My question is hopefully pretty straight forward.
Upon submitting my form, I would like to flag all properties (fields) that have invalid characters (specifically HTML) as model errors.
The issue I am facing is that Request Validation kicks in before model binding/validation and I get HTTP 500...
I saw a similar question that advertises either using [AllowHtml]
property attribute on your Model/ViewModel or using <httpRuntime requestValidationMode="2.0" />
in web.config, but what I am looking for is how to "globally catch Request Validation exceptions and show them as model errors". Furthermore, I don't want to "strip" HTML tags, I want to notify the user that their input is not valid.
I thought about using Regular Expression validation attributes to find bad input, but as I mentioned, the Request Validation on ASP.NET MVC3 occurs before model binding/validation, so that is a no-go...
A really good overview of the Request Validation can be found here.
I think your only intention is to get the Request Validation exception during model binding and show the errors as model state error. Here is the sample,
using System.Web.Helpers;
public class MyModelBinder : DefaultModelBinder
{
public override object BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext)
{
try
{
return base.BindModel(controllerContext, bindingContext);
}
catch(HttpRequestValidationException ex)
{
var modelState = new ModelState();
modelState.Errors.Add(ex.Message);
var key=bindingContext.ModelName;
var value = controllerContext.RequestContext.HttpContext.Request.Unvalidated().Form[key];
modelState.Value = new ValueProviderResult(value, value,CultureInfo.InvariantCulture);
bindingContext.ModelState.Add(key, modelState);
}
return null;
}
}
protected void Application_Start()
{
AreaRegistration.RegisterAllAreas();
ModelBinders.Binders.DefaultBinder = new MyModelBinder();
}
This will add the exception of only request validation in model state. Sorry, If I don't understand your question clearly.
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