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,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);
}