public TF FirstOrDefault <TF>(Func <TF, bool> predicate)
{
var inner = Transformed.OfType <TF>().FirstOrDefault(predicate);
if (inner != null)
{
return(inner);
}
return(_extendedSet.FirstOrDefault(predicate));
}
public IEnumerable <TO> OfType <TO>()
{
return(_extendedSet.OfType <TO>().Concat(Transformed.OfType <TO>()));
}
public IEnumerable <TW> Where <TW>(Func <TW, bool> predicate)
{
return(Transformed.OfType <TW>().Where(predicate).Concat(_extendedSet.Where(predicate)));
}