Question

I have a listbox containing checkboxes. I want to get all the checkbox checked items content in a string array. How can I get this?

<Grid x:Name="ContentPanel" Grid.Row="1" Margin="12,0,12,0"> 
    <ListBox x:Name="TrackingView1" Margin="9,0,2,5"> 
        <ListBox.ItemTemplate> 
            <DataTemplate> 
                <CheckBox x:Name="fileNameLinkButton" Content="{Binding BindsDirectlyToSource=True}" FontFamily="Segoe WP Semibold" Foreground="Black" FontSize="20" /> 
            </DataTemplate> 
        </ListBox.ItemTemplate> 
    </ListBox> 
</Grid>

Answer 1

You can use VisualTreeHelper to retrieve the datatemplate items,
use this method to get the first item of datatemplate

 //method for finding first element of the listbox data template
    private T FindFirstElementInVisualTree<T>(DependencyObject parentElement) where T : DependencyObject
    {
        var count = VisualTreeHelper.GetChildrenCount(parentElement);
        if (count == 0)
            return null;
        for (int i = 0; i < count; i++)
        {
            var child = VisualTreeHelper.GetChild(parentElement, i);
            if (child != null && child is T)
            { return (T)child; }
            else
            {
                var result = FindFirstElementInVisualTree<T>(child);
                if (result != null)
                    return result;
            }
        }
        return null;
    }

then use this code in the event you want to, for example on a button click

 int itemsCount = this.TrackingView1.Items.Count;
 List<string> myList = new  List<string>();
 for (int i = 0; i < itemsCount; i++)
 {
            ListBoxItem item = (ListBoxItem)this.TrackingView1.ItemContainerGenerator.ContainerFromIndex(i);
            CheckBox tagregCheckBox = FindFirstElementInVisualTree<CheckBox>(item);
            if((bool)tagregCheckBox.IsChecked)                
              myList.Add(tagregCheckBox.Content.ToString());
 }