MVC3 Bind validation in controller

Question

I spent a good amount of time on google and cannot find the answer.

Instead of having an attribute in the model class like

public class MyModel
{
   [Required]
   public string Name {get; set;}
}

Can I add the Required requirement in the controller instead of attribute?

I am expecting something like ValidationProvider.Add(some model properties, some constraints) Have anyone done that before?

thanks for your reply.... but I am so sure that it is the only way out in my situation. Is there anything like ValidationProvider.Add(some property, some contraint) ? — Kenneth Lam
– Kenneth Lam, Commented Nov 26, 2012 at 16:25

Marius Schulz · Accepted Answer · 2012-11-24 01:29:44Z

2

Yeah sure you can (in controller method):

if(string.IsNullOrWhiteSpace(model.Name))
  ModelState.AddModelError("Name", "Name is required");

if(!ModelState.IsValid)
  return View();

But really you should use the attributes, or implement IValidatableObject on your model class. Keeps things nicely separated.

edited Nov 24, 2012 at 1:29

Marius Schulz

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answered Nov 24, 2012 at 1:23

Andras Zoltan

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4 Comments

Kenneth Lam Over a year ago

This is not something I am looking for. I wanna bind a validation which mean it will work on the front end as well. The code here is forcefully push an error in the validation.

Andras Zoltan Over a year ago

Okay - well it's always helpful to include that in the question ;) In short - yes - it can be done - but you will need to implement your own ModelMetadataProvider - I can't really give you code for that but I'm sure if you google around and read MVC articles and stuff you'll figure it out.

Kenneth Lam Over a year ago

Andras, thanks for your reply. I really spend a good deal of time to google it. It will be great if you can post a link for that. I may search in a wrong direction.

Andras Zoltan Over a year ago

sorry @KennethLam there's no ready-rolled solution I know of, and the code to do such a thing would simply take too long and make an answer that's too long to read. I strongly suggest getting hold of the MVC source, and looking at the existing provider to see how you can extend it.

Kath · Accepted Answer · 2012-11-24 01:13:14Z

0

If you can use HTML5 you can use the required attribute in the field itself (in the view). Also consider the FluentValidation for .Net (http://fluentvalidation.codeplex.com/). Or you can use knockoutjs framework to control required fields.

answered Nov 24, 2012 at 1:13

Kath

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1 Comment

Kenneth Lam Over a year ago

The logic needs to be in the controller.

spadelives · Accepted Answer · 2012-11-24 08:47:34Z

0

You shouldn't because if you do, the attribute won't be required at the data layer and there will be no corresponding database constraint.

answered Nov 24, 2012 at 8:47

spadelives

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1 Comment

Kenneth Lam Over a year ago

It has nothing to do with database. Model can be a custom create model.

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