How to use Virtual mode in ListView?

Question

i'm using VirtualMode to fill the columns like

List<ListViewItem> m_lstItem;


    private void Form1_Load(object sender, EventArgs e)
    {
        m_lstItem = Enumerable.Range(0, 100000).Select(X => new ListViewItem(new String[] { X.ToString(), (X + 1).ToString() })).ToList();
        listView1.VirtualListSize = m_lstItem.Count;
    }

    private void listView1_RetrieveVirtualItem(object sender, RetrieveVirtualItemEventArgs e)
    {
        e.Item = m_lstItem[e.ItemIndex];
    }

but i can not access the selected item. while accessing the selected item its throwing an error like Cannot access the selected items collection when the ListView is in virtual mode.

How do i get the selected items from the listView when it is in VirtualMode

Please help me to do this.

score 10 · Accepted Answer · answered Mar 24 '11 at 07:17

10

From MSDN:

In virtual mode, the Items collection is disabled. Attempting to access it results in an InvalidOperationException. The same is true of the CheckedItems collection and the SelectedItems collection. If you want to retrieve the selected or checked items, use the SelectedIndices and CheckedIndices collections instead.

answered Mar 24 '11 at 07:17

26071986

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Adding link to MSDN for reference https://learn.microsoft.com/en-us/dotnet/api/system.windows.forms.listview.virtualmode – Tatranskymedved May 22 '23 at 09:07

score 2 · Answer 2 · edited May 23 '17 at 11:48

2

The Items collection is not available as an iterable collection in Virtual Mode but it is always possible to access a single element using Items(SelectedIndices(0)). I found that it works also using FULLROWSELECT. The problem is referenced on another page of this same site: Cannot access the selected items collection when the ListView is in virtual mode?

edited May 23 '17 at 11:48

Community

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answered Nov 13 '12 at 16:27

Iacopo Vettori

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score 0 · Answer 3 · edited Oct 28 '12 at 00:26

0

For some reason the SelectedIndices were always invalid when I tried to use them, maybe because of using FULLROWSELECT.

The selected item was available however even if the documentation wasn't clear. I found it with the ItemSelectionChanged event handler as e.ItemIndex.

Hope this might be helpful to someone else.

edited Oct 28 '12 at 00:26

Toon Krijthe

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answered Mar 01 '12 at 05:14

ToniMarieM

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How to use Virtual mode in ListView?

3 Answers3

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