將ViewBag中的消息從控制器傳遞到ASP.Net MVC中的視圖

Question

我是ASP.Net MVC的新手。 我有一個名為Index.cshtml的視圖。我在homeController有兩個動作， 'Index'和'saveAttendance' 。 首先，進行索引操作，並將“索引”操作返回的視圖中的數據發送到“saveAttendance”操作。 完成'saveAttendance'操作中的所有功能后，我需要返回查看“Index.cshtml”並在viewbag中顯示成功消息。 我沒有將視圖分配給“saveAttendance”操作。 我只需要返回查看“索引”動作。

我的homeController的代碼：

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

將saveAttenance重命名為Index以處理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();
}

並在視圖中更新表單以POST到正確的操作。

Answer 2

問題是函數“saveAttendance”的返回類型是無效的，在“ saveAttendance ”結束時你正在做RedirectToAction("Index") ，它最終調用索引ActionResult，但是當“saveAttendance”為void時你不會被重定向到Index視圖。

只需做三個小調整

1. 將public void saveAttendance(attendance_entry entryObj)更改為public ActionResult Index(attendance_entry entryObj)

2. 在saveAttendance函數結束時只需寫入Return RedirectToAction("Index"); 而不是RedirectToAction("Index");

3. 使用[ChildActionOnly]以便url不訪問saveAttendance

這是代碼

[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";
            }

        }`