asp.net-mvc-4 – ASP.NET MVC RemoteAttribute验证无效 – 操作

我在项目范围的web.config中启用了设置：

<add key="ClientValidationEnabled" value="true" />
<add key="UnobtrusiveJavaScriptEnabled" value="true" />

我有以下控制器：

[OutputCache(Location = OutputCacheLocation.None,NoStore = true)]
public class ValidationController : Controller
{
    private readonly IUserRepository userRepository;

    public ValidationController(IUserRepository userRepository)
    {
        this.userRepository = userRepository;
    }

    public JsonResult IsUserNameAvailable(string username)
    {
        User user = userRepository.Get(u => u.UserName == username);

        if (user == null) return Json(true,JsonRequestBehavior.AllowGet);
        else return Json(false,JsonRequestBehavior.AllowGet);
    }
}

和以下viewmodel：

[Required(ErrorMessage = "Required *")]
    [StringLength(50,MinimumLength = 4,ErrorMessage = "Please keep the username between four and twenty character.")]
    [Remote("IsUserNameAvailable","Validation",ErrorMessage = "A user with this username already exists.")]
    [Display(Name = "Username")]
    public string UserName { get; set; }

我的表格中有以下字段：

<form id="registerForm">
     ...
     @Html.ValidationMessageFor(m => m.UserName)
     @Html.TextBoxFor(m => m.UserName)
     @Html.LabelFor(m => m.UserName)
</form>

我做了ajax表单提交,并且已经完美地完成了服务器端验证：

$.post("/Account/Register",$('#registerForm').serialize(),function(){
   updateFormWithServerGeneratedErrors();
})

虽然服务器为我的字段生成了正确的输入标记：

<input ... data-val-remote-url="/Validation/IsUserNameAvailable" data-val-remote-additionalfields="*.UserName" data-val-remote="A user with this username already exists." ... >

我可以通过在url中输入来手动点击我的操作：“/ Validation / IsUserNameAvailable？username = SomeName”但是Fiddler没有在按键或焦点更改上显示对此URL的任何请求.

根据this tutorial我不需要编写任何javascript来使这个工作.是的,我开始修改表单时已经加载了jquery.validate.js和jquery.validate.unobtrusive.js脚本.

这里有什么问题？