我正在尝试在我正在编写的ASP.NET MVC 3应用程序上实现电话号码的自定义验证器。我已经了解了自定义验证器的代码,如下所示
public class PhoneNumberValidator : ValidationAttribute
{
public PhoneNumberValidator() : base("The Phone Number is not Valid")
{
}
public override bool IsValid(object value)
{
if (value != null)
{
string phonenumber = value.ToString();
var regex = new Regex(@"^(?:[0-9]+(?:-[0-9])?)*$");
if (regex.IsMatch(phonenumber))
{
return true;
}
else
{
return false;
}
}
return false;
}
}
然后在我的Model类中,我有以下内容:
[Display(Name = "PhoneNumber")]
[Required(ErrorMessage = "Is Phone Number Required")]
[PhoneNumberValidator]
public string PhoneNumber { get; set; }
然而,当我运行我的应用程序并单击页面上的继续按钮时,如果输入的值是字母,则不会抛出错误,但如果我设置了断点,我可以看到该值正在读入字符串phonenumber ok。我错过了一些简单的东西吗?
答案 0 :(得分:3)
你似乎正在重新发明轮子。为什么不使用现有的正则表达式验证器:
public class MyViewModel
{
[Display(Name = "PhoneNumber")]
[Required(ErrorMessage = "Is Phone Number Required")]
[RegularExpression(@"^(?:[0-9]+(?:-[0-9])?)*$")]
public string PhoneNumber { get; set; }
}
这就是说验证由模型绑定器触发,因此请确保您提交表单的控制器操作将视图模型作为参数:
[HttpPost]
public ActionResult Process(MyViewModel model)
{
if (!ModelState.IsValid)
{
// the model is invalid => redisplay view
return View(model);
}
// at this stage the model is valid => you could do some processing here
// and redirect
...
}
或使用TryUpdateModel
方法(我个人更喜欢以前的方法):
[HttpPost]
public ActionResult Process(FormCollection some_Dummy_Parameter_Thats_Not_Used_At_All_But_Which_We_Need_To_Avoid_The_Method_Overloading_Error_With_The_GET_Action_Which_Has_The_Same_Name)
{
var model = new MyViewModel();
if (!TryUpdateModel(model))
{
// the model is invalid => redisplay view
return View(model);
}
// at this stage the model is valid => you could do some processing here
// and redirect
...
}
另外,为了在某处显示错误消息,请确保在视图中有相应的占位符:
@Html.EditorFor(x => x.PhoneNumber)
@Html.ValidationMessageFor(x => x.PhoneNumber)
或使用验证摘要助手:
@Html.ValidationSummary(false)