Access TextBlock.Text Inside a Button

Question

I have a set of Buttons that are styled as so;

<Button x:Name="rhsNavButton1">
    <TextBlock TextWrapping="Wrap" TextAlignment="Center"/>
</Button>

I want to loop through these Buttons and modify the TextBlock.Text inside them. So far I have done something like this;

int j = 11;
foreach (UIElement control in RHSNavButtonGrid.Children)
{
    if (control.GetType() == typeof(Button))
    {
        var tb = ((control as Button).Content).Children.OfType<TextBlock>().FirstOrDefault();
        tb.Text = buttonNames.Rows[j][0].ToString();
        j++;
    }
}   

But I am having no luck in accessing the TextBlock ( NullException ). How can I access the Textblock's text property when it inside the Button programtically?

Answer 1

Since the TextBlock is placed inside your button as content directly and you don't use any Container Controls like StackPanel you don't need to use Children . Just use this:

int j = 11;
foreach (UIElement control in RHSNavButtonGrid.Children)
{
    if (control.GetType() == typeof(Button))
    {
        var tb = ((control as Button).Content) as TextBlock;
        tb.Text = buttonNames.Rows[j][0].ToString();
        j++;
    }
}   

Answer 2

Use var tb = ((control as Button).Content as TextBlock); instead of (control as Button).Content).Children.OfType<TextBlock>().FirstOrDefault();

int j = 11;
foreach (UIElement control in RHSNavButtonGrid.Children)
{
    if (control.GetType() == typeof(Button))
    {
        var tb = ((control as Button).Content  as TextBlock);
        tb.Text = buttonNames.Rows[j][0].ToString();
        j++;
    }
}