为什么我的验证不起作用？ asp.net mvc

Question

我尝试在我的视图中添加ValidationMessageFor 来控制数据，但它不起作用，数据进入我的发布操作。

这是我的模型类：

 public enum CustomerType
    {
        JuridicalPerson,
        NaturalPerson
    }
    public class Customer
    {
        [Key]
        [DisplayName("ID")]
        public int CustomerId { get; set; }
        [Required(ErrorMessage = "Please enter your first name")]
        [DisplayName("First name")]
        [DataType(DataType.Text)]
        public string FirstName { get; set; }
        [Required(ErrorMessage ="Please enter your last name")]
        [DisplayName("Last name")]
        [DataType(DataType.Text)]
        public string LastName { get; set; }
        [Required(ErrorMessage ="Please choose your customer type")]
        [DisplayName("Customer type")]
        public CustomerType CustomerType { get; set; }

这是我的创建客户视图：

@model Contracts.Models.Customer

@using (Html.BeginForm())
{
    <div class="box">
        <div class="input-container">
            @Html.LabelFor(model => model.FirstName)
            <br />
            @Html.EditorFor(model => model.FirstName)
            @Html.ValidationMessageFor(model => model.FirstName)
        </div>
        <div class="input-container">
            @Html.LabelFor(model => model.LastName)
            <br />
            @Html.EditorFor(model => model.LastName)
            @Html.ValidationMessageFor(model => model.LastName)
        </div>
        <div class="input-container">
            @Html.LabelFor(model => model.CustomerType)
            <br />
            @Html.EnumDropDownListFor(model => model.CustomerType, "Select a type", new {@class ="input-container" })
            @Html.ValidationMessageFor(model => model.CustomerType)
        </div>
        <input class="btn" type="submit" value="Create" />
    </div>
}

最后这是我的客户控制器及其创建客户的操作：

 [HttpPost]
        public ActionResult Create(Customer customer)
        {
//db is my database context
            db.Customers.Add(customer);
            db.SaveChanges();
            return RedirectToAction("Index");
        }

实际上，在我看来，使用 html 助手验证，空输入应该会给出错误，而不是执行我的操作，但不起作用

如果你能帮助我，我将不胜感激

Answer 1

尝试使用

if (ModelState.IsValid){
        db.Customers.Add(customer);
        db.SaveChanges();
        return RedirectToAction("Index");} return Page();