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.

Data Model:

public class AddressBook : INotifyPropertyChanged {     private int _houseNumber;     public int HouseNumber     {         get { return _houseNumber; }         set { _houseNumber = value; NotifyPropertyChanged('HouseNumber'); }     }      public event PropertyChangedEventHandler PropertyChanged;      protected void NotifyPropertyChanged(string sProp)     {         if (PropertyChanged != null)         {             PropertyChanged(this, new PropertyChangedEventArgs(sProp));         }     } } 

Binding in Code:

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; // Text block displays '123' but PropertyChanged event fires 

When the data is first bound, the text block is updated with the correct house number. Then, if I change the house number in code later, the book’s PropertyChanged event fires, but the text block is not updated. Can anyone tell me why?

Thanks, Ben

Answer 1

The root of it was that the string I passed to PropertyChangedEventArgs did not EXACTLY match the name of the property. I had something like this:

public int HouseNumber {     get { return _houseNumber; }     set { _houseNumber = value; NotifyPropertyChanged('HouseNum'); } } 

Where it should be this:

public int HouseNumber {     get { return _houseNumber; }     set { _houseNumber = value; NotifyPropertyChanged('HouseNumber'); } } 

Yikes! Thanks for the push in the right direction.