Member Avatar for Sravanthi Ch

Hi,

I need code to invert the selected items in list view.

Can any one help me out..

Thanks in advance for help..


Regards,

Sravanthi Ch

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Generated

Quick summary and clarification: the goal is to flip selection so every currently selected item becomes unselected and every currently unselected item becomes selected. pointed to the simple per-item toggle and showed a safe index-based approach; both work, but which one to use depends on whether you are using WinForms or WPF, whether the control is virtualized, and whether you need to suppress selection-change events while updating.

WinForms notes (System.Windows.Forms.ListView)

  • Make sure MultiSelect is true.
  • For performance and flicker reduction wrap large updates with BeginUpdate() / EndUpdate().
  • If you have a SelectedIndexChanged handler, temporarily unsubscribe it while changing selection to avoid reentrancy.
  • Prefer applying selection changes in bulk (build a list of indices to select, then apply) rather than mutating SelectedItems while iterating it. Use the SelectedIndices collection if you want to work by index.

WPF notes (System.Windows.Controls.ListView)

  • If you tried Items[i].Selected and that member is missing, you are likely in WPF: selection is on the container (ListViewItem.IsSelected) or via the view-model. Containers may be null when virtualization is on, so the robust pattern is to bind selection to your data model and toggle that property. Example patterns:
for (int i = 0; i < myWpfListView.Items.Count; i++)
{
    var container = myWpfListView.ItemContainerGenerator.ContainerFromIndex(i) as ListViewItem;
    if (container != null) container.IsSelected = !container.IsSelected;
    else /* toggle your item model's IsSelected property if you expose one */;
}

XAML pattern (bind container IsSelected to item property):

<ListView ItemsSource="{Binding Items}">
  <ListView.ItemContainerStyle>
    <Style TargetType="ListViewItem">
      <Setter Property="IsSelected" Value="{Binding IsSelected, Mode=TwoWay}" />
    </Style>
  </ListView.ItemContainerStyle>
</ListView>

Troubleshooting quick tips

  • If highlights are not visible, check HideSelection or focus state.
  • In virtual mode, toggle selection in your data, not in UI containers.
  • Use EnsureVisible (WinForms) or ScrollIntoView (WPF) if you need to reveal newly selected items.

These points tie back to the suggestions from and and answer ’s question about “how” to invert by showing which API and pattern is right depending on the framework and virtualization.

Recommended Answers

All 5 Replies

Member Avatar for Mitja Bonca

How to invert?
From last to 1st? By which column (items, or subItems)?

I need more information.

Edited by Mitja Bonca because: n/a
Member Avatar for Egop29

Hi, try this

private void button1_Click(object sender, EventArgs e)
        {
            for (int k = 0; k < listV.Items.Count; ++k)
            {
                listV.Items[k].Selected = !(listV.Items[k].Selected);
                
            }
            listV.Select();
        }
Member Avatar for Sravanthi Ch

Hi, try this

private void button1_Click(object sender, EventArgs e)
        {
            for (int k = 0; k < listV.Items.Count; ++k)
            {
                listV.Items[k].Selected = !(listV.Items[k].Selected);
                
            }
            listV.Select();
        }

Hi,

I am not gettign the selected property in listV.Items[k].Selected..

Any how i got the solution for it..

Thanks for replying.

Regards,

Sravanhi Ch

Member Avatar for Mitja Bonca

Would you mind telling me exactly what would you like to invert? I have no exact clue now, what you would you like to have. Thx in advance.

Member Avatar for Sravanthi Ch

Hi,

Here is the code i have used in my application.

Here i need to unselect the selected items and select the unselected item in a button click which means i need to invert the selected items in a list view.

// Storing the selected items in an int List

 List<int> _intList = new List<int>();
 for (int k = 0; k < MyListView.SelectedItems.Count; k++)
    _intList.Add(MyListView.Items.IndexOf(MyListView.SelectedItems[k]));

// Clearing the selected items

 MyListView.SelectedItems.Clear(); 

// Inverting
 for (int i = 0; i < MyListView.Items.Count; i++)
 {
 if (!_intList.Contains(i))
                    MyListView.SelectedItems.Add(MyListView.Items[i]);
}
Edited by Reverend Jim because: Fixed formatting
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