Question

This is My Model:

public class PhoneNumber {

    public long Id { get; set; }
    public string Tel1 { get; set; }
    public string Tel2 { get; set; }
}

How can I force Clients in create action to fill at least One Tel (Tel1 or Tel2), I don’t want to use any Clients Script, Or Controller Code, I just interested in use some attributes in above Model like [Required] to achieve this goal?

Answer 1

Just Change Model and use Custom Validator like this:

public class PhoneNumber : IValidatableObject {

    public long Id { get; set; }
    public string Tel1 { get; set; }
    public string Tel2 { get; set; }


public IEnumerable<ValidationResult> Validate(ValidationContext validationContext) 
{

        var field1 = new[] { "Tel1" };
        var field2 = new[] { "Tel2" };

        if (string.IsNullOrEmpty(Tel1))
            if (String.IsNullOrEmpty(Tel2))
yield return new ValidationResult("At least Fill one of Tel1 or Tel2‏", field1);

        if (string.IsNullOrEmpty(Tel2))
        if (String.IsNullOrEmpty(Tel1))
yield return new ValidationResult("At least Fill one of Tel1 or Tel2", field2);
    }
}