WPF Binding Problems

Question

I'm using WPF Toolkit's Charting, but I'm having a problem with getting it to bind to my ViewModel. Nothing shows up. I have the MainWindow.DataContext = MainWindowViewModel if you're wondering. This is what I have:

MainWindow.xaml

<chartingToolkit:Chart Grid.Row="2">
    <chartingToolkit:ColumnSeries Name="line_chart" 
                                  IndependentValuePath="Key"
                                  DependentValuePath="Value" 
                                  ItemsSource="{Binding Me}"/>
</chartingToolkit:Chart>

MainWindowViewModel.cs

class MainWindowViewModel
{
    public List<KeyValuePair<string, int>> Me { get; set; }

    public MainWindowViewModel(Model model)
    {
        this.model = model;

        me.Add(new KeyValuePair<string, int>("test", 1));
        me.Add(new KeyValuePair<string, int>("test1", 1000));
        me.Add(new KeyValuePair<string, int>("test2", 20));
        me.Add(new KeyValuePair<string, int>("test3", 500));
    }

    Model model;

    List<KeyValuePair<string, int>> me = new ObservableCollection<KeyValuePair<string,int>>();
}

Grant Winney · Accepted Answer · 2014-12-11 02:36:13Z

1

I haven't used that chart tool before, but you're binding to a public Me property that has no reference whatsoever to the private me field that you're adding values to.

Remove the private field and try this instead:

class MainWindowViewModel
{
    public ObservableCollection<KeyValuePair<string, int>> Me { get; private set; }

    public MainWindowViewModel(Model model)
    {
        this.model = model;

        // Instantiate in the constructor, then add your values
        Me = new ObservableCollection<KeyValuePair<string, int>>();

        Me.Add(new KeyValuePair<string, int>("test", 1));
        Me.Add(new KeyValuePair<string, int>("test1", 1000));
        Me.Add(new KeyValuePair<string, int>("test2", 20));
        Me.Add(new KeyValuePair<string, int>("test3", 500));
    }
}

answered Dec 11, 2014 at 2:36

Grant Winney

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1 Comment

keelerjr12 Over a year ago

I'm an idiot... Didn't even catch that. Thanks, works perfectly!

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