Get the TextBlock in a ListView in Windows 8.1 - windows-phone

Question

I am using Windows 8.1. I have a ListView which populates using ItemsSource property.
And in my ListView.ItemTempalte, it has a TextBox.
<ListView
ItemsSource="{Binding CollectionGroups, Source={StaticResource GroupedData}}">
<ListView.ItemTemplate>
<DataTemplate>
<TextBox Text="{Binding Group.Property1}"
Foreground="Black" FontSize="18" />
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
My question is how can I get the last item text box in my C# code? The code behind for the xaml page that I show above? For example, I have 10 items in my CollectionGroups, my list view should have 10 text box. How can I get the 10th Text box of the list view?
Thank you.

Answer 1

First off, you need to assign names to your markup:
<ListView
ItemsSource="{Binding CollectionGroups, Source={StaticResource GroupedData}}" x:Name="lvGroupData">
<ListView.ItemTemplate>
<DataTemplate>
<TextBox Text="{Binding Group.Property1}"
Foreground="Black" FontSize="18" x:Name="tbProperty1" />
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
Then you need a VisualTreeHelper method (this is the standard way, you will find methods that are more or less like this one all over the web):
public T FindElementByName<T>(DependencyObject element, string sChildName) where T : FrameworkElement
{
T childElement = null;
var nChildCount = VisualTreeHelper.GetChildrenCount(element);
for (int i = 0; i < nChildCount; i++)
{
FrameworkElement child = VisualTreeHelper.GetChild(element, i) as FrameworkElement;
if (child == null)
continue;
if (child is T && child.Name.Equals(sChildName))
{
childElement = (T)child;
break;
}
childElement = FindElementByName<T>(child, sChildName);
if (childElement != null)
break;
}
return childElement;
}
Now you can access the element you need:
this.UpdateLayout();
// Get the last item here
var lvItem = this.lvGroupData.Items[this.lvGroupData.Items.Count - 1];
var container = this.lvGroupData.ContainerFromItem(lvItem);
// NPE safety, deny first
if (container == null)
return;
var textboxProperty1 = FindElementByName<TextBox>(container, "tbProperty1");
// And again deny if we got null
if (textboxProperty1 == null)
return;
/*
Start doing your stuff here.
*/