Windows Phone 8.1 RT view not updating (MVVM) - xaml

Question

I'm designing a profile page for users where they can edit their personal info. I'm using a PersonViewModel (which contains the current signed in person) to display the current info about the User. The fields to edit the user's info are bound to a validation model. After pressing the 'execute changes' button and I get a response of the server (HTTPStatusCode Ok + the altered user object), I alter the fields of the existing object according to the changes. Then I used setter injection to update my PersonViewModel... When debugging, I can see that my objects are all up-to-date but my view is still displaying the old info... What am I doing wrong?`
This is the code that get's executed when I press the button to execute my changes:
private async void ChangeInfoButton(object sender, RoutedEventArgs e)
{
User user;
List<ErrorInfo> errors;
if (_profileInformationValidationModel.TryGetUser(out user, out errors))
{
var response = await Session.Instance.DataProvider.UpdaterUserInfo(user);
if (response.IsSuccess)
{
/*SignedInUserInfo = AlteredUserInfo*/
Session.Instance.User.Information = user.Information;
_personViewModel.SetPerson(user.Information);
var d1 = new MessageDialog("Uw gegevens werden succesvol gewijzigd.");
d1.ShowAsync();
AnnulInfoButton(sender, e);
}
`
And this is the PersonViewModel:
public class PersonViewModel
{
private Person _person;
public void SetPerson(Person p)
{
_person = p;
}
public PersonViewModel(Person person)
{
_person = person;
}
public string Street
{
get { return _person.Street; }
}
public string HouseNumber
{
get { return _person.HouseNumber; }
}
public string Bus
{
get { return _person.Bus; }
}
public string Email
{
get { return _person.Email; }
}

Answer 1

Your view model should implement the INotifyPropertyChanged interface.
Look into using a framework like MVVM Light which does most of this work for you.
You can add it to your project using NuGet.
This is how your model and view-model should look:
public class Person
{
public string Street { get; set; }
public string HouseNumber { get; set; }
public string Bus { get; set; }
public string Email { get; set; }
}
public class PersonViewModel : System.ComponentModel.INotifyPropertyChanged
{
private Person _person;
public void SetPerson(Person person)
{
_person = person;
Street = person.Street;
HouseNumber = person.HouseNumber;
Bus = person.Bus;
Email = person.Email;
}
public PersonViewModel(Person person)
{
SetPerson(person);
}
#region Street (INotifyPropertyChanged Property)
private string _street;
public string Street
{
get { return _street; }
set
{
if (_street != value)
{
_street = value;
RaisePropertyChanged("Street");
}
}
}
#endregion
#region HouseNumber (INotifyPropertyChanged Property)
private string _houseNumber;
public string HouseNumber
{
get { return _houseNumber; }
set
{
if (_houseNumber != value)
{
_houseNumber = value;
RaisePropertyChanged("HouseNumber");
}
}
}
#endregion
#region Bus (INotifyPropertyChanged Property)
private string _bus;
public string Bus
{
get { return _bus; }
set
{
if (_bus != value)
{
_bus = value;
RaisePropertyChanged("Bus");
}
}
}
#endregion
#region Email (INotifyPropertyChanged Property)
private string _email;
public string Email
{
get { return _email; }
set
{
if (_email != value)
{
_email = value;
RaisePropertyChanged("Email");
}
}
}
#endregion
public event System.ComponentModel.PropertyChangedEventHandler PropertyChanged;
private void RaisePropertyChanged(string p)
{
var propertyChanged = PropertyChanged;
if (propertyChanged != null)
{
propertyChanged(this, new System.ComponentModel.PropertyChangedEventArgs(p));
}
}
}