CODEWITHSUNDEEP
c#asp.net-core-mvc
Vlad Radu
Vlad Radu

Reputation: 131

How to display errors that are not related to validating form fields?

If I would need to display errors related to form fields, I would use the tag helpers in View:

<span asp-validation-for="SomeField"></span>

and either use data validation attributes in the model class or call 

ModelState.AddModelError("SomeField", "Error message");

in controller.

Now I need to display an error message in the Login page if login fails. Something general like "Invalid login attempt." Is there an inbuilt mechanism for that?

Adding a new unused property in a model so I can use "asp-validation-for" tag helper and AddModelError feels wrong. Should I use ViewBag or ViewData or is another way?

Upvotes: 0

Views: 201

Answers (1)

Vlad Radu
Vlad Radu

Reputation: 131

Just found how to do it.

Add a new div using asp-validation-summary tag helper in the view.


<div asp-validation-summary="ModelOnly" class="text-warning"></div>

And in controller action generate an error using an empty string:


ModelState.AddModelError(string.Empty, "Invalid login attempt");

Upvotes: 1

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