Modelstate.isvalid why

In this case, we set it to LastName. You could also set it to nothing or a fake name if you just want it to appear in the ValidationSummary and not in a ValidationMessage. The validation process respects the attributes like [Required] and [EmailAddress] , and we can add custom errors to the validation if we so desire. Don't forget, I've got a very simple sample project on Github that demonstrates how the ModelState works and provides all the code and markup in this post.

Also, if this post helped you, please consider buying me a coffee. Your support funds all of my projects and helps me keep traditional ads off this site. Awwww, it's adorable! But that's the boring explanation.

Show me the code! GitHub exceptionnotfound. Did you like this post? Share it! The link has been copied! Get the best. Haroen Viaene 1, 16 16 silver badges 28 28 bronze badges. Notice that error can be Message or Exception; for example Html. ValidationSummary does not display exceptions for security reasons I guess ; maybe that's why you don't see errors? How do you check for no errors? IsValid gives false — Omu. Ha-ha, that's obvious Michael G Michael G 6, 1 1 gold badge 40 40 silver badges 59 59 bronze badges.

The modelstate will have a key "Property" and an associated error in the dictionary. Because the ModelStateDictionary. AddModelError method takes a key, and Exception or error String; it's required to add a model error. You can retrieve the exception with the following snippet to find out whats wrong: Often if the binder is trying to convert strings to complex types etc if!

Jonas Stensved Jonas Stensved This code was very helpful to me, but iterating the errors Exceptions to get each. Message resulted in "object reference not set to an instance of an object".

When I changed z. Exception to z. ErrorMessage I was able to display the error messages. This was the solution for me, changing to z. ErrorMessage, although I didn't get an error with z. Exception, just null values. Probably worth updating the original answer.

Really helpful tip. Net MVC which verifies two things: 1. Whether the Form values are bound to the Model. All the validations specified inside Model class using Data annotations have been passed. IsValid property can be used to perform some logical operations based on the values submitted by the User. In this article I will explain with an example, how to use ModelState.

Net MVC which verifies two things:. The following Model class consists of one property Name to which the Required Data Annotation attribute has been applied. As per MSDN, the. As the name suggests, this string value will be displayed to the user when the validation fails.

The Controller consists of two Action methods. Action method for handling GET operation. Inside this Action method, simply the View is returned. Action method for handling POST operation. This action method handles the POST operation and when the form is submitted, the object of the PersonModel class is sent to this method. The state of the submitted Model is checked using ModelState.

Search related threads. Remove From My Forums. Answered by:. Archived Forums. Sign in to vote. User posted In action method Send at the bottom of this post I have an example of ModelState. Tuesday, July 1, AM. User posted Now to my question when will ModelState. User posted The ModelState. AddModelError "","One or more errors occurred.

User posted ModelState. User posted So basically I still mean that the reason to have ModelState.