How to group consecutive similar items of a collection?

Question

Consider the following collection.

• True
• False
• False
• False
• True
• True
• False
• False

I

Answer 1

public class GroupConsecutiveEqualItemsConverter : IValueConverter
{
    static readonly object UnsetValue = new object();

    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        IEnumerable source = value as IEnumerable;
        if (source == null) return DependencyProperty.UnsetValue;
        string propertyName = parameter as string;
        var result = new ObservableCollection>();

        var notify = value as INotifyCollectionChanged;
        if (notify != null) notify.CollectionChanged += delegate { Reload(result, source, propertyName); };

        Reload(result, source, propertyName);
        return result;
    }

    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
    {
        throw new NotSupportedException();
    }

    void Reload(ObservableCollection> result, IEnumerable source, string propertyName)
    {
        result.Clear();
        object previous = UnsetValue;
        List