Динамический выбор шаблона при изменении данных

public class ListRssItemPresenter : DataTemplateSelector
{
    public DataTemplate TemplateUnread { get; set; }
    public DataTemplate TemplateOther { get; set; }
 
    protected override DataTemplate SelectTemplateCore(object item, DependencyObject container)
    {
        RssItem rssItem = item as RssItem;
        if (rssItem.Unread)
        {
            return TemplateUnread;
        }
        else
        {
            return TemplateOther;
        }
    }
}

RaisePropertyChanged("Unread");

public ObservableCollection<RssItem> RssList { get; set; }

protected override void OnNavigatedTo(NavigationEventArgs e)
{
    Received = e.Parameter as RssListViewModel;
    DataContext = Received.CurrentItem;
    LoadWeb();
}

public async void LoadWeb()
{
    try
    {
        HttpClient loader = new HttpClient();
        RssBody.NavigateToString(await loader.GetStringAsync(Received.CurrentItem.Link));
        Received.CurrentItem.Unread = false;
        Received.Unread--;
    }
    catch (HttpRequestException)
    {
        Received.CurrentItem.Unread = true;
        string information = "Some problem with network.";
        if (!NetworkInterface.GetIsNetworkAvailable())
        {
            information = "There is not any network connection.";
        }
        ErrorMessage(information);
    }
}

[DataContract]
public class RssItem : ChangeableProperty, IEquatable<RssItem>
{
 
    private string _title;
    private string _published;
    private string _description;
    private string _link;
    private bool _unread;
 
    [DataMember]
    public string Title
    {
        get
        {
            return _title;
        }
 
        set
        {
            _title = value;
            RaisePropertyChanged("Title");
        }
    }
    [DataMember]
    public string Published
    {
        get
        {
            return _published;
        }
        set
        {
            _published = value;
            RaisePropertyChanged("Published");
        }
    }
    [DataMember]
    public string Description
    {
        get
        {
            return _description;
        }
        set
        {
            _description = value;
            RaisePropertyChanged("Description");
        }
    }
    [DataMember]
    public string Link
    {
        get
        {
            return _link;
        }
       set
       {
            _link = value;
            RaisePropertyChanged("Link");
        }
    }
    [DataMember]
    public bool Unread
    {
        get
        {
            return _unread;
        }
        set
        {
            _unread = value;
            RaisePropertyChanged("Unread");
        }
    }
 
    public RssItem(string title, string link, string description, string published)
    {
        this._title = title;
        this._link = link;
        this._description = description;
        this._published = published;
        this._unread = true;
    }
 
    public bool Equals(RssItem other)
    {
        if ((this._title == other._title) && (this._published == other._published) && (this._link == other._link) && (this._description == other._description))
        {
            return true;
        }
        else
        {
            return false;
        }
    }
}

public class ChangeableProperty : INotifyPropertyChanged
{
    public event PropertyChangedEventHandler PropertyChanged;
 
    public void RaisePropertyChanged(string propertyName)
    {
        if (this.PropertyChanged != null)
        {
            this.PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
        }
    }
}