blocks|key|196647|text|++++public+ActionResult+Index()
++++{
++++++++var+browser+=+this.Request.Browser;
++++++++System.Diagnostics.Trace.WriteLine(browser.Browser);+//+InternetExplorer
++++++++System.Diagnostics.Trace.WriteLine(browser.MajorVersion);+//+11
++++++++return+View();
++++}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|196648|请注意，您需要安装有http://support.microsoft.com/kb/2836939/en-us的.NET+4.5或.NET+4.0才能正确检测IE11。|unstyled|offset|length|196649|entityMap|0|LINK|mutability|MUTABLE|url|http://support.microsoft.com/kb/2836939/en-us^0|0|A|19|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|R|8|@]|9|@$G|S|H|T|1|U]]|A|$]]|$1|I|3|-4|5|F|7|V|8|@]|9|@]|A|$]]]|J|$K|$5|L|M|N|A|$O|P]]]]

<pre><code> public ActionResult Index()
 {
 var browser = this.Request.Browser;
 System.Diagnostics.Trace.WriteLine(browser.Browser); // InternetExplorer
 System.Diagnostics.Trace.WriteLine(browser.MajorVersion); // 11
 return View();
 }
</code></pre>

Please note that you need .NET 4.5 or .NET 4.0 with <a href="http://support.microsoft.com/kb/2836939/en-us" rel="nofollow">http://support.microsoft.com/kb/2836939/en-us</a> installed to correctly detect IE11.

blocks|key|4702646|text|使用如下正则表达式：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4702647|Regex.IsMatch(this.Request.UserAgent,+@"Trident/7.*rv:11")|code-block|syntax|javascript|4702648|Trident是IE使用的渲染引擎的名称。正如您在Wikipedia文章中所看到的，其他一些应用程序也使用Trident引擎。但是在用户代理中搜索三叉树应该不是问题，因为没有其他主要浏览器使用三叉树。|offset|length|4702649|只有IE11使用三叉树版本7，所以如果您使用正则表达式搜索Trident/7，它应该会找到IE11。|style|CODE|4702650|entityMap|0|LINK|mutability|MUTABLE|url|http://en.wikipedia.org/wiki/Trident_%2528layout_engine%2529^0|0|0|0|7|0|0|T|9|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|X|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Y|8|@]|9|@$I|Z|J|10|1|11]]|A|$]]|$1|K|3|L|5|6|7|12|8|@$I|13|J|14|M|N]]|9|@]|A|$]]|$1|O|3|-4|5|6|7|15|8|@]|9|@]|A|$]]]|P|$Q|$5|R|S|T|A|$U|V]]]]

Use a Regular Expression like:

<pre><code>Regex.IsMatch(this.Request.UserAgent, @"Trident/7.*rv:11")
</code></pre>

<a href="http://en.wikipedia.org/wiki/Trident_%28layout_engine%29">Trident</a> is the name of the rendering engine IE uses. Some other applications also use the Trident engine, as you can see in the Wikipedia article. But it shouldn't be a problem to search for Trident in the User Agent, since no other major browsers use Trident.

Only IE11 uses Trident version 7 so if you search for <code>Trident/7</code> with the regex, it should find IE11.

blocks|key|4702709|text|我使用下面的Regex解决了这个问题，因为我使用了一个敲出系统来检查访问站点所使用的浏览器。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4702710|在这种情况下，即使检查了浏览器"IE“并返回false，我仍然继续使用这个正则表达式，并检查它是否与用户代理匹配：|4702711|(?:\b(MS)?IE\s%2B%7C\bTrident\/7\.0;.*\s%2Brv:)(\d%2B)|offset|length|style|CODE|4702712|我希望这对某些人有帮助。我对它进行了测试，运行良好。我还将rv更改为12或更高，如果在IE12中，他们将rv更改为12，它也可以很好地工作。|4702713|entityMap^0|0|0|0|1A|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|P|8|@$F|Q|G|R|H|I]]|9|@]|A|$]]|$1|J|3|K|5|6|7|S|8|@]|9|@]|A|$]]|$1|L|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|M|$]]

I solved this by using the Regex below after having a knock out system to check what browser is being used to access the site.

in this case, even if the browser "IE" is checked and returns false, I go ahead and use this regex and check to see if it is a match against the user agent:

<code>(?:\b(MS)?IE\s+|\bTrident\/7\.0;.*\s+rv:)(\d+)</code>

I hope this helps someone. I tested it and works fine. I also changed the rv to be 12 and upwards, and it works fine too in case if in IE12, they change rv to be 12.

blocks|key|196820|text|这听起来确实像是将浏览器列入白名单，但这不是一个好主意。一般来说，你真的需要做客户端的功能检测。MVC真的不知道它是什么浏览器，Request.Browser对象可以给你一些概念，但这并不是真正可靠的，IE11的情况就是这样。它告诉我在我的开发机器上是版本11，但在我的服务器上是7，这可能是一个灾难性的错误。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|196821|我构建了单页应用程序，并且采取了与Google类似的态度，只支持当前和以前版本的浏览器。当我检测到一个过时的浏览器时，我会服务于一个“核心”站点，它只是一些基本的CSS和标记，没有JavaScript。这样做更容易，让开发变得容易得多。|196822|无论如何，我检测的方法是测试IE的当前版本，如下所示：|196823|++++public+static+bool+IsModernIE()+{

++++++++return+HttpContext.Current.Request.Browser.Browser+==+"InternetExplorer";

++++}|code-block|syntax|javascript|196824|它是一种HTML辅助方法。所以在你的cshtml中，你可以使用测试。在我的控制器中，我调用单独的版本测试。这最终是一种非常脆弱的方式。我基本上是在现代IE+(10/11)和旧IE+(9-)之间划清界限。这个测试可能与下一个版本无关，我还没有对Xbox+One进行测试。|196825|我有一个我使用的库，发布在GitHub上。我现在称它为usable+Alpha，所以如果你愿意的话，就把它拿去运行吧。我想让测试更具外部可配置性，等等。下面是存储库https://github.com/docluv/SPAHelper的URL。我实际上在我的博客http://love2dev.com上使用它。|offset|length|196826|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/docluv/SPAHelper|1|http://love2dev.com/^0|0|0|0|0|0|2A|Z|0|3N|J|1|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|11|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|12|8|@]|9|@]|A|$]]|$1|F|3|G|5|H|7|13|8|@]|9|@]|A|$I|J]]|$1|K|3|L|5|6|7|14|8|@]|9|@]|A|$]]|$1|M|3|N|5|6|7|15|8|@]|9|@$O|16|P|17|1|18]|$O|19|P|1A|1|1B]]|A|$]]|$1|Q|3|-4|5|6|7|1C|8|@]|9|@]|A|$]]]|R|$S|$5|T|U|V|A|$W|X]]|Y|$5|T|U|V|A|$W|Z]]]]

It does sound like you are whitelisting browsers, which is not a good idea. You really need to do client-side detection of capabilities instead, generally. MVC really does not know what browser it is, the Request.Browser object can give you some idea, but that is not really reliable, which is the case for IE 11. It tells me version 11 on my dev machine, but 7 on my server, which can be a catastrophic mistake.

I build Single Page Applications and have adopted a similar attitude as Google about only supporting the current and previous version of a browser only. When I detect an outdated browser I server a 'core' site that is just some basic CSS and markup, no JavaScript. It is just easier that way, makes development so much easier.

Anyway the way I detect is to test for the current versions of IE like so:

<pre><code> public static bool IsModernIE() {

 return HttpContext.Current.Request.Browser.Browser == "InternetExplorer";

 }
</code></pre>

It is an HTML helper method. So in your cshtml you can use the test. In my controller I call the individual version tests. This is ultimately a very fragile way to do it. I am basically drawing a line in the sand between modern IE (10/11) and old IE (9-). This test could be irrelevant with the next version and I have not tested against say Xbox One yet.

I have a library I use, posted on GitHub. I would call it usable Alpha right now, so take it for that and run with it if you like. I want to make the tests more externally configurable, etc. here is the URL for the repository, <a href="https://github.com/docluv/SPAHelper" rel="nofollow">https://github.com/docluv/SPAHelper</a>. I actually use it on my Blog, <a href="http://love2dev.com" rel="nofollow">http://love2dev.com</a>.

We all know that IE11 detection does not work with server side languages because Microsoft has removed the IE/MSIE browser indication and now is fully "Mozilla".

I also know that doing browser detection/version is risky but has served us all well in the past. 

some requirements for a website are things like:

must work with certain version of firefox and above
must work with certain version of chrome and above
must work with certain version of safari's (some below and some newer)
must work with IE >= 8

so here is the problem... IE11 indicates on my list that it is not supported. I want to support it from the web side of things on the server (ASP.NET/MVC)

it is not clear exactly how to detect this from the server side. Does anyone know how?

this is the user agent now being shown in IE 11:

"Mozilla/5.0 (Windows NT 6.1; WOW64; Trident/7.0; rv:11.0) like Gecko"

rv:11.0 tells us its IE11 however doing a parse on that will still mean that for example, it could be chrome of a certain version that is not supported in such a requirement or even firefox.

so, what is the best way here to see if it is indeed IE 11 or higher? 

I am not so sure about searching from "Trident" and onwards because I don't know if other browsers use that or not.

any direction is welcomed.

Internet explorer 11 detection on server side

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我们都知道，IE11检测不适用于服务器端语言，因为微软已经删除了IE/MSIE浏览器指示，现在完全是"Mozilla“。我也知道做浏览器检测/版本是有风险的，但在过去我们都做得很好。对网站的一些要求是这样的：必须适用于某些版本的火狐和更高版本必须适用于某些版本的chrome和更高版本必须适用于某些版本的safari(以...

问Internet explorer 11在服务器端的检测
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