WPF - code style change

Question

I have a list box that displays the results of a TFS request. I want to change the ListBoxItem style in the code behind to have columns that are included in the query results.

The style for ListBoxItem is defined in my Windows.Resoruces section. I tried this:

public T GetQueryResultsElement<T>(string name) where T : DependencyObject
{
    ListBoxItem myListBoxItem =
        (ListBoxItem)(lstQueryResults.ItemContainerGenerator.ContainerFromIndex(0));

    // Getting the ContentPresenter of myListBoxItem
    ContentPresenter myContentPresenter =
        myListBoxItem.Template.LoadContent().FindVisualChild<ContentPresenter>();

    // Finding textBlock from the DataTemplate that is set on that ContentPresenter
    DataTemplate myDataTemplate = myContentPresenter.ContentTemplate;  <------+
    T myControl = (T)myDataTemplate.FindName(name, myContentPresenter);       |
                                                                              |    
    return (T)myControl;                                                      |
}                                                                             |
                                                                              |
        ContentTemplate is null ----------------------------------------------+

But the ContentTemplate is null. I got this code from here and then modified it by calling LoadContent (the source code gave null for ContentPresenter).

Anyway. If you know a way to change the existing style in the code, for which I would like to see it.

---

Features if you want them:
I am going to WrapPanel in my ListBoxItem style. This is what I want to add additional TextBlock elements to.

Here is part of my style:

<!--Checkbox ListBox-->
<Style x:Key="CheckBoxListStyle" TargetType="ListBox">
    <Style.Resources>
        <Style x:Key="ListBoxItemStyle" TargetType="ListBoxItem">
            <Setter Property="Tag" Value="{Binding Id}"/>
            <Setter Property="Background">
                <Setter.Value>
                    <Binding Path="Type" Converter="{StaticResource WorkItemTypeToColorConverter}" />
                </Setter.Value>
            </Setter>
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="ListBoxItem">
                        <Border BorderThickness="1" BorderBrush="#D4D4FF">
                            <Grid Width="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type WrapPanel}}, Path=ActualWidth}" ScrollViewer.CanContentScroll="True" Margin="2">
                                <Grid.ColumnDefinitions>
                                    <ColumnDefinition Width="20" />
                                    <ColumnDefinition Width="*" />
                                    <ColumnDefinition Width="30" />
                                </Grid.ColumnDefinitions>
                                <Grid.Background>
                                    <Binding Path="Type" Converter="{StaticResource WorkItemTypeToColorConverter}" />
                                </Grid.Background>

                                <CheckBox VerticalAlignment="Center" Grid.Column="0" IsChecked="{Binding IsSelected,
                                      RelativeSource={RelativeSource TemplatedParent},
                                      Mode=TwoWay}" Name="chkIsSelected" />
                                <WrapPanel Grid.Column="1" Margin="5,0,5,0" Name="QueryColumns">
                                    <TextBlock VerticalAlignment="Center"  Text="{Binding Id}" Name="txtID" />
                                    <TextBlock VerticalAlignment="Center" Margin="5,0,5,0" Text="{Binding Title}" Name="txtTitle" />
                                </WrapPanel>

Answer 1

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:

class NameValuePair 
{
    public string Name { get; set; }
    public object Value { get; set; }
}

public IEnumerable<IEnumerable<NameValuePair>> EnumerateResultSet(DataTable resultSet)
{
    foreach (DataRow row in resultSet.Rows)
        yield return EnumerateColumns(resultSet, row);
}

public IEnumerable<NameValuePair> EnumerateColumns(DataTable resultSet, DataRow row)
{
    foreach (DataColumn column in resultSet.Columns)
        yield return new NameValuePair
            { Name = column.ColumnName, Value = row[column] };
}

, DataTable, :

myResultsList.ItemsSource = EnumerateResultSet(myDataTable);

XAML :

<Window.Resources>
    <DataTemplate x:Key="ColumnTemplate">
        <Border BorderBrush="Black" BorderThickness="1" CornerRadius="2" Padding="2">
            <WrapPanel>
                <TextBlock Text="{Binding Name}" Margin="0,0,5,0"/>
                <TextBlock Text="{Binding Value}" Margin="0,0,10,0"/>
            </WrapPanel>
        </Border>
    </DataTemplate>
    <DataTemplate x:Key="RowTemplate">
        <Grid>
            <ItemsControl 
                ItemsSource="{Binding}" 
                ItemTemplate="{StaticResource ColumnTemplate}"
                Margin="0,5,0,5"/>
        </Grid>
    </DataTemplate>
</Window.Resources>
<Grid>
    <ListBox Name="myResultsList" ItemTemplate="{StaticResource RowTemplate}"/>
</Grid>

: