关于asp.net mvc 3：Ajax报告错误调用了MVC中的PartialView方法

Reporting errors from Ajax invoked PartialView methods in MVC

如果正常的页面加载错误，我可以通过Error视图和HandleErrorInfo模型向用户报告异常详细信息。

如果一个ajax调用预期有Json结果错误，我可以显式地处理错误并将详细信息传递给客户：

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public JsonResult Whatever()
{
try
{
DoSomething();
return Json(new { status ="OK" });
}
catch (Exception e)
{
return Json(new { status ="Error", message = e.Message });
}
}

所以，我的问题是，我看不到任何方法来报告从Ajax调用到返回部分视图的操作的错误详细信息。

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$.ajax({
url: 'whatever/trevor',
error: function (jqXHR, status, error) {
alert('An error occured: ' + error);
},
success: function (html) {
$container.html(html);
}
});

这只会报告一个HTTP错误代码(例如，内部服务器错误)，这对客户端没有帮助。是否有一些巧妙的技巧来传递成功的partialview(html)结果或错误消息？

从ViewResult显式地评估HTML，并将其作为Json对象的一部分返回，同时返回一个状态似乎太难闻了。是否有处理此方案的既定模式？

控制器的动作：

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public ActionResult Foo()
{
// Obviously DoSomething could throw but if we start
// trying and catching on every single thing that could throw
// our controller actions will resemble some horrible plumbing code more
// than what they normally should resemble: a.k.a being slim and focus on
// what really matters which is fetch a model and pass to the view

// Here you could return any type of view you like: JSON, HTML, XML, CSV, PDF, ...

var model = DoSomething();
return PartialView(model);
}

然后我们定义全局错误处理程序，我们的应用：

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protected void Application_Error(object sender, EventArgs e)
{
var exception = Server.GetLastError();
var httpException = exception as HttpException;
Response.Clear();
Server.ClearError();

if (new HttpRequestWrapper(Request).IsAjaxRequest())
{
// Some error occurred during the execution of the request and
// the client made an AJAX request so let's return the error
// message as a JSON object but we could really return any JSON structure
// we would like here

Response.StatusCode = 500;
Response.ContentType ="application/json";
Response.Write(new JavaScriptSerializer().Serialize(new
{
errorMessage = exception.Message
}));
return;
}

// Here we do standard error handling as shown in this answer:
// http://stackoverflow.com/q/5229581/29407

var routeData = new RouteData();
routeData.Values["controller"] ="Errors";
routeData.Values["action"] ="General";
routeData.Values["exception"] = exception;
Response.StatusCode = 500;
if (httpException != null)
{
Response.StatusCode = httpException.GetHttpCode();
switch (Response.StatusCode)
{
case 404:
routeData.Values["action"] ="Http404";
break;
case 500:
routeData.Values["action"] ="Http500";
break;
}
}

IController errorsController = new ErrorsController();
var rc = new RequestContext(new HttpContextWrapper(Context), routeData);
errorsController.Execute(rc);
}

这里的如何使用错误处理程序在全球errorscontroller可能看起来像。也许我们可以定义一些自定义视图的404和500的行动：

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public class ErrorsController : Controller
{
public ActionResult Http404()
{
return Content("Oops 404");
}

public ActionResult Http500()
{
return Content("500, something very bad happened");
}
}

然后我们可以订阅一个全局错误处理程序的错误，这样我们所有的Ajax不重复的错误处理代码在所有Ajax请求，但如果我们想要我们可以重复它：

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$('body').ajaxError(function (evt, jqXHR) {
var error = $.parseJSON(jqXHR.responseText);
alert('An error occured: ' + error.errorMessage);
});

我们终于和火灾在AJAX请求到控制器的动作，我们希望将返回HTML的偏在这个案例：

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$.ajax({
url: 'whatever/trevor',
success: function (html) {
$container.html(html);
}
});