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POINotifyCollectionChanged is not updating the UI
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  1. POINotifyCollectionChanged is not updating the UI
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    copied!<p>I have a class as shown below. All the functions I have removed for brevity</p> <pre><code>public class PersonCollection:IList&lt;Person&gt; {} </code></pre> <p>Now I have one more Model class as shown below. AddValueCommand is class deriving from ICommand which again I am omiting.</p> <pre><code>public class DataContextClass:INotifyCollectionChanged { private PersonCollection personCollection = PersonCollection.GetInstance(); public IList&lt;Person&gt; ListOfPerson { get { return personCollection; } } public void AddPerson(Person person) { personCollection.Add(person); OnCollectionChanged(NotifyCollectionChangedAction.Reset); } public event NotifyCollectionChangedEventHandler CollectionChanged = delegate { }; public void OnCollectionChanged(NotifyCollectionChangedAction action) { if (CollectionChanged != null) { CollectionChanged(this, new NotifyCollectionChangedEventArgs(action)); } } ICommand addValueCommand; public ICommand AddValueCommand { get { if (addValueCommand == null) { addValueCommand = new AddValueCommand(p =&gt; this.AddPerson(new Person { Name = "Ashish"})); } return addValueCommand; } } } </code></pre> <p>In the main window I am binding my UI to Model as shown below </p> <pre><code> DataContextClass contextclass = new DataContextClass(); this.DataContext = new DataContextClass(); </code></pre> <p>And My UI looks like as shown below </p> <pre><code>&lt;ListBox Margin="5,39,308,113" ItemsSource="{Binding Path=ListOfPerson}"&gt; &lt;ListBox.ItemTemplate&gt; &lt;DataTemplate&gt; &lt;TextBox Height="20" Text="{Binding Path=Name}"&gt;&lt;/TextBox&gt; &lt;/DataTemplate&gt; &lt;/ListBox.ItemTemplate&gt; &lt;/ListBox&gt; &lt;Button Content="Button" HorizontalAlignment="Left" Command="{Binding Path=AddValueCommand}" Margin="233,39,0,73" /&gt; </code></pre> <p>My List Box is not updating with the new value when button is clicked. What I am missing here.</p>
 

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