public async Task <IActionResult> Content(int campaignid, string order, int pageindex = 1, int pagesize = 20)
        {
            var campaign = await _campaignService.GetCampaign(campaignid);

            if (campaign == null)
            {
                return(NotFound());
            }
            ViewBag.Campaign = campaign;
            var model = await _campaignAccountContentService.GetGroupCampaignAccountContentsByCampaignId(campaign.Id, order, pageindex, pagesize);

            ViewBag.CampaignId = campaign.Id;
            return(View(model));
        }