Access controls inside listbox c# (windows Phone 8)

Question

         my xaml  code..
      <phone:PhoneApplicationPage.Resources>
    <DataTemplate x:Key="DataTemplate1" >
        <Border BorderBrush="LightGray" BorderThickness="1" Height="150"            Width="500" >
            <Grid Width="500" Height="150" Background="White" >
                <Grid.ColumnDefinitions>
                    <ColumnDefinition Width="0.9*"/>
                    <ColumnDefinition Width="2.5*"/>
                    <ColumnDefinition Width="1.5*"/>

                </Grid.ColumnDefinitions>
                <Grid.RowDefinitions>
                    <RowDefinition Height="*"/>
                </Grid.RowDefinitions>
                <Image Name="imgitem"  Grid.Column="0" Height="Auto" Width="Auto" Source="{Binding ImgSource}" Margin="0,5,4,4" HorizontalAlignment="Left" />
                <TextBlock x:Name="txtbindprice"  Text="{Binding _PRICE,ConverterCulture=en-IN,StringFormat=C}" TextWrapping="Wrap"  Grid.Column="1"  Width="350"  Foreground="Black" Height="60" Margin="40,70,20,-10"/>
                <TextBlock x:Name="txtFinalTotal"  Text="{Binding _FinalTotal}" TextWrapping="Wrap"  Grid.Column="1"  Width="350"  Foreground="Red" Height="60" Margin="40,115,20,-10"/>
                <TextBlock x:Name="txtITMNAME"  Text="{Binding _ITMNAME }" Padding="1"  Tap="ItmName_Tapped" TextDecorations="Underline" FontSize="24" TextWrapping="Wrap" Grid.Column="1"  FontWeight="Normal" TextTrimming="WordEllipsis"  Foreground="OrangeRed" Width="Auto"  Height="150"  Margin="30,25,10,-10"/>
                <CheckBox  Grid.Column="2" Grid.Row="0" Background="Black" Foreground="Black" BorderThickness="4" BorderBrush="Red" Margin="10,20,-15,10"  Checked="CheckBox_Checked" Unchecked="CheckBox_UnChecked"  /> 

            </Grid>
        </Border>
    </DataTemplate>

     <ListBox Height="Auto" Name="lstbxmanual" SelectionMode="Extended" ItemTemplate="{StaticResource DataTemplate1 }"  Width="475" Margin="2,192,0,-39" Background="White"  HorizontalAlignment="Left" Grid.RowSpan="2">
    </ListBox>

I want to access textblocks inside listbox based on selected index

accessing textblock 
  string  a =txtbindprice.text

wont work as they are inside data template of listbox..

I came across visual child tree methods and some other examples..i cant find much info..

please help me regarding this...

Why visual child tree methods didn't work for you? have you tried [this answer](http://stackoverflow.com/a/18441797/1648849) or [this one](http://stackoverflow.com/a/15191380/1648849)? — Bahman_Aries, Jul 22 '15 at 11:57
thank you ..please be specific..it will be useful for my learning purpose.. — Kartiikeya, Jul 22 '15 at 12:23

Bahman_Aries · Answer 1 · 2015-07-24T15:30:06.260

The following method finds currently selected list-box item:

    private ListBoxItem FindSelectedListBoxItem(DependencyObject control)
    {
        int childNumber = VisualTreeHelper.GetChildrenCount(control);
        for (int i = 0; i < childNumber; i++)
        {
            DependencyObject child = VisualTreeHelper.GetChild(control, i);
            FrameworkElement fe = child as FrameworkElement;
            // Not a framework element or is null
            if (fe == null) return null;

            if (child is ListBoxItem && ((ListBoxItem)child).IsSelected)
            {
                // Found the control so return
                return (ListBoxItem)child;
            }

            else
            {
                // Not found it - search children
                ListBoxItem nextLevel = FindSelectedListBoxItem(child);
                if (nextLevel != null)
                    return nextLevel;
            }
        }
        return null;
    }

Below method finds any child control with a certain name from a given root control:

private DependencyObject FindChildControl<T>(DependencyObject control, string ctrlName)
{
    int childNumber = VisualTreeHelper.GetChildrenCount(control);
    for (int i = 0; i < childNumber; i++)
    {
        DependencyObject child = VisualTreeHelper.GetChild(control, i);
        FrameworkElement fe = child as FrameworkElement;
        // Not a framework element or is null
        if (fe == null) return null;

        if (child is T && fe.Name == ctrlName)
        {
            // Found the control so return
            return child;
        }
        else
        {
            // Not found it - search children
            DependencyObject nextLevel = FindChildControl<T>(child, ctrlName);
            if (nextLevel != null)
                return nextLevel;
        }
    }
    return null;
}

Now you can use the first method to get currently selected ListBoxItemand then pass it to the second method to retrieve any control inside this ListBoxItem (e.g. txtbindprice):

ListBoxItem item = FindSelectedListBoxItem(this);
TextBlock txtPrice = FindChildControl<TextBlock>(item , "txtbindprice") as TextBlock;
string a = txtPrice.Text;

Update

You can add SelectionChanged event to your ListBox like this:

 <ListBox Height="Auto" Name="lstbxmanual" SelectionChanged="OnSelectionChanged">
</ListBox>

And then retrieve a certain TextBlock.Text (e.g. txtbindprice) this way:

public void OnSelectionChanged(object sender, SelectionChangedEventArgs args)
{
    ListBoxItem item = FindSelectedListBoxItem((ListBox(sender)));
    TextBlock txtPrice = FindChildControl<TextBlock>(item , "txtbindprice") as TextBlock;
    string a = txtPrice.Text;
}

iam looking for a procedure which gets values of all textblocks inside listbox....i have more than 100 index in listbox to select... — Kartiikeya, Jul 22 '15 at 11:26
Still you don't have to get it from `txtbindprice.text`. If your `ListBox` has an `ItemsSource` you can get each `_PRICE` from this `ItemsSource` through a loop that iterates 100 times. — Bahman_Aries, Jul 22 '15 at 11:30
index of items in my listbox will be varied ,as i am implementing search feature for the listbox.. so items source mismatches some times.. — Kartiikeya, Jul 22 '15 at 11:40
i have a bunch of items in listbox.... its retrieving mismatched data.. how to get accurate data based on selecteditem index — Kartiikeya, Jul 22 '15 at 12:55
What do you mean? `this` inside `FindSelectedListBoxItem(this)` is an instance of your main window or if you're using this method inside `selectionChanged` event, you could use `(ListBox)sender` instead. — Bahman_Aries, Jul 23 '15 at 10:53
@Kartiikeya if by "FindSelectedListBoxItem(this) consists of?" you mean "where is the body of this method?" then It's right here (the first method in my answer). — Bahman_Aries, Jul 24 '15 at 07:16
does FindSelectedListBoxItem(this) sholud be placed inside vent handler of listbox or any other control..?? @bahram — Kartiikeya, Jul 24 '15 at 09:23
the code inside OnSelectionChanged event, i need to use that particular code for checkbox checked event .. errror in dependence object for check box. it s only returning first value...please help... — Kartiikeya, Jul 27 '15 at 11:55

Access controls inside listbox c# (windows Phone 8)

1 Answers1