int columnId = (int)ViewBag.ColumnId;//当前栏目id
int siteId = (int)ViewBag.SiteId;//当前站点id
IEnumerable<dynamic> ColumnList = Html.GetColumnList(c => c.Show == 1 && c.SiteId == siteId);
dynamic topParentData = Html.GetTopParentData(ColumnList, columnId);//获取当前栏目的父级ids
int parentId = topParentData.Id;
string thumbnail = Html.GetColumnContentSet(parentId).Thumbnail;
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