I've trying to validate a property on a model I have. This property is NOT required, and so if its invalid MVC seems to be ignoring it. I've even created a custom ValidationAttribute, but nothing works.
public class NumberWang : ValidationAttribute
{
public override bool IsValid(object value)
{
if (value == null)
return true;
int g;
if (int.TryParse(value.ToString(), out g))
{
if (g >= 0)
return true;
}
return false;
}
}
public class MyModel
{
[Range(0, 999999, ErrorMessage = "category_id must be a valid number")]
[NumberWang(ErrorMessage = "That's NumberWang!")]
public int? category_id { get; set; }
/* there are other properties of course, but I've omitted them for simplicity */
public void Validate()
{
Validator.TryValidateProperty(this.category_id,
new ValidationContext(this, null, null) { MemberName = "category_id" },
this.validation_results);
}
}
If I pass the value 'abc' as a category_id to this model, it validates just fine. What am I doing wrong?
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