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 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.