MVC中使用RemoteAttribute异步远程验证

使用方法：

1。Model中增加Remote Attribute，并指定相应的验证Action路径

 public class UsingRemote
    {
         [Required]
           [Remote("IsNumberEven", "GuestBook", ErrorMessage = "数字必须是偶数!")]
           public int EvenNumber { get; set; }
    }

IsnumberEven为Action,GuestBook为Controller

2。Controller中创建相应验证方法：

     [HttpGet]
        public JsonResult IsNumberEven(int EvenNumber)
        {
            return Json(EvenNumber % 2 == 0, JsonRequestBehavior.AllowGet);
        }

注意：必须为[HttpGet],返回结果必须为Json

3.View中添加元素：

@using Mvc4Application.Models
@model UsingRemote
@{
    ViewBag.Title = "RemoteAttribute";
}
@{Html.EnableClientValidation(); Html.EnableUnobtrusiveJavaScript();}

<h2>RemoteAttribute</h2>
@using (Html.BeginForm("RemoteAttribute", "GuestBook"))
{
    @Html.EditorForModel()                             
    <button type="submit">submit</button>                          
}

注意：因为Remote实际为通过调用JQuery实现的异步远程调用，所以必须在_layout.cshtml中同时引用了如下三个文件：

   <script src="@Url.Content("~/Scripts/jquery-1.7.1.min.js")" 
               type="text/javascript"></script>
         <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>

且在该view中声明了：

@{Html.EnableClientValidation(); Html.EnableUnobtrusiveJavaScript();}

或在web.config中声明：

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