[Solved] PropertyChanged always null in whole application

[Michele]

Hello,
I've got a SL4 application I've been developing for almost 3 years... I've got a strange and weird problem.... all times I try to bind a class that implements INotifyPropertyChanged I got null on the event that should notify the change....

I've cross checked my code, copied the code from another working app... I don't know what's wrong

Here's my code

public partial class AnnullaQuestionarioUC : RadWindow, INotifyPropertyChanged
    {

        public event PropertyChangedEventHandler PropertyChanged;

        public void NotifyPropertyChanged(string propertyName)
        {
            if (PropertyChanged != null)
            {
                PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
            }
        }

private ObservableCollection<TipoAnnulloObj> listaTipoAnnullamento;
        public ObservableCollection<TipoAnnulloObj> ListaTipoAnnullamento
        {
            get
            {
                return listaTipoAnnullamento;
            }
            set
            {
                listaTipoAnnullamento = value;
                NotifyPropertyChanged("ListaTipoAnnullamento");
            }
        }
//[omitt]
}

Since it's happening in the entire application what can went wrong?

[Ivan Ivanov]

Hi Paolo,

The implementation illustrated on the snippet seems to be right. I believe that the source of this issue does not lay there. Would you please check your code for some of the following cases: Binding to a CLR property, which is somewhere else modified through its private field. Or maybe you have a duplicate instance of AnnullaQuestionarioUC (i.e. having simultaneously a binding that uses a static resource instance of AnnullaQuestionarioUCas a Source and a DataContext for the same element with a value of AnnullaQuestionarioUC?). In case that you have not found anything particularly suspicious, feel free to send us a runnable project that isolates the issue, so that we would be able to debug it on our side.

Kind regards,
Ivan Ivanov
the Telerik team