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POCustom Validation Attribute with Custom Model Binder in MVC 2
 

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  1. POCustom Validation Attribute with Custom Model Binder in MVC 2
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    <p>I apologise for the amount of code I have included. I've tried to keep it to a minimum.</p> <p>I'm trying to have a Custom Validator Attribute on my model as well as a Custom Model binder. The Attribute and the Binder work great seperately but if I have both, then the Validation Attribute no longer works.</p> <p>Here is my code snipped for readability. If I leave out the code in global.asax the custom validation fires but not if I have the custom binder enabled.</p> <p>Validation Attribute;</p> <pre><code>public class IsPhoneNumberAttribute : ValidationAttribute { public override bool IsValid(object value) { //do some checking on 'value' here return true; } } </code></pre> <p>Useage of the attribute in my model;</p> <pre><code> [Required(ErrorMessage = "Please provide a contact number")] [IsPhoneNumberAttribute(ErrorMessage = "Not a valid phone number")] public string Phone { get; set; } </code></pre> <p>Custom Model Binder;</p> <pre><code>public class CustomContactUsBinder : DefaultModelBinder { protected override void OnModelUpdated(ControllerContext controllerContext, ModelBindingContext bindingContext) { ContactFormViewModel contactFormViewModel = bindingContext.Model as ContactFormViewModel; if (!String.IsNullOrEmpty(contactFormViewModel.Phone)) if (contactFormViewModel.Phone.Length &gt; 10) bindingContext.ModelState.AddModelError("Phone", "Phone is too long."); } } </code></pre> <p>Global asax;</p> <pre><code>System.Web.Mvc.ModelBinders.Binders[typeof(ContactFormViewModel)] = new CustomContactUsBinder(); </code></pre>
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    1. USgriegs
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    1. COTechnically, you aren't really doing any model binding with your custom model binder. This is just using a model binder for validation only (which isn't what model binders are for). If you really need to have a separate validation for the phone number length, this could be an attribute as well.
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      1. POCustom Validation Attribute with Custom Model Binder in MVC 2
      1. USDerek Greer
    2. CO@Derek, whilst I agree with you I am using this as an example to the guys here on what is possible. I have propper binding code in there as well and what I presented here is a snippet only
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