自定义数据注释永远不会调用IsValid.(ASP.NET MVC 2 .NET 4)

Question

我有一个自定义数据验证属性我创建,以确保用户输入的密码是相同的,但从不调用IsValid.

自定义属性:

public class IsSameAsAttribute : ValidationAttribute
{
    public String TargetProperty { get; set; }
    private readonly object _typeId = new object();

    public IsSameAsAttribute(string targetProperty)
    {
        TargetProperty = targetProperty;
    }

    public override bool IsValid(object value)
    {
        return false;
        //Type objectType = value.GetType();
        //bool isValid = false;

        //PropertyInfo[] neededProperties =
        //    objectType.GetProperties().Where(propertyInfo => propertyInfo.Name == TargetProperty).ToArray();

        //return isValid;
    }

    public override object TypeId
    {
        get { return _typeId; }
    }
}

---

它适用的数据模型:

public class RegistrationData
{
    [Required(ErrorMessage = "First Name Required")]
    [StringLength(100, ErrorMessage = "First Name must be 100 characters or less.")]
    public String FirstName { get; set;}

    [Required(ErrorMessage = "Last Name Required")]
    [StringLength(100, ErrorMessage = "Last Name must be 100 characters or less.")]
    public String LastName { get; set; }

    [Required(ErrorMessage = "Email is Required")]
    [StringLength(200, ErrorMessage = "Email must be 200 characters or less.")]
    [RegularExpression(@"\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*", ErrorMessage = "Valid Email Address is required.")]
    public String Email { get; set; }

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

    [IsSameAs("Password")]
    public String PasswordRepeat { get; set; }

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

}

---

控制器从哪里调用:

[HttpPost]
public ActionResult ValidationDemo(RegistrationData model)
{
    if (ModelState.IsValid)
    {
        return Redirect("/");
    }

    return View(model);
}

所有"开箱即用"验证都能正常运行,这只是我的自定义验证没有被调用.在进行调试时,我发现它是在调用构造函数时实例化的,但是在IsValid上设置的断点永远不会被命中.

发生了什么,我该如何解决？

UPDATE

好吧,我摆弄了一些,如果我在我的控制器中调用TryUpdateModel(模型),它最终会调用IsValid.所以这对我来说意味着我的自定义属性没有被"注册"任何运行MVC 2中的验证.有没有办法解决这个问题？

[HttpPost]
public ActionResult ValidationDemo(RegistrationData model)
{
    TryValidateModel(model);  // <--- *** Added this line and it "works"

    if (ModelState.IsValid)
    {
        return Redirect("/");
    }

    return View(model);
}

Answer 1

您是否尝试过填写所有其他字段以满足所有开箱即用的验证，并查看是否触发了您的自定义验证？如果客户端验证不满足，表单将被阻止回发，因此您的服务器端自定义验证将不会被触发，

要使自定义验证属性在客户端起作用，必须进行一些额外的工作。

在这里阅读 Phil 关于验证的优秀文章： http://haacked.com/archive/2009/11/19/aspnetmvc2-custom-validation.aspx