Again, ObservableCollection doesnt Update item - wpf

Question

Thats my first project using MVVM , MVVM light.
I have a listbox, that gets refreshed from the PersonList Observable collection, adding and removing refresh it normal. the problem is when editing an item.
I looked for all the solutions for this problem, nothing worked, which make me think that I missed something.
so here is the code :
public class AdminViewModel : ApplicationPartBaseViewModel
{
private ObservableCollection<Person> personList;
public AdminViewModel()
{
this.context = new Entities();
this.SavePersonCommand = new RelayCommand(() => this.SavePerson ());
this.PersonList = new ObservableCollection<Peson>(context.Person.OrderBy(o => o.PersonName).ToList());
}
public ObservableCollection<Person> PersonList
{
get
{
return personList;
}
set
{
this.personList = value;
RaisePropertyChanged("PersonList");
}
}
private void SavePerson()
{
//Add and update code here
this.context.SaveChanges();
RaisePropertyChanged("PersonList");
}
}
Person Class is Autogenerated template from the DataModel edmx
//------------------------------------------------------------------------------
// <auto-generated>
// This code was generated from a template.
//
// Changes to this file may cause incorrect behavior and will be lost if
// the code is regenerated.
// </auto-generated>
//------------------------------------------------------------------------------
public partial class Person
{
#region Primitive Properties
public virtual int PersonId
{
get;
set;
}
public virtual string PersonName
{
get;
set;
}
public virtual Nullable<int> PersonAge
{
get;
set;
}
#endregion
#region Navigation Properties
public virtual ICollection<Humans> Humans
{
get
{
if (_human == null)
{
var newCollection = new FixupCollection<Human>();
newCollection.CollectionChanged += FixupHuman;
_human = newCollection;
}
return _human;
}
set
{
if (!ReferenceEquals(_human, value))
{
var previousValue = _human as FixupCollection<Human>;
if (previousValue != null)
{
previousValue.CollectionChanged -= FixupHuman;
}
_human = value;
var newValue = value as FixupCollection<Human>;
if (newValue != null)
{
newValue.CollectionChanged += FixupAssets;
}
}
}
}
private ICollection<Human> _human;
#endregion
#region Association Fixup
private void FixupHuman(object sender, NotifyCollectionChangedEventArgs e)
{
if (e.NewItems != null)
{
foreach (Human item in e.NewItems)
{
if (!item.Person.Contains(this))
{
item.Person.Add(this);
}
}
}
if (e.OldItems != null)
{
foreach (Human item in e.OldItems)
{
if (item.Person.Contains(this))
{
item.Person.Remove(this);
}
}
}
}
#endregion
}
I thought that MVVM light update the item when I call RaisePropertyChanged.
I am so confused.
Thanks in advance.

Answer 1

First option is try to get your auto-generated class to implement INPC if you can. Have a look at Fody.PropertyChanged
If that's not possible, since it does have it's properties as "virtual", we can over-ride them in a derived class such as
public class ObservablePerson : Person, INotifyPropertyChanged {
public override int PersonId {
get {
return base.PersonId;
}
set {
base.PersonId = value;
OnPropertyChanged();
}
}
public override string PersonName {
get {
return base.PersonName;
}
set {
base.PersonName = value;
OnPropertyChanged();
}
}
public override int? PersonAge {
get {
return base.PersonAge;
}
set {
base.PersonAge = value;
OnPropertyChanged();
}
}
public event PropertyChangedEventHandler PropertyChanged;
[NotifyPropertyChangedInvocator]
protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null) {
PropertyChangedEventHandler handler = PropertyChanged;
if (handler != null)
handler(this, new PropertyChangedEventArgs(propertyName));
}
}
Now in your AdminViewModel work with objects of type ObservablePerson than Person