validation - CustomValidationAttribute doesn't work when other attributes are applied to the class -

reproduction:

imports system.componentmodel imports system.componentmodel.dataannotations module module1    sub main()     dim type = gettype(contact)     typedescriptor.addprovidertransparent(       new associatedmetadatatypetypedescriptionprovider(type), type)       dim contact new contact     dim context new validationcontext(contact, nothing, nothing)     dim errors new list(of validationresult)     dim result = validator.tryvalidateobject(contact, context, errors, true)   end sub end module  <customvalidation(gettype(contact.contactmd), "*********************")> <metadatatype(gettype(contact.contactmd))> public class contact    public property email string   public property emailrepeat string    public class contactmd      '<required()>     public property email     '<required()>     public property emailrepeat      public shared function validateemails(byval contact contact) _         validationresult       return if(contact.email = contact.emailrepeat,                 validationresult.success,                 new validationresult("fail!"))     end function   end class end class 

the above code throw exception:
the customvalidationattribute method '*********************' not exist in type 'contactmd' or not public , static.

this exception justified , it's sign things working. once uncomment required attributes on properties in md class, exception not throw, means, validation system doesn't validate both property-typed attributes , class-level attributes.

any workaround?

the answer is, validation system validates property validation attributes first (the required attributes in case), , proceed customvalidationattribute if object passed property attributes.

so per reproduction above, changing line

dim contact new contact 

to (allowing enitity pass property validation):

dim contact new contact { .email = "*", .emailrepeat = "*" } 

will throw expected exception.