数据注释不适用于 [必需（错误消息 = ......）]

Question

我不理解 ModelState.IsValid，我相信这就是我在 CreateContact Action 方法中所缺少的。请解释一下，我应该如何检查 If(ModelState.IsValid)？我的验证不起作用。如果文本框（或模型属性）为空，我应该看到一条错误消息。如果它符合验证规则，我应该能够将日期保存到数据库并在单击提交按钮后重定向到“AddContactDetails”操作方法。查看模型public class CreateContactStepOne{    public int PersonID { get; set; }    [Required(ErrorMessage = "Nickname is required and keep it short upto 10 characters")]    [Display(Name = "Nickname:")]    [RegularExpression("^[a-zA-Z. ]{1,10}$", ErrorMessage = "Only letters and no numbers or special characters allowed. Also, limit your First Name to 10 character length.")]    public string NickName { get; set; }    [Required(ErrorMessage = "First Name is required")]    [Display(Name = "First Name:")]    [RegularExpression("^[a-zA-Z. ]{1,25}$", ErrorMessage = "Only letters and no numbers or special characters allowed. Also, limit your First Name to 25 character length.")]    public string FirstName { get; set; }    [Required(ErrorMessage = "Last Name is required")]    [Display(Name = "Last Name: ")]    [RegularExpression("^[a-zA-Z. ]{1,25}$", ErrorMessage = "Only letters and no numbers or special characters allowed. Also, limit your Last Name to 25 character length.")]    public string LastName { get; set; }    [Required(ErrorMessage = "Select Phone type and enter a phone number below")]    [Display(Name = "Phone: ")]    //[RegularExpression("^[0-9-]{1,12}$", ErrorMessage = "Please enter the correct format. Example 717-123-4567")]    public Phone PhoneNumber { get; set; }    [Required(ErrorMessage = "Phone number is required")]    [RegularExpression(@"^\(?\d{3}\)?[\s.-]\d{3}[\s.-]\d{4}$", ErrorMessage = "Please enter the correct format. Example [phone]")]    public string ContactPhoneNumber { get; set; }}public enum Phone{    Mobile, Office, Home}

Answer 1

您只需在Home Controller的CreateContact操作中添加ModelState 验证即可。

[HttpPost]

public ActionResult CreateContact(CreateContactStepOne contact)

{

        // add this section to the top of your action

        if(!ModelState.IsValid)

        {

           return View("viewName", contact);

        }

        person p = new person();

        p.FirstName = contact.FirstName;

        p.LastName = contact.LastName;

        if (contact.PhoneNumber == Phone.Home)

        {

            p.HomePhone = contact.ContactPhoneNumber.ToString();

        }

        else if (contact.PhoneNumber == Phone.Mobile)

        {

            p.MobilePhone = contact.ContactPhoneNumber.ToString();

        }

        else if (contact.PhoneNumber == Phone.Office)

        {

            p.OfficePhone = contact.ContactPhoneNumber.ToString();

        }

        PhonebookEntities db = new PhonebookEntities();

        db.people.Add(p);

        db.SaveChanges();

        //Redirect to ActionMethod ContactDetails and passes the personID as parameter

        return RedirectToAction("AddContactDetails", new { id = p.PersonID });

}

Answer 2

添加if(!ModelState.IsValid)return View(contact);到CreateContact操作

[HttpPost]

    public ActionResult CreateContact(CreateContactStepOne contact)

    {

            if(!ModelState.IsValid)return View(contact);

            person p = new person();

            p.FirstName = contact.FirstName;

            p.LastName = contact.LastName;

            if (contact.PhoneNumber == Phone.Home)

            {

                p.HomePhone = contact.ContactPhoneNumber.ToString();

            }

            else if (contact.PhoneNumber == Phone.Mobile)

            {

                p.MobilePhone = contact.ContactPhoneNumber.ToString();

            }

            else if (contact.PhoneNumber == Phone.Office)

            {

                p.OfficePhone = contact.ContactPhoneNumber.ToString();

            }

            PhonebookEntities db = new PhonebookEntities();

            db.people.Add(p);

            db.SaveChanges();

            //Redirect to ActionMethod ContactDetails and passes the personID as parameter

            return RedirectToAction("AddContactDetails", new { id = p.PersonID });

    }