Problem with WPF Data Binding Defined in Code Not Updating UI Elements

Question

I need to define new UI Elements as well as data binding in code because they will be implemented after run-time. Here is a simplified version of what I am trying to do.

Answer 1

I've just cut+pasted your code (and added a little), and it works fine for me:

    public Window1()
    {
        InitializeComponent();

        AddressBook book = new AddressBook();
        book.HouseNumber = 123;
        TextBlock tb = new TextBlock();
        Binding bind = new Binding("HouseNumber");
        bind.Source = book;
        bind.Mode = BindingMode.OneWay;
        tb.SetBinding(TextBlock.TextProperty, bind); // Text block displays "123"
        myGrid.Children.Add(tb);
        book.HouseNumber = 456; 
    }

    private void TestButton_Click(object sender, RoutedEventArgs e)
    {
        AddressBook book = 
           (AddressBook(TextBlock)
              myGrid.Children[0])
              .GetBindingExpression(TextBlock.TextProperty)
              .DataItem;

        book.HouseNumber++;
    }

Displays 456 on startup, clicking the button makes the number in the TextBlock increment just fine.

Perhaps you are looking in the wrong place for the cause of the problem?