Manually validate Model in Web api controller

Question

I have a class called \'User\' and a property \'Name\'

public class User
{
    [Required]
    public string Name { get; set; }
}

And api co

Answer 1

You will need to define custom Validation Attribute as

class CustomValidatorAttribute : ValidationAttribute
{
  //custom message in ctor
  public CustomValidator() : base("My custom message") {}
  public CustomValidator(string Message) : base(Message) {}
  public override bool IsValid(object value)
  {
     return !string.IsNullOrWhiteSpace(value.ToString());
  }
  //return a overriden ValidationResult
  protected override ValidationResult IsValid(Object value,ValidationContext validationContext)
  {
     if (IsValid(value)) return ValidationResult.Success;
     var message = "ohoh";
     return new ValidationResult(message);
  }
 }

likewise in your model class

public class User
{
  [Required]
  [CustomValidator("error")]
  public string Name { get; set; }
}