Customizing data annotation attributes for ASP.NET MVC

Question

I would like to customize at runtime the attributes that MVC sees on a view model property. As far as I know, MVC relies internally on type descriptors to enumerate the attributes. Is there a way to hook a type descriptor somewhere to return a custom list of attributes for a property?

Darin Dimitrov · Accepted Answer · 2013-07-31 11:56:54Z

1

Is there a way to hook a type descriptor somewhere to return a custom list of attributes for a property?

It depends. If you want to override the Data Annotations used by the metadata provider then you could write your own custom ModelMetadataProvider and replace the default one (DataAnnotationsModelMetadataProvider). This allows you to have a custom metadata provider for a given type and return this information at runtime.

If on the other hand you are doing validation, then you are a bit out of luck. For more flexibility I would recommend you using FluentValidation.NET instead of data annotations.

answered Jul 31, 2013 at 11:56

Darin Dimitrov

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