ModelState.IsValid does not exclude required property

Question

Im trying to exclude a required property(Password) so the modelstate dont validate that property, but for some reason it still validate even when i try to exclude it.

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Answer 1

I had success using the following method within ASP .NET MVC 2

TryUpdateModel(user);
ModelState.Remove("Password");
if (!ModelState.IsValid) return PartialView(user);

To keep the TryUpdate from binding to certain model properties you can create an inclusion template such as the one below:

public interface IUserValidateBindable
{
    string UserId { get; set; }
}

public class User : IUserValidateBindable
{
    [Required]
    public string UserId { get; set; }
    [Required]
    public string Password { get; set; }
}

The update the TryUpodateModel call as follows:

TryUpdateModel<IUserValidateBindable>(user);

Answer 2

I am currently experiencing a similar issue with MVC3.

Despite [Bind(Exclude = "Password")] in my Action, ModelState.IsValid still returns false.

I noticed that TryUpdateModel(user, null, null, new string[]{"Password"}); was successfully updating the model; however still returning false. I then found out (somewhere on stackoverflow, apologies for not having the link) that TryUpdateModel actually returns ModelState.IsValid.

Thus, the issue is not with TryUpdateModel, but with ModelState.IsValid.

NB: this also means that you do not need to verify this twice... you can use this code:

if (!TryUpdateModel(user, null, null, new string[]{"Password"}))
    return PartialView(user);

The issue thus appears as if ModelState is still validating properties that have been excluded from your FormCollection.

I was able to overcome this by removing the field from ModelState prior to calling TryUpdateModel:

ModelState.Remove("Password");

Note that TryUpdateModel still requires the list of properties to exclude from the update as per the above code.

Answer 3

in my case I face error on modelstate.isValid with Remove that it does not work for me in webapi asp.net mvc then I track the error

then I add model ModelState.Remove("model.Description"); that I defined model as parameter then I used name of parameter and then modelstate works for me like below:

Answer 4

I used with success [Bind(Exclude = "Property")] and ModelState.Remove("Property") together, and it worked like charm.

Answer 5

Seems like I'm replying too late, but I also faced the same problem.

Check your ModelState.Keys collection. Keys might be in the form of modelObjectName.Password and same for rest of model properties.

So in this case ModelState.Remove("Password") will not work. You should try ModelState.Remove("modelObjectName.Password")

Hope this resolve someone's issue :)

Answer 6

Maybe you should replace

TryUpdateModel(user, null, null, new[]{"Password"});

with

TryUpdateModel(user, null, null, new string[] {"Password"});

Because it might be confusing which overload for TryUpdateModel is using. Just saying...