DataAnnotations tryvalidateobject 总是 returns true

Question

namespace ClassValidation
{
    public class Student
    {
        [Required(ErrorMessage = "Name is required")]
        public String Firstname;


        [Required(ErrorMessage = "Email is required")]
        public String personalEmail;


            }
}


private static void Main(string[] args)
        {

            Student student = new Student();
            student.personalEmail = "del";


            ValidationContext context = new ValidationContext(student, null, null);
            List<ValidationResult> results = new List<ValidationResult>();
            bool valid = Validator.TryValidateObject(student, context, results, true);

            if (!valid)
            {
                foreach (ValidationResult vr in results)
                {
                    Console.ForegroundColor = ConsoleColor.Red;
                    Console.Write("   ::  {0}{1}", vr.ErrorMessage, Environment.NewLine);

                }

            }
        }

Answer 1

验证器忽略字段上的 [RequiredAttribute] - 它只考虑帐户属性；因此，为了 Validator.Validate - 将您的 class 更改为：

public class Student
{
  [Required(ErrorMessage = "Name is required")]
  public String Firstname { get; set; }


  [Required(ErrorMessage = "Email is required")]
  public String personalEmail { get; set; }
}

Answer 2

如果深入研究验证器源代码，您会注意到 TryValidateObject 只会验证属性，而不是字段。更具体地说，您会注意到它使用了 GetObjectPropertyValidationErrors（省略了字段）。

无论如何，我认为您没有真正的理由在这里使用 public 字段，因此最简单的解决方法是使用属性

public class Student
{
    [Required(ErrorMessage = "Name is required")]
    public string FirstName { get; set; }

    [Required(ErrorMEssage = "Email is required")]
    public string PersonalEmail { get; set; }
}

DataAnnotations tryvalidateobject 总是 returns true

DataAnnotations tryvalidateobject always returns true

c#

data-annotations