ASP.NET MVC3远程验证不会输出错误消息

问题描述

| 我有一个简单的模型，默认为

RegisterModel

，在基于该模型为

Create

创建View时，我最终得到了

public class RegisterModel
{
    [required]
    [Remote(\"UserNameExists\",\"Account\",\"\",ErrorMessage = \"Username is already taken.\")]
    [display(Name = \"Username (spaces will be stripped,must be at least 6 characters long)\")]
    public string UserName { get; set; }

    [required]
    [Editable(true)]
    [display(Name = \"First and Last name\")]
    public string Name { get; set; }

    [required]
    [DataType(DataType.EmailAddress,ErrorMessage = \"You need to enter a valid email\")]
    [Remote(\"EmailExists\",ErrorMessage = \"Email is already taken.\")]
    [display(Name = \"Email address\")]
    public string Email { get; set; }

    //[required]
    //[ValidatePasswordLength]
    [DataType(DataType.Password)]
    [display(Name = \"Create a password\")]
    public string Password { get; set; }

    [DataType(DataType.Password)]
    [display(Name = \"Verify password\")]
    //[Compare(\"Password\",ErrorMessage = \"Password\'s do not match.\")]
    public string ConfirmPassword { get; set; }
}

并在视图中：

<h3>
    Details</h3>
@using (Html.BeginForm(\"GenerateBetaLink\",FormMethod.Post,new { @id = \"beta-user\" }))
{
    @Html.ValidationSummary(true)
    <div>
        <div class=\"editor-label\">
            @Html.LabelFor(model => model.UserName)
        </div>
        <div class=\"editor-field\">
            @Html.EditorFor(model => model.UserName) 
            @Html.ValidationMessageFor(model => model.UserName)
        </div>
        <div class=\"editor-label\">
            @Html.LabelFor(model => model.Name)
        </div>
        <div class=\"editor-field\">
            @Html.EditorFor(model => model.Name) 
            @Html.ValidationMessageFor(model => model.Name)
        </div>
        <div class=\"editor-label\">
            @Html.LabelFor(model => model.Email)
        </div>
        <div class=\"editor-field\">
            @Html.EditorFor(model => model.Email) 
            @Html.ValidationMessageFor(model => model.Email)
        </div>
        <p>
            &nbsp;</p>
        <p>
            <input type=\"submit\" value=\"Create Beta User\" class=\"btn-submit\" />
            <span class=\"loading\"></span>
        </p>
    </div>
}

我的

Validation Controller

public class ValidationController : Controller
{
    public JsonResult UserNameExists(string UserName)
    {
        OnlineservicesRepository db = new OnlineservicesRepository();

        var user = db.FindUserByUsername(UserName.Trim());
        return user == null ?
            Json(true,JsonRequestBehavior.AllowGet) :
            Json(string.Format(\"{0} is not available.\",UserName),JsonRequestBehavior.AllowGet);
    }

    public JsonResult EmailExists(string Email)
    {
        OnlineservicesRepository db = new OnlineservicesRepository();

        var user = db.FindUserByEmail(Email.Trim());
        return user != null ?
            Json(true,Email),JsonRequestBehavior.AllowGet);
    }
}

我的问题是，远程验证确实会触发，但没有按应有的方式向错误消息中写入任何内容，此外，jQuery方法

.valid()

一直告诉我该表单有效： （来源：balexandre.com） 我在这里想念什么？ MSDN文章显示了相同的代码（在可下载文件中）

解决方法

以下对我来说很好： 模型：

public class RegisterModel
{
    [Required]
    [DataType(DataType.EmailAddress,ErrorMessage = \"You need to enter a valid email\")]
    [Remote(\"EmailExists\",\"Home\",\"\")]
    [Display(Name = \"Email address\")]
    public string Email { get; set; }
}

控制器：

public class HomeController : Controller
{
    public ActionResult Index()
    {
        return View();
    }

    [HttpPost]
    public ActionResult Index(RegisterModel model)
    {
        return View(model);
    }

    public ActionResult EmailExists(string email)
    {
        if ((email ?? string.Empty).Contains(\"foo\"))
        {
            return Json(email + \" is not available\",JsonRequestBehavior.AllowGet);
        }

        return Json(true,JsonRequestBehavior.AllowGet);
    }
}

视图：

@model RegisterModel

<script src=\"@Url.Content(\"~/Scripts/jquery.validate.js\")\" type=\"text/javascript\"></script>
<script src=\"@Url.Content(\"~/Scripts/jquery.validate.unobtrusive.js\")\" type=\"text/javascript\"></script>

@using (Html.BeginForm())
{
    @Html.LabelFor(model => model.Email)
    @Html.EditorFor(model => model.Email) 
    @Html.ValidationMessageFor(model => model.Email)
    <input type=\"submit\" value=\"OK\" />
}

,我遇到了同样的问题，并通过更新到最新的jQuery（1.6）和jQuery.validate（1.8）库解决了它。获得这些的最简单方法是在NuGet中搜索jQuery。