Question

I have a class as follows

public partial class Configuration : INotifyPropertyChanged
{
    private bool _isToolTips;
    public bool IsToolTips
    {
        get { return _isToolTips; }
        set { Set(this, "IsToolTips", ref _isToolTips, value, PropertyChanged); }
    }

    #region INotifyPropertyChanged functionality

    public static void Set<T>(object owner, string propName, ref T oldValue, T newValue,
        PropertyChangedEventHandler eventHandler)
    {
        // make sure the property name really exists
        if (owner.GetType().GetProperty(propName) == null)
        {
            throw new ArgumentException("No property named ‘" +
                propName + "‘ on " + owner.GetType().FullName);
        }

        // we only raise an event if the value has changed
        if (Equals(oldValue, newValue)) return;
        oldValue = newValue;
        if (eventHandler != null)
        {
            eventHandler(owner, new PropertyChangedEventArgs(propName));
        }
    }
    public event PropertyChangedEventHandler PropertyChanged;
    private void notifyPropertyChanged(String info)
    {
        if (PropertyChanged != null)
        {
            PropertyChanged(this, new PropertyChangedEventArgs(info));
        }
    }

    #endregion INotifyPropertyChanged functionality
}

This class is compiled in a separate assembly. I then add it to my MainWindow constructor as follows [edit]

    public MainWindow()
    {
        initializeAttributes();
        InitializeComponent();
        CurrentConfig = new Configuration
        {
            IsToolTips = true
        };
        DataContext = CurrentConfig;
        composeModules();
    }

[end edit]
and in my XMAL I have this [edit]

<MenuItem Name="ToolTips"
    Header="Tool Tips"
    IsCheckable="True"
    IsChecked="{Binding Source=CurrentConfig,
                        Path=IsToolTips,
                        Mode=TwoWay}"
    Click="onToolTipsClick">
</MenuItem>

[end edit]
The problem is that the “PropertyChanged” member of my Configuration class is always set to null. Where am I going wrong?

Answer 1

Source=CurrentConfiguration sets the Source to the string "CurrentConfiguration", which obviously won’t have that property.

Debug your binding and see the references if you don’t know enough about them.