Wiki

/// <summary>
/// connect to list as systemaccount, and return all items
/// </summary>
/// <param name="list"></param>
/// <returns></returns>
public static SPListItemCollection GetItemsWithElevatedPermissions(this SPList list)
{
    using (var site = new SPSite(list.ParentWebUrl, SPContext.Current.Site.SystemAccount.UserToken))
    using (var web = site.OpenWeb())
    {
        SPList elevatedList = web.Lists.GetList(list.ID, true);
        return elevatedList.Items;
    }
}