public JsonNetResult <string> GetArticleFieldValue(int contentId, string fieldName, int articleId) => EntityObjectService.GetArticleFieldValue(contentId, fieldName, articleId);
 public JsonResult GetArticleFieldValue(int contentId, string fieldName, int articleId)
 {
     return(Json(EntityObjectService.GetArticleFieldValue(contentId, fieldName, articleId)));
 }