I'm new to C# and I keep getting the errors below which I can't remove.
System.Windows.Data Error: 4 : Cannot find source for binding with reference 'RelativeSource FindAncestor, AncestorType='System.Windows.Controls.ItemsControl', AncestorLevel='1''. BindingExpression:Path=HorizontalContentAlignment; DataItem=null; target element is 'RibbonGalleryItem' (Name=''); target property is 'HorizontalContentAlignment' (type 'HorizontalAlignment')
System.Windows.Data Error: 4 : Cannot find source for binding with reference 'RelativeSource FindAncestor, AncestorType='System.Windows.Controls.ItemsControl', AncestorLevel='1''. BindingExpression:Path=VerticalContentAlignment; DataItem=null; target element is 'RibbonGalleryItem' (Name=''); target property is 'VerticalContentAlignment' (type 'VerticalAlignment')
My code is below and I can't tell exactly which line is causing the error but I suspect it's related to the RibbonRadioButtons as, if I remove them, I don't get errors. The errors only appear after clicking on two or more radio buttons. An answer at ComboBoxItem continues to throw binding error despite style suggested it was multiple Refresh() statements causing the problem but I can't see how to avoid this.
Can anyone help me resolve this issue?
XAML
<Grid>
<DockPanel>
<r:Ribbon DockPanel.Dock="Top" x:Name="Ribbon" SelectedIndex="0">
<r:RibbonGroup Header="Continent" Width="Auto">
<r:RibbonComboBox x:Name="CountryList" Height="Auto" VerticalAlignment="Center" HorizontalContentAlignment="Left">
<r:RibbonGallery x:Name="cbSelectedCountry" SelectedValue="{Binding SelectedCountry, Mode=TwoWay}" SelectedValuePath="DisplayName" >
<r:RibbonGalleryCategory x:Name="cbCountryList" ItemsSource="{Binding CountryView}" DisplayMemberPath="DisplayName" />
</r:RibbonGallery>
</r:RibbonComboBox>
<WrapPanel>
<r:RibbonRadioButton x:Name="All" Label="All" GroupName="ContinentGroup"
Height="Auto" Width="Auto" HorizontalAlignment="Left"
IsChecked="{Binding Path=All}">
</r:RibbonRadioButton>
<r:RibbonRadioButton x:Name="Africa" Label="Africa" GroupName="ContinentGroup"
Height="Auto" Width="Auto" HorizontalAlignment="Left"
IsChecked="{Binding Path=Africa}">
</r:RibbonRadioButton>
<r:RibbonRadioButton x:Name="America" Label="America" GroupName="ContinentGroup"
Height="Auto" Width="Auto" HorizontalAlignment="Left"
IsChecked="{Binding Path=America}">
</r:RibbonRadioButton>
</WrapPanel>
</r:RibbonGroup>
</r:Ribbon>
</DockPanel>
</Grid>
C#
public class MySettings : INotifyPropertyChanged
{
private readonly ObservableCollection<Country> countries;
private ContinentViewModel selectedContinent;
private static string selectedCountry;
private int selectedRadioGroup;
private ObservableCollection<ContinentViewModel> continents;
private ListCollectionView countryView;
public event PropertyChangedEventHandler PropertyChanged;
private bool _All;
private bool _Africa;
private bool _America;
public MySettings()
{
countries = new ObservableCollection<Country>(
new[]
{
new Country() { Continent = Continent.Africa, DisplayName = "Algeria" },
new Country() { Continent = Continent.Africa, DisplayName = "Egypt" },
new Country() { Continent = Continent.Africa, DisplayName = "Chad" },
new Country() { Continent = Continent.Africa, DisplayName = "Ghana" },
new Country() { Continent = Continent.America, DisplayName = "Canada" },
new Country() { Continent = Continent.America, DisplayName = "Greenland" },
new Country() { Continent = Continent.America, DisplayName = "Haiti" }
});
CountryView = (ListCollectionView)CollectionViewSource.GetDefaultView(countries);
CountryView.Filter += CountryFilter;
Continents = new ObservableCollection<ContinentViewModel>(Enum.GetValues(typeof(Continent)).Cast<Continent>().Select(c => new ContinentViewModel { Model = c }));
}
public bool All
{
get => _All;
set
{
_All = value;
CountryView.Refresh();
SelectedCountry = _All ? countries.FirstOrDefault().DisplayName : SelectedCountry;
OnPropertyChanged("All");
}
}
public bool Africa
{
get => _Africa;
set
{
_Africa = value;
CountryView.Refresh();
SelectedCountry = _Africa ? countries.Where(_ => _.Continent == Continent.Africa).FirstOrDefault().DisplayName : SelectedCountry;
OnPropertyChanged("Africa");
}
}
public bool America
{
get => _America;
set
{
_America = value;
CountryView.Refresh();
SelectedCountry = _America ? countries.Where(_ => _.Continent == Continent.America).FirstOrDefault().DisplayName : SelectedCountry;
OnPropertyChanged("America");
}
}
private bool CountryFilter(object obj)
{
var country = obj as Country;
if (country == null) return false;
if (All && !Africa && !America) return true;
else if (!All && Africa && !America) return country.Continent == Continent.Africa;
else if (!All && !Africa && America) return country.Continent == Continent.America;
return true;
}
public ObservableCollection<ContinentViewModel> Continents
{
get => continents;
set
{
continents = value;
OnPropertyChanged("Continents");
}
}
public ListCollectionView CountryView
{
get => countryView;
set
{
countryView = value;
OnPropertyChanged("CountryView");
}
}
public class Country
{
public string DisplayName { get; set; }
public Continent Continent { get; set; }
}
public enum Continent
{
All,
Africa,
America
}
public class ContinentViewModel
{
public Continent Model { get; set; }
public string DisplayName => Enum.GetName(typeof(Continent), Model);
}
public ContinentViewModel SelectedContinent
{
get => selectedContinent;
set
{
selectedContinent = value;
OnContinentChanged();
this.OnPropertyChanged("SelectedContinent");
}
}
private void OnContinentChanged()
{
CountryView.Refresh();
}
public int SelectedRadioGroup
{
get => selectedRadioGroup;
set
{
selectedRadioGroup = value;
OnPropertyChanged("SelectedRadioGroup");
}
}
public string SelectedCountry
{
get => selectedCountry;
set
{
if (selectedCountry == value) return;
selectedCountry = value;
OnPropertyChanged("SelectedCountry");
}
}
protected virtual void OnPropertyChanged(string propertyName)
{
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
}
}
