ASP.NET Core MVC: ModelState value

Question

I am working on an ASP.NET Core MVC project. Currently, I'm trying to add actors from Create.cshtml view. The view has three fields and all of them are required:

ProfilePictureURL
FullName
Bio

I'm making these fields required with some data annotation attributes in the model.

In the controller, I am using [Bind] data annotation in the parentheses of the respective action method. Inside of its body I'm checking !ModelState.IsValid which is expected to be false. On the contrary, it's true and I don't get it why.

Here are some screenshots of model, controller and view.

Controller:

Model:

View:

Can anyone tell me why my !IsModelState.IsValid is always true?

Thanks in advance 😊

First of all, screenshot is not accepted to let other contributor expects to resolve your issue. Please share exact code snippet in order to investigate your concern. — Md Farid Uddin Kiron
– Md Farid Uddin Kiron, Commented Dec 7, 2022 at 1:38

Md Farid Uddin Kiron · Accepted Answer · 2022-12-07 03:34:33Z

1

Inside of its body I'm checking !ModelState.IsValid which is expected to be false. On the contrary, it's true and I don't get it why.

Altough, you haven't shared your code snippet in correct way and your asp.net core version information as well. However, if you use older version than asp.net core 6 in that case you might encounter this issue. Because, in older version of asp.net core when you use DataAnnotations in that scenario the property without any annotation doesn't take into account. In your case public List<Movie> Movies { get; set; } has no DataAnnotations which would comletely be ignored in older than asp.net core 6.

Debug in asp.net core 6:

Note: As you can see in asp.net core 6 as you haven't use any DataAnnotations on Movies property therefore, by default it will consider as [Required] and finally !ModelState.IsValid will be always false. You can check here

Debug in asp.net core Older: 3.XXX:

Note: Here !ModelState.IsValid always true because in older version it will consider as nun-nullable and always consider true. You can check here

Solution:

You should redefine your public List<Movie> Movies { get; set; } and tell what kind of behavior should be expected here. But in dot net core 6 or higher version, it will autometically consider as false not matter you use dataAnnotation

answered Dec 7, 2022 at 3:34

Md Farid Uddin Kiron

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4 Comments

Goga Gate Over a year ago

big thanks. I'll keep in mind about the snippets 💯

Md Farid Uddin Kiron Over a year ago

Glad to assist you on this.

Goga Gate Over a year ago

Yesterday, when I was writing this question, I was having mental break down due to this error. I was like John Malkovich from the Space Force movie - youtube.com/watch?v=2zpCOYkdvTQ 😁

Md Farid Uddin Kiron Over a year ago

I got your point.

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