C# validation attributes for derived class

Question

I have a base class with some properties:

public class A
{
   [Display(Name = "Some Property")]
   public virtual int SomeProperty {get;set;}
}

and its derived class:

public class B:A
{
   [Required]
   public override int SomeProperty {get;set;}
}

But in fact, when I extract metadata for class B to ModelMetadata, IsRequired property is set to false. Is there a way to apply Required attribute, so it was reflected in ModelMetadata?

Review this SO [topic](https://stackoverflow.com/questions/1240960/how-does-inheritance-work-for-attributes) — Alexander I., Feb 12 '19 at 18:37

Ahmad Javadi Nezhad · Answer 1 · 2019-02-12T18:56:48.257

0

Please try the example below:

public class A
{
    [Display(Name = "Some Property")]
    public virtual int SomeProperty { get; set; }
}
public class B : A
{
    [MyRequired]
    public override int SomeProperty { get; set; }
}

[AttributeUsage(AttributeTargets.Property, Inherited = true)]

public class MyRequiredAttribute : RequiredAttribute
{

}

finally:

edited Feb 12 '19 at 18:56

answered Feb 12 '19 at 18:53

Ahmad Javadi Nezhad

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And why would subclassing `RequiredAttribute` work if using `RequiredAttribute` doesn't? – Heretic Monkey Feb 12 '19 at 18:55
Because you have to set inherited property true – Ahmad Javadi Nezhad Feb 12 '19 at 18:59

C# validation attributes for derived class

1 Answers1