/// <summary>
/// Returns a collection containing this element and all descendant elements.
/// </summary>
public static IEnumerable <ILinqToTree <T> > DescendantsAndSelf <T>(this ILinqToTree <T> adapter)
{
yield return(adapter);
foreach (var child in adapter.Descendants())
{
yield return(child);
}
}
/// <summary>
/// Returns a collection of descendant elements.
/// </summary>
public static IEnumerable <ILinqToTree <T> > Descendants <T, K>(this ILinqToTree <T> adapter)
{
return(adapter.Descendants().Where(i => i.Item is K));
}