Sitecore XslHelper GetItem()

I am using the XslHelper from some C# code. I use the GetItem() function to get an item from a NodePathIterator.
But the GetItem() generates an error “SystemInvalidOperationException: Enumeration has not started. Call MoveNext()“. The following code will fail with that error:

public static string GetDisplayName(System.Xml.XPath.XPathNodeIterator iterator)
{
  Sitecore.Xml.Xsl.XslHelper helper = new Sitecore.Xml.Xsl.XslHelper();
  Item item = helper.GetItem(iterator);
  if (item.DisplayName != String.Empty)
    return item.DisplayName;
  return item.Name;
}

The solution is to call f.ex. the fld() function before GetItem. This will work:

public static string GetDisplayName(System.Xml.XPath.XPathNodeIterator iterator)
{
  Sitecore.Xml.Xsl.XslHelper helper = new Sitecore.Xml.Xsl.XslHelper();
  // Call fld(".") to aviod the Enumeration has not started error.
  helper.fld(".", iterator);
  Item item = helper.GetItem(iterator);
  if (item.DisplayName != String.Empty)
    return item.DisplayName;
  return item.Name;
}

Sitecore support suggested another fix, which I haven’t tried yet:

public static string GetDisplayName(System.Xml.XPath.XPathNodeIterator iterator)
{
  Item item = null;
  if (iterator.MoveNext())
  {
    string ID = iterator.Current.GetAttribute("id", string.Empty);
    if (ID != string.Empty)
    {
      item = Context.Database.Items[ID];
      if (item.DisplayName == String.Empty)
        item.Name;
    }
  }
  return item.DisplayName;
}

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