blocks|key|1549580|text|由于Comet的持久连接性，使用IIS扩展Comet很有挑战性，但现在有一个团队正在研究Comet的场景。另外看看Aaron+Lerch's+blog，因为我相信他在ASP.NET中做过一些Comet的早期工作。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1549581|entityMap|0|LINK|mutability|MUTABLE|url|http://www.aaronlerch.com/blog/2007/07/08/creating-comet-applications-with-aspnet/^0|1L|I|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

Comet is challenging to scale with IIS because of comet's persistent connectivity, but there is a team looking at Comet scenarios now. Also look at <a href="http://www.aaronlerch.com/blog/2007/07/08/creating-comet-applications-with-aspnet/" rel="noreferrer">Aaron Lerch's blog</a> as I believe he's done some early Comet work in ASP.NET.

blocks|key|1549790|text|我最近用基于great+article+by+Clay+Lenhart的MVC3异步控制器写了一个simple+example+of+a+Long+Polling+Chat+Server|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1549791|您可以使用我根据BitBucket项目的源代码设置的example+on+a+AppHarbor+deployment。|1549792|此外，my+blog+post+explaining+the+project还提供了更多信息。|1549793|entityMap|0|LINK|mutability|MUTABLE|url|http://clay.lenharts.net/blog/2010/10/19/websockets-is-cool-but-what-can-you-do-today/|1|https://bitbucket.org/jacob4u2/mvcchatsite/src|2|http://mvcchatsite.apphb.com/|3|http://jacob4u2.posterous.com/mvc-3-long-polling-comet-chat-example^0|6|T|0|1D|18|1|0|Q|X|2|0|6|W|3|0^^$0|@$1|2|3|4|5|6|7|V|8|@]|9|@$A|W|B|X|1|Y]|$A|Z|B|10|1|11]]|C|$]]|$1|D|3|E|5|6|7|12|8|@]|9|@$A|13|B|14|1|15]]|C|$]]|$1|F|3|G|5|6|7|16|8|@]|9|@$A|17|B|18|1|19]]|C|$]]|$1|H|3|-4|5|6|7|1A|8|@]|9|@]|C|$]]]|I|$J|$5|K|L|M|C|$N|O]]|P|$5|K|L|M|C|$N|Q]]|R|$5|K|L|M|C|$N|S]]|T|$5|K|L|M|C|$N|U]]]]

I recently wrote a <a href="https://bitbucket.org/jacob4u2/mvcchatsite/src" rel="noreferrer" title="MVC Chat Site Source On BitBucket">simple example of a Long Polling Chat Server</a> using MVC 3 Async Controllers based on a <a href="http://clay.lenharts.net/blog/2010/10/19/websockets-is-cool-but-what-can-you-do-today/" rel="noreferrer">great article by Clay Lenhart</a>

You can use the <a href="http://mvcchatsite.apphb.com" rel="noreferrer">example on a AppHarbor deployment</a> I set up based on the source from the BitBucket project.

Also, more information available from my <a href="http://jacob4u2.posterous.com/mvc-3-long-polling-comet-chat-example" rel="noreferrer">blog post explaining the project</a>.

blocks|key|1549640|text|您还可以看看Kaazing+Enterprise+Gateway，它发布了webSocket+HTML5网关的生产版本，完全取代了comet的方式，并支持浏览器和应用服务器之间的全双工连接。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1549641|您还可以查看Light+Streamer+Demos|1549642|entityMap|0|LINK|mutability|MUTABLE|url|https://kaazing.com/products/websocket-gateway/editions/|1|http://www.lightstreamer.com/demos.htm^0|6|Q|0|0|6|K|1|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@$A|Q|B|R|1|S]]|C|$]]|$1|D|3|E|5|6|7|T|8|@]|9|@$A|U|B|V|1|W]]|C|$]]|$1|F|3|-4|5|6|7|X|8|@]|9|@]|C|$]]]|G|$H|$5|I|J|K|C|$L|M]]|N|$5|I|J|K|C|$L|O]]]]

You might also look at the <a href="https://kaazing.com/products/websocket-gateway/editions/" rel="nofollow noreferrer">Kaazing Enterprise Gateway</a> which has made a production release of their webSocket [HTML5] gateway which supersedes the comet way completely and enables full-duplex connections between browsers &amp; application servers.

You might also look at <a href="http://www.lightstreamer.com/demos.htm" rel="nofollow noreferrer">Light Streamer Demos</a>

blocks|key|1549723|text|我很久以前用过一个聊天网站，它使用了一个定制的http流媒体服务器。实际上，出于好奇心，我一度复制了这个软件，我认为这很容易做到。我永远不会尝试在IIS中实现类似类型的“无限请求”，特别是在ASP.NET中，因为这些请求会无限期地占用线程池线程(如果使用异步处理程序，则为IO线程)，这意味着在线程池配置允许的情况下，每个服务器只能处理那么多。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1549724|如果我对这些功能有强烈的合法需求，老实说，我会为它编写一个自定义的http服务器。|1549725|我知道这并没有真正回答你的问题，但我认为输入可能是相关的。|1549726|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

I once used a chat site long ago that utilized a custom built http streaming server. I actually reproduced that software at one point out of sheer curiosity, and it's easy enough to do, I think. I would never try to implement a similar type of "infinite request" in IIS, especially in ASP.NET, because the requests tie up a thread pool thread (or IO thread, if asynchronous handlers are used) indefinitely, which means you can only handle so much per server as your thread pool configuration allows.

If I had a strong legitimate need for such functionality, I'd honestly write a custom http server for it.

I know that doesn't really answer your question, but I thought the input might be relevant.

blocks|key|1549842|text|WS-I小组发布了一个名为"Reliable+Secure+Profile"的东西，它有一个Glass+Fish和.NET+implementation，显然inter-operate很好。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1549843|如果幸运的话，也有一个Javascript实现。|1549844|还有一个使用HTTP+Duplex.的Silverlight实现，当发生推送时，您可以使用connect+javascript+to+the+Silverlight对象来获取回调。|1549845|也有commercial+paid+versions。|1549846|entityMap|0|LINK|mutability|MUTABLE|url|http://www.ws-i.org/deliverables/workinggroup.aspx?wg=reliablesecure|1|http://msdn.microsoft.com/en-us/library/ee818238.aspx|2|http://msdn.microsoft.com/en-us/library/ff842400.aspx#requestResponse|3|https://stackoverflow.com/questions/5724558/is-there-a-javascript-implementation-for-ws-i-reliable-secure-profile|4|http://msdn.microsoft.com/en-us/library/cc645027%2528v=vs.95%2529.aspx|5|https://stackoverflow.com/questions/5449642/http-push-comet-reverse-ajaxusing-silverlight-to-javascript-bridge|6|https://stackoverflow.com/questions/5427681/how-do-modern-implementations-of-comet-reverse-ajax-work-any-stable-c-wcf-or-as^0|D|P|0|1L|J|1|27|D|2|0|B|A|3|0|6|C|4|19|11|5|0|2|O|6|0^^$0|@$1|2|3|4|5|6|7|13|8|@]|9|@$A|14|B|15|1|16]|$A|17|B|18|1|19]|$A|1A|B|1B|1|1C]]|C|$]]|$1|D|3|E|5|6|7|1D|8|@]|9|@$A|1E|B|1F|1|1G]]|C|$]]|$1|F|3|G|5|6|7|1H|8|@]|9|@$A|1I|B|1J|1|1K]|$A|1L|B|1M|1|1N]]|C|$]]|$1|H|3|I|5|6|7|1O|8|@]|9|@$A|1P|B|1Q|1|1R]]|C|$]]|$1|J|3|-4|5|6|7|1S|8|@]|9|@]|C|$]]]|K|$L|$5|M|N|O|C|$P|Q]]|R|$5|M|N|O|C|$P|S]]|T|$5|M|N|O|C|$P|U]]|V|$5|M|N|O|C|$P|W]]|X|$5|M|N|O|C|$P|Y]]|Z|$5|M|N|O|C|$P|10]]|11|$5|M|N|O|C|$P|12]]]]

The WS-I group published something called <a href="http://www.ws-i.org/deliverables/workinggroup.aspx?wg=reliablesecure" rel="nofollow noreferrer">"Reliable Secure Profile"</a> that has a Glass Fish and <a href="http://msdn.microsoft.com/en-us/library/ee818238.aspx" rel="nofollow noreferrer">.NET implementation</a> that apparently <a href="http://msdn.microsoft.com/en-us/library/ff842400.aspx#requestResponse" rel="nofollow noreferrer">inter-operate</a> well.

With any luck there is a <a href="https://stackoverflow.com/questions/5724558/is-there-a-javascript-implementation-for-ws-i-reliable-secure-profile">Javascript</a> implementation out there as well.

There is also a Silverlight implementation that uses <a href="http://msdn.microsoft.com/en-us/library/cc645027%28v=vs.95%29.aspx" rel="nofollow noreferrer">HTTP Duplex.</a> You can <a href="https://stackoverflow.com/questions/5449642/http-push-comet-reverse-ajaxusing-silverlight-to-javascript-bridge">connect javascript to the Silverlight</a> object to get callbacks when a push occurs.

There are also <a href="https://stackoverflow.com/questions/5427681/how-do-modern-implementations-of-comet-reverse-ajax-work-any-stable-c-wcf-or-as">commercial paid versions</a> as well.

blocks|key|1764508|text|我认为，除非您准备水平扩展web场(通过向组合中添加更多web服务器)，否则Comet方法并不是真正可伸缩的。它的工作方式是为每个用户会话保留一个打开的TCP连接，这样服务器就可以不时地将内容推送到该连接中，以便在发生更改或活动时立即通知用户。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1764509|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

I think the Comet approach isn't really scalable unless you are prepared to expand the web farm horizontally (by adding more web servers to the mix). The way it works is that it leaves a TCP connection open per user session, just so the server can push stuff into that connection from time to time to immediately inform the user of a change or activity.

I've been looking at ways to implement gmail-like messaging inside a browser, and arrived at the <a href="http://en.wikipedia.org/wiki/Comet_(programming)" rel="noreferrer">Comet</a> concept. However, I haven't been able to find a good .NET implementation that allows me to do this within IIS (our application is written in ASP.NET 2.0). 

The solutions I found (or could think of, for that matter) require leaving a running thread per user - so that it could return a response to him once he gets a message. This doesn't scale at all, of course.

So my question is - do you know of an ASP.NET implementation for Comet that works in a different way? Is that even possible with IIS?

Comet implementation for ASP.NET?

服务器

HTML5

我一直在寻找在浏览器中实现类似gmail的消息传递的方法，并得出了的概念。但是，我还没有找到一个好的.NET实现，它允许我在IIS2.0中完成这项工作(我们的应用程序是用ASP.NET 2.0编写的)。我发现的(或者可以想到的)解决方案需要为每个用户留下一个正在运行的线程-这样一旦他收到消息，线程就可以向他返回响应。当然，这根本不具有可伸缩性。所以我的问题是-您是否知道Comet的ASP.NET实

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