blocks|key|240628|text|您可以创建自己的扩展方法，就像MVC+code中的扩展方法一样|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|240629|例如。|240630|public+static+bool+IsAjaxRequest(this+HttpRequest+request)
{
++++if+(request+==+null)
++++{
++++++++throw+new+ArgumentNullException("request");
++++}

++++return+(request["X-Requested-With"]+==+"XMLHttpRequest")+%7C%7C+((request.Headers+!=+null)+&&+(request.Headers["X-Requested-With"]+==+"XMLHttpRequest"));
}|code-block|syntax|javascript|240631|HTHs，|240632|查尔斯|240633|ajax编辑：实际上回调请求也是请求，|style|BOLD|240634|++++public+static+bool+IsAjaxRequest(this+HttpRequest+request)
++++{
++++++++if+(request+==+null)
++++++++{
++++++++++++throw+new+ArgumentNullException("request");
++++++++}
++++++++var+context+=+HttpContext.Current;
++++++++var+isCallbackRequest+=+false;//+callback+requests+are+ajax+requests
++++++++if+(context+!=+null+&&+context.CurrentHandler+!=+null+&&+context.CurrentHandler+is+System.Web.UI.Page)
++++++++{
++++++++++++isCallbackRequest+=+((System.Web.UI.Page)context.CurrentHandler).IsCallback;
++++++++}
++++++++return+isCallbackRequest+%7C%7C+(request["X-Requested-With"]+==+"XMLHttpRequest")+%7C%7C+(request.Headers["X-Requested-With"]+==+"XMLHttpRequest");
++++}|240635|entityMap|0|LINK|mutability|MUTABLE|url|http://aspnet.codeplex.com/SourceControl/changeset/view/60098#338547^0|F|8|0|0|0|0|0|0|G|3|0|0^^$0|@$1|2|3|4|5|6|7|12|8|@]|9|@$A|13|B|14|1|15]]|C|$]]|$1|D|3|E|5|6|7|16|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|17|8|@]|9|@]|C|$I|J]]|$1|K|3|L|5|6|7|18|8|@]|9|@]|C|$]]|$1|M|3|N|5|6|7|19|8|@]|9|@]|C|$]]|$1|O|3|P|5|6|7|1A|8|@$A|1B|B|1C|Q|R]]|9|@]|C|$]]|$1|S|3|T|5|H|7|1D|8|@]|9|@]|C|$I|J]]|$1|U|3|-4|5|6|7|1E|8|@]|9|@]|C|$]]]|V|$W|$5|X|Y|Z|C|$10|11]]]]

You could create your own extension method much like the one in the <a href="http://aspnet.codeplex.com/SourceControl/changeset/view/60098#338547" rel="noreferrer">MVC code</a>

E.g.

<pre><code>public static bool IsAjaxRequest(this HttpRequest request)
{
 if (request == null)
 {
 throw new ArgumentNullException("request");
 }

 return (request["X-Requested-With"] == "XMLHttpRequest") || ((request.Headers != null) &amp;&amp; (request.Headers["X-Requested-With"] == "XMLHttpRequest"));
}
</code></pre>

HTHs, 
Charles

Edit: Actually Callback requests are also ajax requests,

<pre><code> public static bool IsAjaxRequest(this HttpRequest request)
 {
 if (request == null)
 {
 throw new ArgumentNullException("request");
 }
 var context = HttpContext.Current;
 var isCallbackRequest = false;// callback requests are ajax requests
 if (context != null &amp;&amp; context.CurrentHandler != null &amp;&amp; context.CurrentHandler is System.Web.UI.Page)
 {
 isCallbackRequest = ((System.Web.UI.Page)context.CurrentHandler).IsCallback;
 }
 return isCallbackRequest || (request["X-Requested-With"] == "XMLHttpRequest") || (request.Headers["X-Requested-With"] == "XMLHttpRequest");
 }
</code></pre>

blocks|key|2308358|text|尝试检查ScriptManager+IsInAsyncPostBack：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|2308359|ScriptManager.GetCurrent(Page).IsInAsyncPostBack|code-block|syntax|javascript|2308360|entityMap|0|LINK|mutability|MUTABLE|url|http://msdn.microsoft.com/en-us/library/system.web.ui.scriptmanager.isinasyncpostback.aspx^0|I|H|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

Try to check if the ScriptManager <a href="http://msdn.microsoft.com/en-us/library/system.web.ui.scriptmanager.isinasyncpostback.aspx" rel="nofollow">IsInAsyncPostBack</a> :

<pre><code>ScriptManager.GetCurrent(Page).IsInAsyncPostBack
</code></pre>

blocks|key|240540|text|通常，您将需要测试X-Requested-With头，确保它的值为“XMLHttpRequest”。我(目前)还不是C#开发人员，但在谷歌上快速搜索会发现在C#中是这样的：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|240541|Request.Headers["X-Requested-With"]+==+"XMLHttpRequest";|code-block|syntax|javascript|240542|entityMap^0|9|G|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

Generally, you will need to test for the <code>X-Requested-With</code> header, ensuring that its value is 'XMLHttpRequest'. I'm not a C# developer (yet), but a quick google search says that in C# it goes something like this:

<pre><code>Request.Headers["X-Requested-With"] == "XMLHttpRequest";
</code></pre>

blocks|key|2308392|text|是的，Request.IsAjaxRequest查看X-Requested-With的标头和查询字符串，但似乎您的jquery并没有发送X-Requested-With标头。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2308393|您可以尝试使用Fiddler查看它正在发送的标头，或者通过将POST+url设置为|2308394|/whatever.aspx?x-requested-with=XMLHttpRequest|2308395|entityMap^0|3|L|Q|G|1W|G|0|0|0|1A|0^^$0|@$1|2|3|4|5|6|7|L|8|@$9|M|A|N|B|C]|$9|O|A|P|B|C]|$9|Q|A|R|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|S|8|@]|D|@]|E|$]]|$1|H|3|I|5|6|7|T|8|@$9|U|A|V|B|C]]|D|@]|E|$]]|$1|J|3|-4|5|6|7|W|8|@]|D|@]|E|$]]]|K|$]]

Yes, <code>Request.IsAjaxRequest</code> looks at the headers and the querystring for <code>X-Requested-With</code>, but it seems your jquery isn't sending the <code>X-Requested-With</code> header.

You can try and see what headers it is sending by using Fiddler, or alternatively just send it in the querystring by setting the POST url to 

<code>/whatever.aspx?x-requested-with=XMLHttpRequest</code>

blocks|key|3905066|text|我创建了一个我使用的扩展：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3905067|internal+static+bool+IsAjaxRequest(this+HttpRequestMessage+request)
{
++++return+request+!=+null+&&+request.Headers.Any(h+=>+h.Key.Equals("X-Requested-With",+StringComparison.CurrentCultureIgnoreCase)+&&
++++++++h.Value.Any(v+=>+v.Equals("XMLHttpRequest",+StringComparison.CurrentCultureIgnoreCase)));
}|code-block|syntax|javascript|3905068|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

I created an extension that I use:

<pre><code>internal static bool IsAjaxRequest(this HttpRequestMessage request)
{
 return request != null &amp;&amp; request.Headers.Any(h =&gt; h.Key.Equals("X-Requested-With", StringComparison.CurrentCultureIgnoreCase) &amp;&amp;
 h.Value.Any(v =&gt; v.Equals("XMLHttpRequest", StringComparison.CurrentCultureIgnoreCase)));
}
</code></pre>

blocks|key|240665|text|使用[WebMethod(EnableSession+=+true)]语法装饰您的类，例如，如果您在后台代码中编写以下函数，并从ajax调用中调用相同的函数，您将会确信。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|240666|[WebMethod(EnableSession+=+true)]
++++public+static+void+++getData(string+JSONFirstData,string+JSONSecondData,+string+JSONThirdData,+string+JSONForthData,+...)
++++{
+++++++//code
++++}|code-block|syntax|javascript|240667|在Ajax+URL中，类似于URL+:'/Codebehind.aspx/getData'|240668|entityMap^0|2|X|0|0|E|V|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|S|8|@$9|T|A|U|B|C]]|D|@]|E|$]]|$1|M|3|-4|5|6|7|V|8|@]|D|@]|E|$]]]|N|$]]

Decorate your class with <code>[WebMethod(EnableSession = true)]</code>syntax like if you write the following function in code behind and call the same function from ajax call you will be sure.

<pre><code>[WebMethod(EnableSession = true)]
 public static void getData(string JSONFirstData,string JSONSecondData, string JSONThirdData, string JSONForthData, ...)
 {
 //code
 }
</code></pre>

in Ajax URL be like <code>URL :'/Codebehind.aspx/getData'</code>

I tried the <code>Request.IsAjaxRequest</code> but this does not exist in WebForms. I am making a JQuery ajax call. How do I check if this is a ajax request or not in C#?

How to check if request is ajax or not in codebehind - ASP.NET Webforms

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我尝试过Request.IsAjaxRequest，但在WebForms中不存在。我正在进行JQuery ajax调用。如何在C#中检查这是否是ajax请求？

问如何检查请求是否为ajax代码- ASP.NET Webforms
EN

回答 6

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问如何检查请求是否为ajax代码- ASP.NET WebformsEN

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