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Windows Presentation Foundation Discussion of the beta version of Windows Presentation Foundation "WPF" formerly know as codename "Avalon" as well as the related XAML.
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Old April 22nd, 2007, 05:48 PM
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Default CheckBox binding in ListView - Multiple events!

I'm binding a checkbox in a ListView to a boolean column in a DataTable, and catching the Checked & Unchekced events to add & remove rows from the table (this is to create a multi-select, multi-column TreeListView, because the WPF TreeView is so basic).

Here's the strange behavior:

When I handle the Checked event and insert rows, all is well. But after I remove the rows in the Unchecked handler, the next time I click on any CheckBox, I get multiple Checked events, one for each time I handled the Unchecked event! The events are not nested so I can't use a flag to block them.

Any ideas? Here's a code snippet for the Unchecked event handler:

// Remove child rows (rows after current row with Level greater than current row)
private void OnUnChecked(object sender, RoutedEventArgs e)
{
    e.Handled = true;
    DataRow row = ((DataRowView)((CheckBox)sender).DataContext).Row;

    List<DataRow> rowsToRemove = new List<DataRow>();
    for (int i = table.Rows.IndexOf(row) + 1; i < table.Rows.Count; i++)
    {
        if ((int)table.Rows[i]["Level"] <= (int)row["Level"])
        {
            break;
        }

        rowsToRemove.Add(table.Rows[i]);
    }

    foreach (DataRow rowToRemove in rowsToRemove)
    {
        table.Rows.Remove(rowToRemove);
    }
}


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Old April 22nd, 2007, 06:39 PM
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Default

As a workaround, if I handle the Click event for the CheckBox instead of the Checked & Unchecked events, I don't have this problem.



This would appear to be a bug in the ListView - perhaps it is reusing ListViewItems and forgetting to remove Checked event handlers? I forgot to mention that I tried rebinding to the table after removing rows in order to start fresh, but I still got multiple Checked events.


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