ASP NET MVC Html ValidationSummary true does not display model errors

Question

I have some problem with Html ValidationSummary  I don t want to display property errors in ValidationSummary  And when I set Html ValidationSummary true  it does not display error messages from ModelState  When there is some Exception in controller action on string  MembersManager RegisterMember member     catch section adds an error to the ModelState   ModelState AddModelError  error   ex Message     But ValidationSummary does not display this error message  When I set Html ValidationSummary false  all messages are displaying  but I don t want to display property errors  How can I fix this problem   Here is the code I m using   Model   public class Member            Required ErrorMessage                  DisplayName  Login             public string Login   get  set              Required ErrorMessage                  DataType DataType Password            DisplayName  Password             public string Password   get  set              Required ErrorMessage                  DataType DataType Password            DisplayName  Confirm Password             public string ConfirmPassword   get  set        Controller    HttpPost  public ActionResult Register Member member        try               if   ModelState IsValid              return View             MembersManager RegisterMember member             catch  Exception ex                ModelState AddModelError  error   ex Message            return View member             View    lt   using  Html BeginForm  Register    Members   FormMethod Post                           new   enctype    multipart form-data         gt        lt p gt           lt    Html LabelFor model   gt  model Login   gt           lt    Html TextBoxFor model   gt  model Login   gt           lt    Html ValidationMessageFor model   gt  model Login   gt       lt  p gt        lt p gt           lt    Html LabelFor model   gt  model Password   gt           lt    Html PasswordFor model   gt  model Password   gt           lt    Html ValidationMessageFor model   gt  model Password   gt       lt  p gt        lt p gt           lt    Html LabelFor model   gt  model ConfirmPassword   gt           lt    Html PasswordFor model   gt  model ConfirmPassword   gt           lt    Html ValidationMessageFor model   gt  model ConfirmPassword   gt       lt  p gt        lt div gt           lt input type  submit  value  Create    gt       lt  div gt        lt    Html ValidationSummary true   gt   lt       gt

User · Accepted Answer

I believe the way the ValidationSummary flag works is it will only display ModelErrors for string empty as the key  Otherwise it is assumed it is a property error  The custom error you re adding has the key  error  so it will not display in when you call ValidationSummary true   You need to add your custom error message with an empty key like this   ModelState AddModelError string Empty  ex Message

User · Answer

Maybe like that    HttpPost  public ActionResult Register Member member        try              if   ModelState IsValid                     ModelState AddModelError  keyName    Form is not valid              return View                    MembersManager RegisterMember member             catch  Exception ex               ModelState AddModelError  keyName   ex Message          return View member             And in display add    lt div class  alert alert-danger  gt     Html ValidationMessage  keyName    lt  div gt    OR   lt div class  alert alert-danger  gt     Html ValidationSummary false   lt  div gt

User · Answer

This works better  as you can show validationMessage for a specified key       ModelState AddModelError  keyName   Message      and display it like this        Html ValidationMessage  keyName

User · Answer

I know this is kind of old and has been marked as answers with 147 up votes  but there is something else to consider    You can have all the model errors  the property named and string Empty keys alike  be shown in the ValidationSummary if you need to  There is an overload in the ValidationSummary that will do this            excludePropertyErrors           true to have the summary display model-level errors only  or false to have          the summary display all errors      public static MvcHtmlString ValidationSummary this HtmlHelper htmlHelper  bool excludePropertyErrors

User · Answer

You can try    lt div asp-validation-summary  All  class  text-danger  gt  lt  div gt

User · Answer

Html ValidationSummary false     new    class    text-danger       Using this line may be helpful

User · Answer

If nearly everything seems right  another thing to look out for is to ensure that the validation summary is not being explicitly hidden via some CSS override like this    validation-summary-valid       display  none      This may also cause the  Html ValidationSummary to appear hidden  as the summary is dynamically rendered with the validation-summary-valid class

User · Answer

In my case it was not working because of the return   Instead of using   return RedirectToAction  Rescue    CarteiraEtapaInvestimento   new   id   investimento Id  idCarteiraEtapaResgate   etapaDoResgate Id       I used   return View  ViewRescueCarteiraEtapaInvestimento   new CarteiraEtapaInvestimentoRescueViewModel   Investimento   investimento  ValorResgate   investimentoViewModel ValorResgate       It  s a Model  so it is obvius that ModelState AddModelError  keyName   Message    must work with a model   This answer show why  Adding validation with DataAnnotations

User · Answer

ADD it in the lowermost part og your View       section Scripts          Scripts Render    bundles jqueryval

[asp.net-mvc] ASP.NET MVC Html.ValidationSummary(true) does not display model errors

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