C# ListView - control checkBox event

Question

Suppose I need to change the status of an item from active = true to active = false and vise versa and at the same time persist my change in the database table.

I tested ItemChecked event like the following:

    private void listView1_ItemChecked(object sender, ItemCheckedEventArgs e)
    {
        ListViewItem item = (ListViewItem)sender;

        if (item != null)
        {
            Book b = (Book) item.Tag;

            b.MakeActive(item.Checked);
        }
    }

I failed.

Can anyone help me?

ListViewItem item = (ListViewItem)sender; will throw an exception if its an invalid cast so you will need to change that line to ListViewItem item = sender as ListViewItem; if you want an invalid cast to return null — Charlie
– Charlie, Commented Jun 10, 2009 at 16:07
Please describe how you fail. Do you get an exception - what do you expect to happen, what happens? — tanascius
– tanascius, Commented Jun 10, 2009 at 16:17
private void listView1_ItemChecked(object sender, ItemCheckedEventArgs e) { ListViewItem item = (ListViewItem)e.Item; if (item != null) { if (item.Tag != null) { Teacher t = ((Teacher)item.Tag); t.TeacherGoesToLeave(item.Checked); } } } I became successful this way. — JMSA
– JMSA, Commented Jun 10, 2009 at 16:29

Stan R. · Accepted Answer · 2009-06-10 17:29:24Z

4

in this case object sender is ListView and not ListViewItem your code should be this

private void listView1_ItemChecked(object sender, ItemCheckedEventArgs e)
{
   ListViewItem item = e.Item as ListViewItem;

    if (item != null)
    {
        Book b = (Book) item.Tag;

        b.MakeActive(item.Checked);
    }
}

answered Jun 10, 2009 at 17:29

Stan R.

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