Range validation attribute not validating

Question

I have an object, lets say this:

public class Person{
    [Range(1, 100)]
    public int Id {get;set;}

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

As you can see the Id should atleast contain 1 and the name field is required.

I have this validation method:

private static void ValidateObject(Person obj){
    var context = new ValidationContext(obj, serviceProvider: null, items: null);
    var results = new List<ValidationResult>();

    var isValid = Validator.TryValidateObject(obj, context, results);

    if (!isValid)
    {
        throw new InvalidOperationException(results.First().ErrorMessage);
    }        
}

If I leave the Name empty, it will throw an error. Correct! If I leave the Id to 0, it will NOT throw an error. And this is what I can't figure out. The variable isValid is also true (should be false)

What am I doing wrong?

Answer 1

Try to adjust the call to Validator.TryValidateObject with an extra parameter called 'validateAllProperties' and set it to true. If you omit it or set it to false (default) not-required properties will not be validated.

private static void ValidateObject(Person obj){
    var context = new ValidationContext(obj, serviceProvider: null, items: null);
    var results = new List<ValidationResult>();

    var isValid = Validator.TryValidateObject(obj, context, results, true);

    if (!isValid)
    {
        throw new InvalidOperationException(results.First().ErrorMessage);
    }        
}