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c#asp.net-mvcvalidationasp.net-mvc-viewmodel

How to make a something required AND use a regular expression attribute?

I have a viewmodel that works fine EXCEPT if the person enters nothing and hits submit, then i get a db error because the column doesn't except nulls.

I am doing

 if (ModelState.IsValid)

How can I make this Email field use a RegularExpression AND a required attribute at the same time?

public class RegistrationViewModel
{
    [RegularExpression(@"^......$", ErrorMessageType = ..., ErrorMessageResourceName = ...]
    public string Email {get;set;}

    ...
}
Solution

  • Just use the RequiredAttribute.

    [Required(AllowEmptyStrings = false)]

    Now, if there isn't a value it will fail and if there is one the RegularExpressionAttribute will validate it.