSecond.Items.Add(newItem);
        }
    }

R – Listbox ClearSelected method leaves items selected

I ran a quick example with 2 listboxes and got this method to work:

Private Sub ListBox1_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) _
        Handles ListBox1.Click, ListBox2.Click
    Dim lbx As ListBox = CType(sender, ListBox)
    Dim i As Integer = lbx.SelectedIndex
    ListBox1.ClearSelected()
    ListBox2.ClearSelected()

    lbx.SelectedIndex = i

End Sub

Just loop through all your list boxes, calling the ClearSelected method, then re-select the one that triggered the event. Don't run this code in the .SelectedIndex event, that will get you into an infinite loop that will quickly cause a crash.

Best Answer

Related Solutions

How to transfer multiselect listbox items(any orde selected items) to another listbox in .vb

R – Listbox ClearSelected method leaves items selected

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