ASP.NET中MVC使用AJAX调用JsonResult方法并返回自定义错误信息(2)

时间:2014-11-15 11:36来源:网络整理作者:网络点击: 次

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默认情况下，如果AJAX请求发生了错误。它最多只知道错误码，而无法显示具体的错误信息。但报错通常是需要的，所以我们先要写一个过滤器，作用是一

默认情况下，如果AJAX请求发生了错误。它最多只知道错误码，而无法显示具体的错误信息。但报错通常是需要的，所以我们先要写一个过滤器，作用是一旦发生exception，就给返回的json中的data属性加一个errorMessage。并且，response的状态不能是200，不然ajax请求会以为没有发生错误。一般的服务器端错误代码是500。这个过滤器函数如下：

复制代码代码如下:

<span class="kwd">public<span class="pln"> <span class="kwd">class<span class="pln"> <span class="typ">JsonExceptionFilterAttribute<span class="pln"> <span class="pun">:<span class="pln"> <span class="typ">FilterAttribute<span class="pun">,<span class="pln"> <span class="typ">IExceptionFilter<span class="pln">

<span class="pun">{<span class="pln">

    <span class="kwd">public<span class="pln"> <span class="kwd">void<span class="pln"> <span class="typ">OnException<span class="pun">(<span class="typ">ExceptionContext<span class="pln"> filterContext<span class="pun">)<span class="pln">

    <span class="pun">{<span class="pln">

        <span class="kwd">if<span class="pln"> <span class="pun">(<span class="pln">filterContext<span class="pun">.<span class="typ">RequestContext<span class="pun">.<span class="typ">HttpContext<span class="pun">.<span class="typ">Request<span class="pun">.<span class="typ">IsAjaxRequest<span class="pun">())<span class="pln">

        <span class="pun">{<span class="pln">

            filterContext<span class="pun">.<span class="typ">HttpContext<span class="pun">.<span class="typ">Response<span class="pun">.<span class="typ">StatusCode<span class="pln"> <span class="pun">=<span class="pln"> <span class="lit">500<span class="pun">;<span class="pln">

            filterContext<span class="pun">.<span class="typ">ExceptionHandled<span class="pln"> <span class="pun">=<span class="pln"> <span class="kwd">true<span class="pun">;<span class="pln">

            filterContext<span class="pun">.<span class="typ">Result<span class="pln"> <span class="pun">=<span class="pln"> <span class="kwd">new<span class="pln"> <span class="typ">JsonResult<span class="pln">

            <span class="pun">{<span class="pln">

                <span class="typ">Data<span class="pln"> <span class="pun">=<span class="pln"> <span class="kwd">new<span class="pln">

                <span class="pun">{<span class="pln">

                    errorMessage <span class="pun">=<span class="pln"> filterContext<span class="pun">.<span class="typ">Exception<span class="pun">.<span class="typ">Message<span class="pln">

                <span class="pun">},<span class="pln">

                <span class="typ">JsonRequestBehavior<span class="pln"> <span class="pun">=<span class="pln"> <span class="typ">JsonRequestBehavior<span class="pun">.<span class="typ">AllowGet<span class="pln">

            <span class="pun">};<span class="pln">

        <span class="pun">}<span class="pln">

    <span class="pun">}<span class="pln">

<span class="pun">}</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>