Validator.TryValidateObject Not Validating RangeAttribute

Question

Given the following object,

public class Question
{
    [Required]
    public string QuestionText { get; set; }

    [Range(1, 5)]
    public int Difficulty { get; set; }        
}

With the following Validation Code

ICollection<ValidationResult> results = new List<ValidationResult>();
Question question = new Question();
ValidationContext ctx = new ValidationContext(question, null, null);
Validator.TryValidateObject(question, ctx, results);
// results.Length = 1

Why does Range attribute not create a validation error when Required does (the value is 0 obviously)?

James Hughes · Accepted Answer · 2011-03-20 19:38:24Z

79

Ah so it would seem I need to specify validateAllProperties = true

Validator.TryValidateObject(question, ctx, results, true);

Incidentally what was throwing me off was the fact I had an abstract base class with another property in it and without validateAllProperties the Validator will stop on the first error of ALL superclasses too. So you will get a validation error for each superclass (in my case 2)

edited Mar 20, 2011 at 19:38

answered Mar 20, 2011 at 13:35

James Hughes

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6 Comments

James Hughes Over a year ago

The original post is nearly 3 years old, I'd expect some drift in behaviour.

Jochen van Wylick Over a year ago

Turned out my problem was slightly different - stackoverflow.com/questions/21111905/…

David Clarke Over a year ago

Still works for me 6 years later - behaviour hasn't drifted that much, and still a surprise to me that the default is false.

user1447679 Over a year ago

Goodness. I can't believe true isn't the default for this. What a headache. Thank you

Billy Jake O'Connor Over a year ago

I feel this is as appropriate of an API choice as having a method called ShouldExecuteCode. Thanks, I missed this.

|

Smartkid · Accepted Answer · 2011-11-23 15:07:58Z

23

Validator.TryValidatorObject(instance, validationContext, validationResults) calls Validator.TryValidateObject(instance, validationContext, validationResults, validateAllProperties) with validateAllProperties = false.

When validateAllProperties is false, only the RequiredAttribute will be validated.

answered Nov 23, 2011 at 15:07

Smartkid

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2 Comments

Shivprasad Koirala Over a year ago

My goodness what a mess is this. Hope Microsoft understand there is something called as the word "user friendly".

Kjensen Over a year ago

That is not intuitive at all. :(

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