I'm trying to set a validation rule for a int value in my model.
The value can only be 1 , 2 or 4. so i cant use a range validation rule. How should i validate if the number is valid ?
i could not find anything but range, so unfortunately i don't have anything yet.
Something like
[RegularExpression("[124]", ErrorMessage = "Value must be 1, 2 or 4")]
public int Value{ get; set; }
The RegularExpression validator with a valid set of values [124] is the obvious option.
However, i have found an interesting alternative that has definitely better performance than the RegularExpression validator. The idea is to use an EnumDataType validator with valid values for the integers:
[EnumDataType(typeof(ValidValues), ErrorMessage = "Valid values are 1,2,4")]
public int ReqValue { get; set; }
public enum ValidValues
{
First = 1,
Second = 2,
Fourth = 4
}
Add this code to your project: Get the "Key" for a strongly typed model in the controller
Then add a method which performs the validation, say, void Validate(YourModelType model).
Finally, in your POST action, put something like this:
Validate(model);
if (ModelState.IsValid) {
//valid, do whatever actions you need
return RedirectToAction("whatever");
}
return View(model); //show the page again
