将ViewBag中的消息从控制器传递到ASP.Net MVC中的视图

Question

I am new to ASP.Net MVC . I have a view named Index.cshtml .I have two actions in homeController , 'Index' and 'saveAttendance' . First, Index action takes place and the datas from view returned by 'Index' action is sent to 'saveAttendance' action. After all the functions in 'saveAttendance' action is completed I need to return to view to 'Index.cshtml' with a success message in viewbag. I don't have a view assigned to 'saveAttendance' action. I just need to return to view in 'Index' action.

My homeController's code:

public ActionResult Index()
{
    try
    {
        ViewBag.nepali_date = dc.ToBS(DateTime.Now);
    }
    catch (Exception ex)
    {
        throw ex;
    }

    return View();
}

public void saveAttendance(attendance_entry entryObj)
{
    try
    {
        DateConverter dc = new DateConverter();
        DateTime current_date = entryObj.current_date;
        string nep_date = entryObj.nep_date;
        DateTime current_time = entryObj.current_time;
        string current_day = entryObj.current_day;
        int staff_id = Convert.ToInt32(Session["staff_id"]);
        string in_time = entryObj.in_time;
        string out_time = entryObj.out_time;
       if( DAL.Attendance.Model.exists(staff_id.ToString())!=0)
        {
            ViewBag.message = "Attendance for today is already made.";
            return;
        }
        DAL.Attendance.Model.insert(nep_date, staff_id,current_date, current_time, current_day,in_time,out_time);
        ViewBag.message = "Record saved successfully";
        RedirectToAction("Index");           
    }
    catch (Exception)
    {
        ViewBag.message = "Failed to save attendance record";       
    }

}

Answer 1

Rename saveAttenance to Index to handle POST.

public ActionResult Index() {
    ViewBag.nepali_date = dc.ToBS(DateTime.Now);
    return View();
}

[HttpPost]
public ActionResult Index(attendance_entry entryObj) {
    try {
        var dc = new DateConverter();
        var current_date = entryObj.current_date;
        var nep_date = entryObj.nep_date;
        var current_time = entryObj.current_time;
        var current_day = entryObj.current_day;
        var staff_id = Convert.ToInt32(Session["staff_id"]);
        var in_time = entryObj.in_time;
        var out_time = entryObj.out_time;
        if( DAL.Attendance.Model.exists(staff_id.ToString())!=0) {
            ViewBag.message = "Attendance for today is already made.";                
        } else {
            DAL.Attendance.Model.insert(nep_date, staff_id,current_date, current_time, current_day,in_time,out_time);
            ViewBag.message = "Record saved successfully";
        }
    } catch (Exception) {
        ViewBag.message = "Failed to save attendance record";
    }

    ViewBag.nepali_date = dc.ToBS(DateTime.Now);
    return View();
}

And update the form in the view to POST to the the correct action.

Answer 2

The problem is the return type of function "saveAttendance" which is void and in the end of " saveAttendance " you are doing RedirectToAction("Index") which eventually calls the index ActionResult but as "saveAttendance" is void you wont be redirected to Index View.

Just make three small tweaks

1. Change public void saveAttendance(attendance_entry entryObj) to public ActionResult Index(attendance_entry entryObj)

2. In the end of saveAttendance function just write Return RedirectToAction("Index"); instead of RedirectToAction("Index");

3. Use [ChildActionOnly] so that saveAttendance is not accessed by url

Here is the code

[ChildActionOnly]
        public ActionResult saveAttendance(attendance_entry entryObj)
        {
            try
            {
                DateConverter dc = new DateConverter();
                DateTime current_date = entryObj.current_date;
                string nep_date = entryObj.nep_date;
                DateTime current_time = entryObj.current_time;
                string current_day = entryObj.current_day;
                int staff_id = Convert.ToInt32(Session["staff_id"]);
                string in_time = entryObj.in_time;
                string out_time = entryObj.out_time;
                if (DAL.Attendance.Model.exists(staff_id.ToString()) != 0)
                {
                    ViewBag.message = "Attendance for today is already made.";
                    return;
                }
                DAL.Attendance.Model.insert(nep_date, staff_id, current_date, current_time, current_day, in_time, out_time);
                ViewBag.message = "Record saved successfully";
                return RedirectToAction("Index");
            }
            catch (Exception)
            {
                ViewBag.message = "Failed to save attendance record";
            }

        }`