Dependent DataAnnotations MVC

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I was asked a question in an interview regarding validation with data annotations in MVC.

I have a drop down list and two text boxes.
If some value is selected from the drop down (say "XYZ"), then the apply validation on textboxes to be required else, textboxes can be left blank on submit.

Note: This shouldn't be handled via jQuery and custom annotations, only through data annotations.

I was left clueless. Is this question a valid one?

Appreciate any help.

Posted 10-Jun-15 5:46am

Adil S

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Ben J. Boyle · Accepted Answer · 2015-06-10T06:36:00

Couple of options:

1) Make your model class inherit from IValidatableObject and implement the validate method, see https://msdn.microsoft.com/en-us/library/system.componentmodel.dataannotations.ivalidatableobject.aspx[^]

That though is not using the Data Annotations, but...

2) https://github.com/JaroslawWaliszko/ExpressiveAnnotations[^] allows for a RequiredIF annotation that can compare against other values in the model.