首先解释一下ActionResult与IActionResult

ActionResult一般用来返回ViewResult，PartialViewResult，JsonResult

IActionResult一般用来返回预定义响应和错误,比如404

MVC里面如果直接将数据返回到前端页面，我们常用的方式就是用return view()；

那么我不想直接用razor语法，毕竟razor这玩意儿实在是太难记了，还不如写ajax对接来得舒服不是

那么我们可以这么做

1.定义ActionResult,返回json，标记属性可以采用HttpPost,也可以是用HttpGet，按自己的需求来使用

public ActionResult UpdateDownloadInJson(string deviceNames,string programNames)
        {
            string[] deviceName = deviceNames.Split(',');
            string[] programName = programNames.Split(',');
            List<DownloadViewModel> DownloadViewModelList = new List<DownloadViewModel>();
            foreach (string tempDeviceName in deviceName)
            {
                var _deviceId=deviceInfoService.FindSingle<DeviceInfo>(r => r.DeviceName == tempDeviceName).Id;
                foreach (string tempProgramName in programName)
                {
                    int _programId = publishDetailService.Set<ProgramInfo>().Where(r => r.ProgramName == tempProgramName).FirstOrDefault().Id;
                    var progress= publishDetailService.Set<DeviceMaterial>().Where(r => r.DeviceId == _deviceId && r.ProgramId == _programId).FirstOrDefault().DownProgress;
                    DownloadViewModelList.Add(new DownloadViewModel
                    {
                        DeviceId= (int)_deviceId,
                        DeviceName = tempDeviceName,
                        ProgramName = tempProgramName,
                        DownloadProgress = (int)progress
                    });
                }
            }
            return Json(new AjaxResult
            {
                Result = DoResult.Success,
                RetValue = DownloadViewModelList
            }, JsonRequestBehavior.AllowGet);
        }

2.采用JsonResult，最主要拿来处理ajax请求

[HttpPost]
        [HandlerAjaxOnly]
        public JsonResult CheckLogin(string username, string password, string code)
        {
            UserManage.LoginResult result = this.HttpContext.UserLogin(username, password, code);
            if (result == UserManage.LoginResult.Success)
            {
                return Json(new AjaxResult { Result = DoResult.Success, DubugMessage = "登陆成功。" });
            }
            else
            {
                return Json(new AjaxResult { Result = DoResult.Faild, DubugMessage = "登陆失败，" + result.ToString() });
            }
        }

具体的区别后续补充，用法基本就是这样。

PS:

补充部分：

IActionResult的具体使用

在具体定义时,可以看到,返回的结果是不一样的,这里可以返回预定义的响应,及一些错误

 

public IActionResult Update(string id, Movie imovie)
{
var imovie = _movieService.Get(id);
if (imovie== null)
{
return NotFound();
}
_movieService.Update(id, imovie);
return NoContent();
}