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c#validationmodel-view-controllerasp.net-mvc-5
serlingpa
serlingpa

Reputation: 12660

Required attribute on custom classes

I am building an MVC 5 app and have come to the point where I need to validate user input.

I would like to apply a [Required] attribute to a class that is not a built-in data type. Here is a snippet of my view model:

public class GraffitiViewModel : EformBase
{
    [Required(ErrorMessage = "Please select yes or no")]
    public RadioButtonList<YesNoType> GraffitiOffensive { get; set; }
    [Required(ErrorMessage = "Please select yes or no")]
    public RadioButtonList<YesNoType> GraffitiTag { get; set; }
    // ... more stuff here
}

The RadioButtonList is a class that emits HTML markup for corresponding C# radio button definitions. The [Required] attribute is not working in this context. Is there a way I can extend either my RadioButtonList class, or the [Required] attribute, so I don't have to modify my ViewModel?

I am thinking along the lines of a custom attribute that will perform this validation or a method in my RadioButtonList that will return a bool indicating whether or not the validation succeeded.

Looking forward to your responses!

M

Upvotes: 2

Views: 14906

Answers (1)

demoncodemonkey
demoncodemonkey

Reputation: 11957

The [Required] attribute should fire if:

  • the property is null
    OR
  • the property is a string type, which is either empty or whitespace

See MSDN for more details.

Alternatively you can use the code here to create a custom attribute which fires on whatever conditions you decide.

Upvotes: 1

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