How to make MVC Html.EditorFor ignore Form values

Question

I have a view for processing a credit card transaction. It uses a simple model containing a CreditCardNumber property. If there are errors I blank out the CreditCardNumber property on the model. The problem is that MVC goes ahead and fills in the CreditCardNumber. I am guessing it is looking at the posted form values and is trying to helpfully fill it back in for me. I don't want this.

How can I make MVC's Html.EditorFor not use the posted form values and use my model's property value exclusively?

What does your controller return on a failed request?

Kevin Stricker
– Kevin Stricker

2011-10-17 23:39:01 +00:00
Commented Oct 17, 2011 at 23:39 — Kevin Stricker
– Kevin Stricker, Commented Oct 17, 2011 at 23:39
An otherwise fully populate model

Mr Bell
– Mr Bell

2011-10-17 23:40:25 +00:00
Commented Oct 17, 2011 at 23:40 — Mr Bell
– Mr Bell, Commented Oct 17, 2011 at 23:40

Kevin Stricker · Accepted Answer · 2011-10-17 23:48:27Z

1

It should work correctly if you explicitly pass the edited model to the View call.

public ActionResult BuyNow(BuyNowViewModel vm)
{
  if (!ModelState.IsValid)
  {
      vm.CreditCardNumber = null;
      return View(vm);
  }
}

edited Oct 17, 2011 at 23:48

answered Oct 17, 2011 at 23:42

Kevin Stricker

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4 Comments

Tr1stan Over a year ago

But you'll only want to do this if !ModelState.IsValid right?

Kevin Stricker Over a year ago

Right. Or some other non-standard validation code fails somewhere (one never knows, thanks for the suggestion).

Mr Bell Over a year ago

This is exactly what I am already doing. The model does not contain the CreditCardNumber when its passed to the view

Kevin Stricker Over a year ago

You might need to post some code in order to troubleshoot this issue, because what you're describing isn't normal.

AFrieze · Accepted Answer · 2013-02-19 17:35:40Z

0

Your View is checking your ModelState first, then your ViewModel. So if you manually change values, you need to clear your ModelState.

ModelState.Clear();

Useful blog on the subject: http://balawinwin.wordpress.com/2012/11/24/asp-net-mvcs-html-helpers-ignoring-model-changes/

answered Feb 19, 2013 at 17:35

AFrieze

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