CODEWITHSUNDEEP
c#entity-frameworkef-code-firstcode-first
Jorge Díaz
Jorge Díaz

Reputation: 147

How to set an Entity to only accept specific values with code-first approach?

I'm currently setting up a database using Entity Framework Code First, and I got the next field:

[Required]
public string Month { get; set; }

What I want to do, is to only allow certain inputs to be accepted in the field. For example, I want Month to only accept [01,02,03,04,05,06,07,08,09,10,11,12]. How should I approach this? I couldn't find any DataAnnotation to solve my problem.

Upvotes: 1

Views: 1459

Answers (1)

Yuliam Chandra
Yuliam Chandra

Reputation: 14640

You can implement IValidatableObject to validate Month.

public class YourEntity : IValidatableObject
{
    [Required]
    public string Month { get; set; }

    public IEnumerable<ValidationResult> Validate(
        ValidationContext validationContext)
    {
        var months = Enumerable.Range(1, 12).Select(x => x.ToString("00"));
        if (!months.Contains(Month))
        {
            yield return 
                new ValidationResult("Invalid month value.", new[] { "Month" });
        }
    }
}

More

Upvotes: 2

Related Questions