blocks|key|3296202|text|最好的方法是像你一样做，但是通过活动来计时。如果给定的会话在大约5分钟内没有访问页面，您可以认为它们不再处于活动状态。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3296203|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|$]]

Best way is like you do, but time it out via activity. If a given session doesn't access a page within 5 minutes or so, you may consider them no longer active.

blocks|key|3296263|text|如果您使用的是ASP.Net会员资格，请查看GetNumberOfUsersOnline。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|3296264|entityMap|0|LINK|mutability|MUTABLE|url|http://msdn.microsoft.com/en-us/library/system.web.security.membership.getnumberofusersonline.aspx^0|M|M|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]]]]

If you're using ASP.Net membership, take a look at <a href="http://msdn.microsoft.com/en-us/library/system.web.security.membership.getnumberofusersonline.aspx" rel="nofollow noreferrer">GetNumberOfUsersOnline</a>.

blocks|key|2263094|text|对于您可以记录的每个用户操作，您需要在特定的时间窗口内将其视为“在线”。根据网站的不同，您可以将其设置为5分钟。实际的web请求应该不会超过一秒。你必须做出一些假设，他们可能会在那个页面上停留多长时间，除了被认为是在线的之外，什么都不做。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2263095|这种方法要求您跟踪每个用户最后一次活动的时间。|2263096|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

For every user action that you can record, you need to consider them "online" for a certain window of time. Depending on the site, you may set that to 5 minutes. The actual web request should take less than a second. You have to make some assumption about how long they might stay on that page and do nothing but be considered online.

This approach requires that you keep track of the time of each users last activity.

blocks|key|5407342|text|使用Performance+Counters|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|5407343|5407344|blockquote|5407345|5407346|5407347|State服务器会话Active：活动用户会话数。|unordered-list-item|style|BOLD|5407348|5407349|entityMap|0|LINK|mutability|MUTABLE|url|http://www.microsoft.com/technet/prodtechnol/WindowsServer2003/Library/IIS/a8c5b994-7722-4dc6-a246-7dfe667c6816.mspx?mfr=true^0|2|K|0|0|0|0|0|0|0|G|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@$A|X|B|Y|1|Z]]|C|$]]|$1|D|3|-4|5|6|7|10|8|@]|9|@]|C|$]]|$1|E|3|-4|5|F|7|11|8|@]|9|@]|C|$]]|$1|G|3|-4|5|6|7|12|8|@]|9|@]|C|$]]|$1|H|3|-4|5|6|7|13|8|@]|9|@]|C|$]]|$1|I|3|J|5|K|7|14|8|@$A|15|B|16|L|M]]|9|@]|C|$]]|$1|N|3|-4|5|6|7|17|8|@]|9|@]|C|$]]|$1|O|3|-4|5|6|7|18|8|@]|9|@]|C|$]]]|P|$Q|$5|R|S|T|C|$U|V]]]]

Use <a href="http://www.microsoft.com/technet/prodtechnol/WindowsServer2003/Library/IIS/a8c5b994-7722-4dc6-a246-7dfe667c6816.mspx?mfr=true" rel="nofollow noreferrer">Performance Counters</a>:

<blockquote>
 <ul>
 <li>State Server Sessions Active: The
 number of active user sessions.</li>
 </ul>
</blockquote>

blocks|key|3296297|text|扩展silky在他的回答中所说的--因为真正的http是无状态的来确定用户当前是否在线，你真的只能跟踪自从用户上次访问你的网站有多长时间，并决定你认为请求之间有多长时间仍然活跃。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3296298|因为你说这不是基于用户登录的，所以在过去的5分钟内，你收到了多少个不同的IP地址的请求(或者你认为的“在线”超时时间有多长)。|3296299|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

Expanding what silky said in his answer - since really http is stateless to determine if the user is currently 'online' you can really only track how long since the user last accessed your site and make a determination on how long between requests your consider to still be active.

Since you stated that this isn't based upon users logging in may it's a simple of how many different IP addresses you received requests from in the past 5 minutes (or however long you consider the 'online' timeout to be).

blocks|key|2263132|text|不要为此使用会话，除非您还需要用于其他方面的会话；否则，这是过度杀伤力。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2263133|假设是单服务器安装，请执行以下操作：|2263134|2263135|对于每个用户，发出一个包含唯一ID的cookie+|ordered-list-item|2263136|在HttpModule+(或Global.asax)中维护一个包含唯一ID及其最后访问时间的静态表|2263137|，将新用户输入到表中并更新他们的访问时间(使用适当的锁定来防止竞争cookie从后台线程或内联到用户请求，从表中删除在过去N分钟内没有做出请求的条目。您可能还希望支持将在线人数作为表|2263138|的大小进行显式的“注销”|2263139|如果使用会话，则可以使用会话ID作为唯一标识符。但是，请记住，除非配置了Session_Start()事件，否则在会话字典中存储内容之前不会发出会话in。|2263140|在负载均衡或网络花园场景中，它变得有点复杂，但您可以使用相同的基本思想，只是将信息持久存储在数据库中，而不是存储在内存中。|2263141|entityMap^0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|T|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|U|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|V|8|@]|9|@]|A|$]]|$1|E|3|F|5|G|7|W|8|@]|9|@]|A|$]]|$1|H|3|I|5|G|7|X|8|@]|9|@]|A|$]]|$1|J|3|K|5|G|7|Y|8|@]|9|@]|A|$]]|$1|L|3|M|5|6|7|Z|8|@]|9|@]|A|$]]|$1|N|3|O|5|6|7|10|8|@]|9|@]|A|$]]|$1|P|3|Q|5|6|7|11|8|@]|9|@]|A|$]]|$1|R|3|-4|5|6|7|12|8|@]|9|@]|A|$]]]|S|$]]

Don't use sessions for this unless you also need sessions for something else; it's overkill otherwise.

Assuming a single-server installation, do something like this:

<ol>
<li>For each user, issue a cookie that contains a unique ID</li>
<li>Maintain a static table of unique IDs and their last access time</li>
<li>In an HttpModule (or Global.asax), enter new users into the table and update their access times (use appropriate locking to prevent race conditions)</li>
<li>Periodically, either from a background thread or in-line with a user request, remove entries from the table that haven't made a request within the last N minutes. You might also want to support an explicit "log out" feature.</li>
<li>Report the number of people online as the size of the table</li>
</ol>

If you do use sessions, you can use the Session ID as the unique identifier. However, keep in mind that Session IDs aren't issued until you store something in the Session dictionary, unless you have a Session_Start() event configured.

In a load balanced or web garden scenario, it gets a little more complicated, but you can use the same basic idea, just persisting the info in a database instead of in memory.

blocks|key|5407521|text|当用户登录时，将其用户名写入HttpContext.Current.Cache，并设置相应的过期时间(比如20分钟)。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5407522|然后在Application_PreRequestHandlerExecute的Global.asax.cs中“触摸”当前用户的缓存项，以便重置滑动过期。|5407523|当用户明确注销时，将其用户名从HttpContext.Current.Cache中删除。|5407524|如果你这样做，在任何给定的时间，HttpContext.Current.Cache.Count都会给你当前的用户数。|5407525|注意:这是假设您没有将缓存用于其他目的。|5407526|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|M|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|N|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|O|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|P|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|K|$]]

When the user logs in write his user name into the HttpContext.Current.Cache with a sliding expiration (say 20 minutes).

Then in the Global.asax.cs in the Application_PreRequestHandlerExecute "touch" the cache entry for the current users so it resets the sliding expiration.

When a user explicitly logs out, remove his username from HttpContext.Current.Cache. 

If you do this, at any given time HttpContext.Current.Cache.Count will give you the # of current users.

Note: this is assuming you aren't using the Cache for other purposes.

I have a requirement that my site always display the number of users currently online. For example, "35741 Users Currently Online". This is not based on a log in, simply how many users are currently on my site. I have tried using Session Start/Session End for this, however session end is not reliable. Therefore I get inflated numbers, as my session start adds numbers but session end doesn't remove them because it doesn't fire.

There is no additional information to be gathered from this (reporting, etc), it's simply requested that the number show up. Very simple request that's turning into a huge deal. Any help is appreciated. 

EDIT:

I should specify that I have also tried using a database for this. Simple table that contains a session ID and a last activity column. With each page hit, I check to see if the session is in my database. If not, insert. If so, update with activity time. Then I run a procedure that sweeps the database looking for sessions with no activity in the last 20 minutes. This approach seemed to kill my SQL server and/or IIS. Had to restart the site.

Best way to keep track of current online users

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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我有一个要求，我的网站总是显示当前在线的用户数。例如，"35741用户当前在线“。这不是基于登录，只是有多少用户目前在我的网站。为此，我尝试使用会话开始/会话结束，但是会话结束并不可靠。因此，我得到了夸大的数字，因为我的会话开始会添加数字，但会话结束不会删除它们，因为它不会触发。没有额外的信息要从这里收集(报告等)，它只是要求数字显示出来。非常简单的请求正在变成一个巨大的交易。任何帮助都是非常感谢

问跟踪当前在线用户的最佳方法
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