不一致的属性名在外壳产生JsonResult [英] Inconsistent property name casing in generated JsonResult

问题描述

我一直在抓我的头在这一段时间，并已决定让SO社会采取裂纹吧...

I've been scratching my head on this for a while now and have decided to let the SO community take a crack at it...

我有一个从客户端是做简单的任务，并返回回复帖子的几个动作 JsonResult 从一个匿名类建有一个简单的布尔成功的属性如果成功，或返回 PartialViewResult 与的ModelState 错误，如果行动失败：

I have a few actions that respond to POSTs from the client side that do simple tasks and return a JsonResult built from an anonymous class with a simple Boolean "Success" property if it succeeds, or returns a PartialViewResult with ModelState errors if the action was unsuccessful:

<HttpPost()> _
Public Function UpdateHeader(ByVal header As XmlReturnHeader) As ActionResult
    If ModelState.IsValid Then
        Dim updated As Integer = TaxRepository.XmlReturnHeader.Update(header)
        If updated = 1 Then
            Return Json(New With {.Success = True}, JsonRequestBehavior.AllowGet)
        End If
    End If
    Return PartialView("Maintenance/Header", header)
End Function

在客户端中，code是同样简单。我想看看结果有一个成功属性，确保它是真的真正键，然后再从那里

On the client side, the code is equally as simple. I want to see if the result has a Success property, make sure that it was really true and then go from there:

$.post('<%= Url.Action("UpdateHeader") %>', $(this).serialize(), function (data) {
    if (data.Success && data.Success === true) {
        $('#list').trigger('reloadGrid');
        $('#edit').dialog('close');
    } else { // result must be the HTML
        $('#edit').html(data);
    }
});

不过，我遇到了问题测试。在数据对象，我从回调函数接收总是看起来是这样的：

However, I ran into issues testing. The data object I receive from the callback function always looks like this:

{ success: true }
  ^

的取值在成功是小写的，因为JS是区分大小写的，我有一个问题

The s in success is lower-case, and because JS is case-sensitive, I have a problem.

奇怪的部分是，如果我改变VB.NET code到

The strange part is if I change the VB.NET code to

Return Json(New With {.Garbage = True}, JsonRequestBehavior.AllowGet),

我将获得

{ Garbage: true } 

如果我改回新增功能{.Success = TRUE} ，我再次看到了小写取值。

If I change it back to New With { .Success = True }, I again see the lower-case s.

我使用IIS和IE9测试。我觉得自己的反应是莫名其妙地被缓存。有应用程序的其他地方，我用的是小写的成功作为属性在一个匿名 JsonResult 参数。也许是IIS缓存从previous响应GET或POST请求？

I am using IIS and IE9 for testing. I feel like the response is somehow being cached. There are other places in the application where I use a lower-case "success" as a property in an anonymous JsonResult parameter. Perhaps IIS is caching a response from a previous GET or POST request?

[更新]

要测试的响应缓存理论，我改变了我的code为：

To test the response caching theory, I changed my code to:

Return Json(New With {.Success = True, .Random = DateTime.Now.Ticks},
   JsonRequestBehavior.AllowGet)

此导致要在客户端接收到的正确的响应。大。但到底是怎么回事之前？我以为职位免于缓存？或者是，只有请求和响应不？

This caused the correct response to be received on the client side. Great. But what the heck was going on before? I thought POSTs were exempt from caching? Or is that only requests and not Responses?

我怎样才能在未来避免这种情况？

How can I avoid this in the future?

[更新]

另外一个珍闻：我不关闭全局通过jQuery缓存我的要求，但我没有任何 OutputCacheAttribute s或对雇用任何这样的无缓存机制服务器端。我quicky耳光＆LT;的OutputCache（NoStore：= TRUE，持续时间：= 0，VaryByParam时：=*）＆GT; 整个控制器上，去掉了 .Random 从JSON财产，但仍然收到 {成功：真正} 。

One other tidbit: I do globally disable caching my requests via jQuery, but I do not have any OutputCacheAttributes or any such "no-cache" mechanism employed on the server side. I quicky slapped <OutputCache(NoStore:=True, Duration:=0, VaryByParam:="*")> on the entire controller, removed the .Random property from the JSON, but still received { success: true }.

我已经走得很远，回收应用程序池，删除临时文件.NET和清除浏览器缓存，同样的问题仍然存在。

I have go so far as to recycle application pools, remove Temporary .NET Files, and clear browser cache, and the same problem persists.

推荐答案

如果您还没有看到它，你可能要看一看在输出缓存下面的文章在ASP.net MVC：的 http://juristr.com/blog/2012/10/output-caching-in -aspnet-MVC /

If you haven't seen it, you may want to take a look at the following article on Output Caching in ASP.net MVC: http://juristr.com/blog/2012/10/output-caching-in-aspnet-mvc/

根据这篇文章，默认响应头包括：

According to the article, the default response headers include:

Cache-Control:private

这意味着IE的可以的缓存在私有缓存的响应。本文提供了三个选项禁用缓存这些请求：禁止全局在服务器上（我不建议客户端性能的原因），编写定制的全球行动过滤器（具有相同效果），或添加属性叫你的控制器动作的OutputCache：

Which means that IE can cache the response in a private cache. The article offers three options for disabling caching of these requests: disabling it globally on the server (which I don't recommend for client performance reasons), writing a custom global action filter (which has the same result), or adding an attribute to your controller action called OutputCache:

<OutputCache(Duration:=0)>

虽然jQuery的设置应执行类似的功能，它可能无法争取同样的结果。试试这个，看看它是否工作。

While the jQuery setting should perform a similar function, it may not garner the same result. Try this and see if it works.

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