如何在C＃中的自我属性对象中使用验证？

Question

I'm developing a little ERP to my company and I crashed into a problem about validation:

I have self property object like:

public class Person
{
   [Required]
   public string Name { get; set; }
   public int Phone { get; set; }
   public bool HasContact { get; set; }

   public Person Contact { get; set; }
}

If HasContact is false, I don`t want put a Contact. If is true, I want.

The problem is my ModelState never is Valid, because Name is Required and Contact self implement Person.

I would like to set condition if HasContact is true, my application try validate the Contact property. If is not, set Valid and execute controller correct.

Is it possible or am I crazy?

Answer 1

You should have your object implement IValidatableObject . It lets you implement your own validation logic so you can ignore properties as necessary (see this SO question ).

Your code might be something like this:

public IEnumerable<ValidationResult> Validate(ValidationContext validationContext)
{
    var results = new List<ValidationResult>();
    if (this.HasContact)
    {
        Validator.TryValidateProperty(this.Contact,
            new ValidationContext(this, null, null) { MemberName = "Contact" },
            results);
    }
    return results;
}