如何在asp.net mvc中为复杂类型选择验证？

Question

I want to display an editor for a type User. User contains a field Address of type Address. I made an editor template for the type Address so that it is reusable.

I don't want the field Address to be required for creating a user. But some fields are required for Address, for example country, state etc.

I want to validate Address if I receive any data for it, if I don't receive anything, then I don't want to return any validation error to the UI for Address. I would return only validation errors for User then.

What would be the best way to do this?

Thanks,

Answer 1

I used some code from Simon J Ince of Microsoft. He has it here on his blog. It also has client side validation which is also nice. It has a RequiredIf attribute that only makes a field required if another field has a certain value. Just being able to see how he implemented it helped me figure out how to do some of this stuff by myself and I even retrofitted it to allow multiple values.

Answer 2

I have found that more complex custom validation is easier with FluentValidation . The documentation provided is very helpful, and you will be able to achieve your validation goal with this open source validator.

Answer 3

You might want to look into a Custom Model Binder for your User type. That way you can choose to override the validation of the Address item inside a User.