asp.net core - Validation Messages not showing on login page -

i have controller called account controller houses login function. problem having going straight index page instead of displaying model error invalid login.

in aps.net web forms used validation group , validationsummary same required here

[httppost] public async task<iactionresult> login(string email, string password, bool rememberme) {         var user = await _usermanager.findbyemailasync(email);         if (user == null)         {             modelstate.addmodelerror(string.empty, "invalid login");             return view();         }         if (!user.emailconfirmed)         {             modelstate.addmodelerror(string.empty, "confirm email first");             return view();         }          var passwordsigninresult = await _signinmanager.passwordsigninasync(user, password, ispersistent: rememberme, lockoutonfailure: false);            if (!passwordsigninresult.succeeded)         {             await _usermanager.accessfailedasync(user);             modelstate.addmodelerror(string.empty, "invalid login");             return view();         }          return redirect("~/");     } 

login page

<form asp-controller="account" asp-action="login" method="post">      <div class="form-group has-feedback">         <input type="email" class="form-control" name="email" id="email" placeholder="email">         <span class="glyphicon glyphicon-envelope form-control-feedback"></span>     </div>     <div class="form-group has-feedback">         <input type="password" class="form-control" name="password" id="password" placeholder="password">         <span class="glyphicon glyphicon-lock form-control-feedback"></span>     </div>     <div class="row">         <div class="col-xs-8">             <div class="checkbox icheck">                 <label>                     <input type="checkbox" name="rememberme" value="true"> remember me                     <input type="hidden" name="rememberme" value="false" />                  </label>             </div>         </div>         <!-- /.col -->         <div class="col-xs-4">             <button type="submit" class="btn btn-primary btn-block btn-flat">sign in</button>         </div>         <!-- /.col -->     </div>     </form>  

my startup.cs configure in case missing.

 // method gets called runtime. use method configure http request pipeline.     public void configure(iapplicationbuilder app, ihostingenvironment env, iloggerfactory loggerfactory)     {         loggerfactory.addconsole(configuration.getsection("logging"));         loggerfactory.adddebug();         if (env.isdevelopment())         {             app.usedeveloperexceptionpage();                         }         else         {             app.useexceptionhandler("/home/error");         }          app.usestaticfiles();         app.useidentity();         app.usemvc(routes =>         {             routes.maproute(                 name: "default",                 template: "{controller=home}/{action=index}/{id?}");         });       } 

tried code , works fine , shows index page when no errors added modelstate.

validationsummary still present in asp.net core can use below.

<form asp-controller="account" asp-action="login" method="post">      <div asp-validation-summary="modelonly" class="text-danger"></div>     <div class="form-group has-feedback">             <input type="email" class="form-control" name="email" id="email" placeholder="email">         <span class="glyphicon glyphicon-envelope form-control-feedback"></span>     </div>     ...     </form> 

when used code, errors displayed on page without issues.

but suggestion can improve code bit , instead of many return view(); in code use code in end of method before return redirect("~/")

    if (!modelstate.isvalid)         return view(); 

update: there full code of login method.

[httppost] public async task<iactionresult> login(string email, string password, bool rememberme) {     identityuser user = await _usermanager.findbyemailasync(email);     if (user == null)     {         modelstate.addmodelerror(string.empty, "invalid login");         return view();//this should kept because if user null, passwordsigninasync generate exception     }     if (!user.emailconfirmed)     {         modelstate.addmodelerror(string.empty, "confirm email first");     }      var passwordsigninresult = await _signinmanager.passwordsigninasync(user, password, ispersistent: rememberme, lockoutonfailure: false);      if (!passwordsigninresult.succeeded)     {         await _usermanager.accessfailedasync(user);         modelstate.addmodelerror(string.empty, "invalid login");     }      if (!modelstate.isvalid)         return view();      return redirect("~/"); } 

update2: easiest way, in opinion, handle empty emails in case using required attribute in view email field below.

<input required type="email" class="form-control" name="email" id="email" placeholder="email"> 

this required attribute specifies user must fill in value before submitting form, without entering value email not able submit form, therefore not exception. can read more required attribute here , plus link form validation(see required attribute section).