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POAgain, ObservableCollection doesnt Update item
 

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  1. POAgain, ObservableCollection doesnt Update item
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    <p>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.</p> <p>I looked for all the solutions for this problem, nothing worked, which make me think that I missed something. </p> <p>so here is the code : </p> <pre><code> public class AdminViewModel : ApplicationPartBaseViewModel { private ObservableCollection&lt;Person&gt; personList; public AdminViewModel() { this.context = new Entities(); this.SavePersonCommand = new RelayCommand(() =&gt; this.SavePerson ()); this.PersonList = new ObservableCollection&lt;Peson&gt;(context.Person.OrderBy(o =&gt; o.PersonName).ToList()); } public ObservableCollection&lt;Person&gt; PersonList { get { return personList; } set { this.personList = value; RaisePropertyChanged("PersonList"); } } private void SavePerson() { //Add and update code here this.context.SaveChanges(); RaisePropertyChanged("PersonList"); } } </code></pre> <p>Person Class is Autogenerated template from the DataModel edmx</p> <pre><code> //------------------------------------------------------------------------------ // &lt;auto-generated&gt; // This code was generated from a template. // // Changes to this file may cause incorrect behavior and will be lost if // the code is regenerated. // &lt;/auto-generated&gt; //------------------------------------------------------------------------------ public partial class Person { #region Primitive Properties public virtual int PersonId { get; set; } public virtual string PersonName { get; set; } public virtual Nullable&lt;int&gt; PersonAge { get; set; } #endregion #region Navigation Properties public virtual ICollection&lt;Humans&gt; Humans { get { if (_human == null) { var newCollection = new FixupCollection&lt;Human&gt;(); newCollection.CollectionChanged += FixupHuman; _human = newCollection; } return _human; } set { if (!ReferenceEquals(_human, value)) { var previousValue = _human as FixupCollection&lt;Human&gt;; if (previousValue != null) { previousValue.CollectionChanged -= FixupHuman; } _human = value; var newValue = value as FixupCollection&lt;Human&gt;; if (newValue != null) { newValue.CollectionChanged += FixupAssets; } } } } private ICollection&lt;Human&gt; _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 } </code></pre> <p>I thought that MVVM light update the item when I call RaisePropertyChanged. I am so confused. </p> <p>Thanks in advance.</p>
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    1. COitems within an `ObservableCollection<T>` have to implement INPC themselves for your "editing" changes to propagate to the UI.
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    2. COwhen I try to implement it , it says its already implemented in the mvvm light. and I should use override or new keywords.
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    3. COplease post the Person class code
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      1. USmakc
 

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