Change the TextBlock Text present in a DataTemplate

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I have a DataTemplate in which I have a Grid layout with 2 RowDefinitions. I have a TextBox in the first row and a ComboBox in the second row.

I have defined the DataTemplate in my ResourceDictionary.

This is the code for the DataTemplate:

<DataTemplate x:Key="myDataTemplate">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition />
            <RowDefinition />
        </Grid.RowDefinitions>
        <TextBox Name ="txtChannelDescription" Grid.Row="0" Margin="1,1,1,1"/>
        <ComboBox Name="cmbChannelTag" Grid.Row="1" IsReadOnly="True" Margin="1,1,1,1"/>
    </Grid>
</DataTemplate>

I am using this DataTemplate in code behind as:
(DataTemplate)FindResource("myDataTemplate")

How do I set the Value of TextBox.Text and the ItemSource of the ComboBox at runtime?

Posted 7-Aug-13 21:55pm

Abhishek Durvasula

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Punamchand Dhuppad · Answer 1 · 2013-08-08T01:28:00

Hey Abhishek, Just look at here what I did,

1) First of all I took one ListBox in Xaml and assign its ItemTemplate property like this -

<listbox name="ItemList" itemtemplate="{StaticResource myDataTemplate}" />

2)In code behind I wrote code something like this-

C#

List<string> Items = new List<string>();
 public MainWindow()
    {

           InitializeComponent();


           Items.Add("Abc");
           ItemList.ItemsSource = Items;

           ItemList.SelectionChanged += ItemList_SelectionChanged;
       }


void ItemList_SelectionChanged(object sender, SelectionChangedEventArgs e)
       {
           ListBoxItem myListBoxItem = (ListBoxItem)(ItemList.ItemContainerGenerator.ContainerFromItem(ItemList.SelectedItem));
           ContentPresenter myContentPresenter = FindVisualChild<contentpresenter>(myListBoxItem);

           // Finding textBlock from the DataTemplate that is set on that ContentPresenter
           DataTemplate myDataTemplate = myContentPresenter.ContentTemplate;
           TextBox myTextBlock = (TextBox)myDataTemplate.FindName("txtChannelDescription", myContentPresenter);

           if(myTextBlock != null)
           {
               myTextBlock.Text = "Enter Your Text Here";
           }
       }


 private childItem FindVisualChild<childitem>(DependencyObject obj) where childItem : DependencyObject
       {
           for (int i = 0; i < VisualTreeHelper.GetChildrenCount(obj); i++)
           {
               DependencyObject child = VisualTreeHelper.GetChild(obj, i);
               if (child != null && child is childItem)
                   return (childItem)child;
               else
               {
                   childItem childOfChild = FindVisualChild<childitem>(child);
                   if (childOfChild != null)
                       return childOfChild;
               }
           }
           return null;
       }

So In this way by using "FindName" API of datatemplate, you can find the child element>