CODEWITHSUNDEEP
c#windows-phone-8
Nishant Chandwani
Nishant Chandwani

Reputation: 175

event SelectionChanged of listbox How to get textblock text value wp8

I have a listbox, I have set a stackpanel and textblock in that. I want the last textblock's text because I have a set a value on last textbox text by using a converter.

The code posted below is tried by me and is not working 

 private void listname_SelectionChanged(object sender, SelectionChangedEventArgs e)
    {
        string textt = (((sender as ListBox) as StackPanel).Children[1] as TextBlock).Text; 

        //StackPanel sPanel = (sender as StackPanel) as StackPanel;
        //var tbxCollection = from tbx in sPanel.Children.OfType<TextBlock>()
        //                    where tbx.Name == "bl"
        //                    select tbx;

Upvotes: 2

Views: 597

Answers (2)

Romasz
Romasz

Reputation: 29792

If you want to search your ContentControl (ListBoxItem) for Controls, then you can use VisualTreeHelper class for this purpose.

The code below will help you to search for a specific Control(s) in DependencyObject - parent:

private static void SearchForControls<T>(DependencyObject parent, ref List<T> controlList) where T : DependencyObject
{
    int numberOfChildreen = VisualTreeHelper.GetChildrenCount(parent);
    for (int i = 0; i < numberOfChildreen; i++)
    {
       var child = VisualTreeHelper.GetChild(parent, i);
       if (child is T) controlList.Add((T)child);
       else SearchForControls<T>(child, ref controlList);
    }
}

With this pice of code you can manage to complete your task like this:

private void myList_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
    ListBoxItem item = (sender as ListBox).ItemContainerGenerator.ContainerFromIndex((sender as ListBox).SelectedIndex) as ListBoxItem;
    List<StackPanel> controlList = new List<StackPanel>();
    SearchForControls<StackPanel>(item, ref controlList);
    string text = (controlList[0].Children[1] as TextBlock).Text;
}

In above code, in controlList you will get all StackPanels from you SelectedItem (accessed by SelectedIndex). For this example I assume that you have one StackPanel - hopefuly this will help you. Try to debug it and you will see how it works.

Upvotes: 2

A.K.
A.K.

Reputation: 3331

it would be better and easier to subscribe to textblocks Tap event instead

<DataTemplate>
<Textblock name="myTxtBlock" Tap="myTxtBlock_Tap"/>
</DataTemplate>

in code: 

private void myTxtBlock_Tap(object sender, GestureEventArgs e)
{
string text=(Sender as Textblock).Text;
}

Upvotes: 0

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