Update Mode State

Model State 是个Dictionaty 类型，用于存储验证错误信息。

@Html.ValidationMessage()

@Html.ValidationSummary() +

[AcceptVerbs(HttpVerbs.Post)]

public ActionResult Create(Person person)

{

    if (person.Name.Trim().Length == 0)

    {

        ModelState.AddModelError("Name", "Name is required.");

    }

    if (person.Age < 1 || person.Age > 200)

    {

        ModelState.AddModelError("Age", "Age must be within range 1 to 200.");

    }

    if ((person.Zipcode.Trim().Length > 0) &&(!Regex.IsMatch(person.Zipcode, @"^\d{5}$|^\d{5}-\d{4}$")))

    {

        ModelState.AddModelError("Zipcode", "Zipcode is invalid.");

    }

    if (!Regex.IsMatch(person.Phone, @"((\(\d{3}\)?)|(\d{3}-))?\d{3}-\d{4}"))

    {

        ModelState.AddModelError("Phone", "Phone number is invalid.");

    }

    if (!Regex.IsMatch(person.Email, @"^[\w-\.]+@([\w-]+\.)+[\w-]{2,4}$"))

    {

        ModelState.AddModelError("Email", "Email format is invalid.");

    }

    if (!ModelState.IsValid)

    {

        return View("Create", person);

    }

 

    people.Add(person);

 

    return RedirectToAction("Index");

}