how to Set the entered values after refreshing the page in Asp.net core

Question

I want to show a warning that this year and season is available in the database when the repeated year and season is selected to enter information.But after showing this warning, because the page is refreshed, all the information entered in the inputs will be deleted.I want this information in the inputs not to be deleted and the user to choose another year and season



    
        نام پروژه : @ViewBag.proName

        
            سال
            
        

        
            فصل
            
        


    
    

    

        
            @{ var count = 0;}

            @for (var i = 0; i < Model.Count(); i++)

            {
                
                count++;
            }



        
            

                

                    جزئیات
                    نام فروشنده

         
                    مبلغ خرید انجام شده



                

            

                    
                        


                    
                    @Model.ToList()[i].NameFroshande  @Model.ToList()[i].FamilyOrCoumpanyFroshande

//------------------------------------------------------------------------------------------

    public IActionResult SabtKhareedView(int id)
    {
        var pro = _context.Projects.Find(id);
        ViewBag.proName = pro.projectName;
        ViewBag.proID = pro.projectID;
        var list = _context.TaminKoonande.Where(a => a.ProjectID == id && a.VazyatTaminKoonande == 1).ToList();

        return View(list);
    }

    [HttpPost]
    public IActionResult SabtKhareed(IEnumerable khareed, int ProjectId, String Yare, String FaslName, int id)
    {
        var random = Convert.ToInt32(PublicClass.RandomClass.RandomString(6));
        var mainkareed = _context.MainKhareed.Where(a => a.ProjectId == ProjectId && a.Fasle == FaslName && a.Year == Yare).FirstOrDefault();

        if (mainkareed == null)
        {

            for (var i = 0; i < khareed.Count(); i++)
            {
                var taminName = _context.TaminKoonande.Find(khareed.ToList()[i].TaminKoonandeID);

                Khareed khareed1 = new Khareed();

                khareed1.MablaghKhreedAnjamShode = khareed.ToList()[i].MablaghKhreedAnjamShode;

                khareed1.ProjectId = khareed.ToList()[i].ProjectId;
                khareed1.Year = Yare;
         
                khareed1.Fasle = FaslName;
                khareed1.TaminKoonandeID = khareed.ToList()[i].TaminKoonandeID;
                khareed1.TaminKoonandeName = taminName.NameFroshande + " " + taminName.FamilyOrCoumpanyFroshande;
                khareed1.NoaeMooamele = "ریالی";

                _context.Khareed.Add(khareed1);
                _context.SaveChanges();

            }




            return RedirectToAction("KhareedListView", new { id });

        }

        TempData["Error"] = 1;

        return RedirectToAction("SabtKhareedView", new { id });
    }

Ünlü · Answer

I recommend using Try-Catch. If you write your codes between Try-Catch, the page will not be reset unless the request is completed.

try
{
    code here...
}
catch (Exception ex)
{

Tiny Wang · Answer

Keep the table content existed, then per my knowledge, using ajax here would be a better solution.

Firstly, removing the asp-controller="Home" asp-action="subData" method="post" and type="submit" in the form element. Then we can add id for tbody and button. Adding click event handler and modify the controller api:

@section Scripts{
    
}

//[HttpPost]
//public IActionResult subData(String Yare, String FaslName) {
//    return RedirectToAction("Privacy", new { Yare, FaslName });
//}

[HttpPost]
public string subData(String Yare, String FaslName)
{
      return "error";
}

============================================

In my humble opinion, what you want is that, users select an option in the selector, then submit the searching, and after returning the response, the selector can keep the option still selector. So here's my sample. When go back to the view, bring the selected option value and using js code to set the selected option.


    
        سال
        
    
    
        فصل
        
    
    
        
    
    option1 : @ViewBag.option1
    option2 : @ViewBag.option2


@section Scripts{
    
}

public IActionResult Privacy(String Yare, String FaslName)
{
    ViewBag.option1 = Yare;
    ViewBag.option2 = FaslName;
    return View();
}

[HttpPost]
public IActionResult subData(String Yare, String FaslName) {
    return RedirectToAction("Privacy", new { Yare, FaslName });
}

how to Set the entered values after refreshing the page in Asp.net core

2 Answers