How Can I Use Data Annotations Attribute Classes to Fail Empty Strings in Forms?

Question

I was trying to require a text input field in a form, which implies that there needs to be something in the form. However, adding a [Required] tag to my model w

Answer 1

I'd implement a new validation attribute like this and apply it to my model.

public class RequiredNotEmptyAttribute : RequiredAttribute
{
    public override bool IsValid(object value)
    {
        if(value is string) return !String.IsNullOrEmpty((string)value);

        return base.IsValid(value);
    }
}

This will only work on the server side (client side will still only check for null).