Demo usage of ToContentSet()

ContentSet.cshtml

// IPublishedContent implements IsFirst, IsOdd, Index and various stuff
// so technically it's possible to do
@foreach(var content in contents)
{
  <div class="@(content.IsFirst() ? "first" : "") @(content.IsOdd() ? "odd" : "even")" id="item-@(content.Index())">
    @content.Name
  </div>
}

// however, because of some issues in IPublishedContent, IsFirst, IsOdd, Index... all
// gave random results as soon as contents was not the origin children collection.
// this has been fixed but requires the usage of the .ToContentSet() method:

var contents = Model
  .Children()
  .Where(x => x.GetPropertyValue<int>("whatever") > 10)
  .OrderBy(x => x.Name)
  .ToContentSet();