未在PartialView中显示Modelstate.addmodelerror

Question

addmodelerror isworking fr views but not in partial views.

My Code: Partial view "_login" which is called in view Login.cshtml :

@model MODEL.Identity.LoginViewModel

@using (Ajax.BeginForm("Login", "MyAccount", new AjaxOptions { HttpMethod = "POST"}, new { role = "form" }))
{

   @Html.AntiForgeryToken()
        <div class="main-container">
            @Html.ValidationSummary(true, "", new { @class = "text-danger" })


        <div class="container">............

The error messages of email and password are displayed but not for my ModelState.AddModelError("", "Nom d'utilisateur ou mot de passe non valide."); Code in Action:

 [HttpPost]
    [AllowAnonymous]
    [ValidateAntiForgeryToken]
    public async Task<ActionResult> Login(LoginViewModel model, string returnUrl)
    {
        if (ModelState.IsValid)
        {

            ApplicationDbContext context = new ApplicationDbContext();              
            var u = await UserManager.FindByEmailAsync(model.Email);
            bool passhash = false;
            if (u != null)
            {
                passhash = await UserManager.CheckPasswordAsync(u, model.Password);
            }

            if (u != null && passhash)
            {
                await SignInAsync(u, model.RememberMe);
                 return RedirectToLocal(returnUrl);
            }
            else
            {
                ModelState.AddModelError("", "Nom d'utilisateur ou mot de passe non valide.");
            }

        }

        return PartialView("~/views/MyAccount/_login.cshtml",model);

    }

Help Thanks

Answer 1

Its resolved it works but i dont know if it is good practice? this is my code

[HttpPost]
    [AllowAnonymous]
    [ValidateAntiForgeryToken]
    public async Task<string> Login(LoginViewModel model )
    {                 
            var u = await UserManager.FindByEmailAsync(model.Email);
            bool passhash = false;
            if (u != null)
            {
              passhash = await UserManager.CheckPasswordAsync(u, model.Password);
            }                
            if (u != null && passhash)
            {
              await SignInAsync(u, model.RememberMe);                 
              return ("ok");
            }
            else                
               return ("Nom d'utilisateur ou mot de passe non valide.");  
    }

and my view or partial view

    @model MODEL.Identity.LoginViewModel
<script type="text/javascript">
    function OnSuccess(response) {       
        if (response != "ok") 
        {           
            document.getElementById("errormessage").innerHTML = response
        }
        else 
        {
            window.location.href = "/Home/Index/";
        }
    }
    </script>

     @using (Ajax.BeginForm("Login", "MyAccount", new AjaxOptions { OnSuccess = "OnSuccess" }, new { @class = "form-horizontal", role = "form" }))
  {
    <div id="errormessage" class='field-validation-error text-danger' style=" display: block;"></div>
         @Html.AntiForgeryToken()
        <div class="main-container">
            @Html.ValidationSummary(true, "", new { @class = "text-danger" })

            <div class="container">............ 

If you have any other idea, post it