How to not duplicate validation?

Question

Let's imagine I have a Service method which creates a customer:

public Customer CreateCustomer(string name)
{
  if (String.IsNullOrEmpty(name))
    throw new InvalidCustomerNameException(name);

  _customersRepository.Add(new Customer(name));
}

If this code is called from ASP.NET MVC I need to create ASP.NET MVC specific validation (to show to user which fields are filled incorrectly) before calling CreateCustomer. But in this case validation logic is duplicated. Is there any way to get rig of validation duplication?

Duplicate validation is not always a bad thing... Each layer should validate data according to their own needs and insights. — Henk Holterman
– Henk Holterman, Commented Jul 13, 2011 at 9:12

Serge S. · Accepted Answer · 2011-07-13 08:56:19Z

2

Take a look at FluentValidation framework.

You need just describe validation rules for certain model. It's integrative to ASP.NET MVC and may be used directly in code.

answered Jul 13, 2011 at 8:56

Serge S.

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Comments

driushkin · Accepted Answer · 2011-07-13 08:51:24Z

0

Take a look at DataAnnotations. I think in CRUD based app this is all you need. But I personally hate littering my classes with attributes.

answered Jul 13, 2011 at 8:51

driushkin

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