Model [Required(ErrorMessage = “You must provide a phone number”)] [Display(Name = “Home Phone”)] [DataType(DataType.PhoneNumber)] [RegularExpression(@”^\(?([0-9]{3})\)?[-. ]?([0-9]{3})[-. ]?([0-9]{4})$”, ErrorMessage = “Not a valid phone number”)] public string PhoneNumber { get; set; } View: @Html.LabelFor(model => model.PhoneNumber) @Html.EditorFor(model => model.PhoneNumber) @Html.ValidationMessageFor(model => model.PhoneNumber)
Here’s how you could obtain the other property value: public class CustomAttribute : ValidationAttribute { private readonly string _other; public CustomAttribute(string other) { _other = other; } protected override ValidationResult IsValid(object value, ValidationContext validationContext) { var property = validationContext.ObjectType.GetProperty(_other); if (property == null) { return new ValidationResult( string.Format(“Unknown property: {0}”, _other) ); } var otherValue … Read more
I had the same problem yesterday, but I did it in a very clean way which works for both client side and server side validation. Condition: Based on the value of other property in the model, you want to make another property required. Here is the code: public class RequiredIfAttribute : RequiredAttribute { private String … Read more