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PORaisePropertyChanged doesn't work for ObservableCollection
 

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  1. PORaisePropertyChanged doesn't work for ObservableCollection
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    <p>I have a really weird problem with update UI using MVVM Light Toolkit. The RaisePropertyChanged doesn't work at all for my ObservableCollection. </p> <p>Here is the XAML code:</p> <pre><code>&lt;ListBox x:Name="list" ItemsSource="{Binding ModelList}" SelectedItem="{Binding SelectedItem, Mode=TwoWay}"&gt; &lt;ListBox.ItemTemplate&gt; &lt;DataTemplate&gt; &lt;StackPanel Orientation="Horizontal"&gt; &lt;TextBlock Text="{Binding Name}"&gt;&lt;/TextBlock&gt; &lt;CheckBox IsChecked="{Binding IsChecked}"&gt;&lt;/CheckBox&gt; &lt;/StackPanel&gt; &lt;/DataTemplate&gt; &lt;/ListBox.ItemTemplate&gt; &lt;interaction:Interaction.Triggers&gt; &lt;interaction:EventTrigger EventName="SelectionChanged"&gt; &lt;cmd:EventToCommand Command="{Binding TempCommand}" CommandParameter="{Binding ElementName=list, Path=SelectedItem}" PassEventArgsToCommand="True"/&gt; &lt;/interaction:EventTrigger&gt; &lt;/interaction:Interaction.Triggers&gt; &lt;/ListBox&gt; </code></pre> <p>And there is ViewModel code part:</p> <pre><code>private Model _selectedItem; public Model SelectedItem { get { return _selectedItem; } set { _selectedItem = value; RaisePropertyChanged("SelectedItem"); } } private ObservableCollection&lt;Model&gt; _modelList; public ObservableCollection&lt;Model&gt; ModelList { get { return _modelList; } set { _modelList = value; RaisePropertyChanged("ModelList"); } } public RelayCommand&lt;Model&gt; TempCommand { get; private set; } /// &lt;summary&gt; /// Initializes a new instance of the MainViewModel class. /// &lt;/summary&gt; public MainViewModel() { modelList = new ObservableCollection&lt;Model&gt;() { new Model() { IsChecked = true, Name = "Temp1" }, new Model() { IsChecked = false, Name = "Temp2" }, new Model() { IsChecked = false, Name = "Temp3" } }; ModelList = modelList; TempCommand = new RelayCommand&lt;Model&gt;(Model_SelectedItem); } private void Model_SelectedItem(Model item) { // What should I do here? } </code></pre> <p>When I change the ModelList - there is no reaction from ListBox UI. </p> <p>Anyone can help me ?</p>
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    1. USMateusz Dembski
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    1. COProblem Solved. Model class have to derived from ObservableObject and its properties have to fire RaisePropertyChanged event.
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      1. PORaisePropertyChanged doesn't work for ObservableCollection
      1. USMateusz Dembski
    2. COif you got it to work, then try removing RaiseProperty on ObservableCollection - it doesn't need it...
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      1. PORaisePropertyChanged doesn't work for ObservableCollection
      1. USdenis morozov
    3. COYes, of course I did it !
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      1. PORaisePropertyChanged doesn't work for ObservableCollection
      1. USMateusz Dembski
 

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