Xaml producing path errors but some still work

Question

I have a case where I get a binding path error. However, some of the bindings still work while others don't. I have the following classes (copy/pasted only the relevant bits) :

Code behind :

class RSSManager : BaseViewModel
{
    #region Resources
    private Platforms _platformsList;

    public Platforms PlatformsList
    {
        get { return _platformsList; }
        set
        {
            _platformsList = value;
            NotifyPropertyChanged("PlatformsList");
        }
    }

    private List _mainActivitiesList = new List();

    public List MainActivitiesList
    {
        get { return _mainActivitiesList; }
        set
        {
            _mainActivitiesList = value;
            NotifyPropertyChanged("MainActivitiesList");
        }
    }

    private ObservableCollection _activitiesList = new ObservableCollection();

    public ObservableCollection ActivitiesList
    {
        get { return _activitiesList; }
        set
        {
            _activitiesList = value;
            NotifyPropertyChanged("ActivitiesList");
        }
    }

    private ObservableCollection _alertsList = new ObservableCollection();

    public ObservableCollection AlertsList
    {
        get { return _alertsList; }
        set
        {
            _alertsList = value;
            NotifyPropertyChanged("AlertsList");
        }
    }

    private ObservableCollection _invasionsList = new ObservableCollection();

    public ObservableCollection InvasionsList
    {
        get { return _invasionsList; }
        set
        {
            _invasionsList = value;
            NotifyPropertyChanged("InvasionsList");
        }
    }

    private ObservableCollection _outbreaksList = new ObservableCollection();

    public ObservableCollection OutbreaksList
    {
        get { return _outbreaksList; }
        set
        {
            _outbreaksList = value;
            NotifyPropertyChanged("OutbreaksList");
        }
    }

    private ObservableCollection _doneList = new ObservableCollection();

    public ObservableCollection DoneList
    {
        get { return _doneList; }
        set
        {
            _doneList = value;
            NotifyPropertyChanged("DoneList");
        }
    }

    #endregion

}

    public partial class Activities : Page, IOptions
{
    Options.OptionsActivities _options = new Options.OptionsActivities();

    RSSManager _manager = new RSSManager();

    public Activities()
    {
        InitVars();
        InitializeComponent();
        DataContext = _manager;
        UpdateCheckBoxes();
        UpdateTabsHeaders();
    }

}

Activities.xaml :

The errors :

System.Windows.Data Error: 40 : BindingExpression path error: 'ActivitiesList' property not found on 'object' ''RelativeSource' (HashCode=16143157)'. BindingExpression:Path=ActivitiesList; DataItem='RelativeSource' (HashCode=16143157); target element is 'ListView' (Name='ListAll'); target property is 'ItemsSource' (type 'IEnumerable') System.Windows.Data Error: 40 : BindingExpression path error: 'AlertsList' property not found on 'object' ''RelativeSource' (HashCode=16143157)'. BindingExpression:Path=AlertsList; DataItem='RelativeSource' (HashCode=16143157); target element is 'ListView' (Name='ListAlerts'); target property is 'ItemsSource' (type 'IEnumerable') System.Windows.Data Error: 40 : BindingExpression path error: 'InvasionsList' property not found on 'object' ''RelativeSource' (HashCode=16143157)'. BindingExpression:Path=InvasionsList; DataItem='RelativeSource' (HashCode=16143157); target element is 'ListView' (Name='ListInvasions'); target property is 'ItemsSource' (type 'IEnumerable') System.Windows.Data Error: 40 : BindingExpression path error: 'OutbreaksList' property not found on 'object' ''RelativeSource' (HashCode=16143157)'. BindingExpression:Path=OutbreaksList; DataItem='RelativeSource' (HashCode=16143157); target element is 'ListView' (Name='ListOutbreaks'); target property is 'ItemsSource' (type 'IEnumerable') System.Windows.Data Error: 40 : BindingExpression path error: 'DoneList' property not found on 'object' ''RelativeSource' (HashCode=16143157)'. BindingExpression:Path=DoneList; DataItem='RelativeSource' (HashCode=16143157); target element is 'ListView' (Name='ListDone'); target property is 'ItemsSource' (type 'IEnumerable')

I haven't yet gotten to the part of factoring templates, but I don't think that is the issue here.

As stated, even though I get the errors, the program is showing what I want. However, the bindings I added next are not working at all with the output giving the same error types (wrong path). What am I doing wrong here?

Mike Eason · Accepted Answer

You are setting the DataContext in the XAML and also in the Constructor.

Remove the DataContext line in the XAML as this is causing the errors in the output:

DataContext="{Binding Source={RelativeSource Self}}"

In the event of binding failures, the application won't raise any errors and stop the application, but they will display them in the Output.

I find that a good way of seeing any binding errors before running the app would be to check if the intellisense is working. If it is, then you should be good to go.

Xaml producing path errors but some still work

Answers (1)

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