Question

Suppose I have 3 fields on a Silverlight based xaml page

Color, Size and SurpriseMe

where none of the fields are required and SurpriseMe is a checkbox initially set to checked.

I want to create the following behavior:

• When SurpriseMe is cleared,

  1. Display the required field data annotations for Color and Size
  2. Enforce the required Validation

• When SurpriseMe is checked,

  1. Remove the required field data annotation
  2. remove the restriction

Is there any easy way to do this?

Answer 1

You need to provide custom validation (see CustomValidationAttribute). You can roll your own or use a library like Fluent Validation.