Support for MVC modeling

Question

Today (January 15, 2010) Scott posted a blog on ASP.NET MVC2 model validation

http://weblogs.asp.net/scottgu/archive/2010/01/15/asp-net-mvc-2-model-validation.aspx

Does anyone know how someone can add validation rules at runtime programmatically?

"Programmatic Registration" is similar functionality supported by ValidationAspects

// register lambda syntax validation functions
typeof(User).GetProperty("Name").AddValidation<string>((name, context) => 
  { if (!Exists(name)) { throw new ValidationException("Username is unknown"); } } );

// register validation factories (classes)
typeof(User).GetProperty("Name").AddValidation(new [] { new NotNullOrEmpty()} );

// don't like strings?
TypeOf<User>.Property(user => user.Name).AddValidation(new [] { new NotNullOrEmpty()} );

Answer 1

To provide custom metadata, you have to implement the abstract ModelMetadataProvider class and register it inside your global.asax:

           ModelMetadataProviders.Current = new ConventionMetadataProvider();

. ModelMetadata, HTML.EditorFor.

Answer 2

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