public void TopShow(TopShow entity)
 {
     if (!IsExist(entity))
     {
         using (var content = new FxAggregateContext())
         {
             content.TopShows.Add(entity);
             content.SaveChanges();
         }
     }
 }
 /// <summary>
 /// 取消置顶
 /// </summary>
 /// <param name="entity"></param>
 public void TopShowCancel(TopShow entity)
 {
     if (IsExist(entity))
     {
         using (var content = new FxAggregateContext())
         {
             entity = content.TopShows
             .Where(r => r.TopShowId == entity.TopShowId)
             .FirstOrDefault();
             if (entity != null)
             {
                 content.TopShows.Remove(entity);
                 content.SaveChanges();
             }
         }
     }
 }
 public bool IsExist(TopShow entity)
 {
     return GetById(entity.TopShowId) != null;
 }