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I am trying to get the PublishingRollupImage of a list item using the server object model (requirement) in a sandbox solution. The problem I have is that I can't reference the Microsoft.SharePoint.Publishing assembly required for ImageFieldValue

This is how I would do it with a farm solution

foreach (SPListItem item in listItems)
{
 bannerImages.Add(new BannerImage
 {
  Title = Convert.ToString(item[SPBuiltInFieldId.Title]),
  Subtitle = Convert.ToString(item["Subtitle"]),
  RollupImage = ((ImageFieldValue)(item["PublishingRollupImage"])).ImageUrl,
  Link = Convert.ToString(item["Link"]),
 });
}

but if I try to activate it as a sandbox solution I get an error saying that I can't include a reference to the DLL mentioned above

How would I go about getting the URL of the image without using ImageFieldValue? It would be hosted in Office365 so can't change any web.config or write custom CAS etc.

Edit: it's SharePoint 2013.

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