CODEWITHSUNDEEP
c#wpfxamlmvvmlistbox
user3182266
user3182266

Reputation: 1330

Unable to fill in a ListBox in WPF using MVVM

Hi I want to fill a list box with the items of an observable collection. I have in my XAML file:

<catel:UserControl x:Class="Musat.Classificator.CatelMVVM.Views.StopControlView"
         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
         xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
         xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
         xmlns:catel="http://catel.codeplex.com"
         mc:Ignorable="d" 
         d:DesignHeight="300" d:DesignWidth="300">

<catel:UserControl.Resources>
    <CollectionViewSource Source="{Binding Something}" x:Key="cvsStops" />        
</catel:UserControl.Resources>

<catel:StackGrid x:Name="LayoutRoot">
    <ListBox ItemsSource="{Binding Source={StaticResource cvsStops}}" />
</catel:StackGrid>

and in my ViewModel I have:

 class StopViewModel : ViewModelBase
{
   public StopViewModel()
    {
        ObservableCollection<String> Something = new ObservableCollection<String>();
        Something.Add("A");
        Something.Add("B");
        Something.Add("C");
        Something.Add("D");
        Something.Add("E");
        Something.Add("F");      
    }
}

However the list box is not filled with any data. Is there something that I am doing wrong because I can't find it?

Upvotes: 1

Views: 1189

Answers (1)

St&#237;gandr
St&#237;gandr

Reputation: 2902

We are sort of guessing here, but could it be as simple as this? You must bind to either a property(with INotifyPropertyChanged) or a Dependency Property in a DO.

    private ObservableCollection<string> something = new ObservableCollection<String> { "A", "B", "C", "D", "E", "F" };
    public ObservableCollection<String> Something // Must be property or DP to be bound!
    {
        get { return something; }
        set
        {
            if (Equals(value, something)) return;
            something = value;
            RaisePropertyChanged("Something");
        }
    }

Hard to do tell without your full code. How have you set your datacontext? Why are you not binding directly to this property? 

<ListBox ItemsSource="{Binding Something}"/>

Check your debug output when starting the application.

Cheers

Stian

Upvotes: 3

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