首先，在您的控制器中确保您使用ModelState.IsValid进行验证。比较常见的错误之一是使用HttpContext.Current而不是ModelState.IsValid来验证。具体代码示例如下：

[HttpPost]
public ActionResult Create(Student student)
{
    if (ModelState.IsValid)
    {
        db.Students.Add(student);
        db.SaveChanges();
        return RedirectToAction("Index");
    }

    return View(student);
}

如果您的控制器存在嵌套属性的复杂模型，则需要手动调用验证器，以确保属性级别的验证器在模型的层次结构中正确触发。例如：

[HttpPost]
public ActionResult Create(Course course)
{
    ValidateCourse(course);

    if (ModelState.IsValid)
    {
        db.Courses.Add(course);
        db.SaveChanges();
        return RedirectToAction("Index");
    }

    return View(course);
}

private void ValidateCourse(Course course)
{
    if (course.InstructorID == null)
    {
        ModelState.AddModelError("InstructorID", "The instructor field is required.");
    }
    ...
}

您还可以检查自定义的模型验证器进行排除。确保您的验证器正确设置错误消息并将其添加到模型状态中，如下所示：

public class StudentMetadata
{
    [Required(ErrorMessage = "The first name field is required.")]
    public string FirstName { get; set; }

    [StringLength(50, MinimumLength = 2, ErrorMessage = "The last name must be between 2 and 50 characters.")]
    public string LastName { get; set; }
}

[MetadataType(typeof(StudentMetadata))]
public partial class Student
{
    // Here you can add custom validation rules for Student
    // e.g. [Compare("Email", ErrorMessage = "The email and confirm email must match.")]
}

[HttpPost]
public ActionResult Create(Student student)
{
    if (ModelState.IsValid)
    {
        db.Students.Add(student);
        db.SaveChanges();
        return RedirectToAction("Index");
    }

    return View(student);
}