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Determining an 'active' user count of an ASP.NET site

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南旧
南旧 2021-01-01 01:36

On an ASP.NET site, what are some techniques that could be used to track how many users are logged in to the site at any given point in time?

So for example, I could

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  • 旧巷少年郎
    2021-01-01 02:05

    First set Session timeout for 1 minute.

    Create a simple heartbeat.aspx page with no HTML content just the following javascript code:

    <html>
  <head>
  <script language="javascript">
  function reloadPage()
  {
    window.navigate("heartbeat.aspx");
  }
  </script>
  </head>
<body onload="window. setTimeout(‘reloadPage()’, 30000)">
</body>
</html>

    This will re-request itself every 30 seconds and keep session alive.

    Put heatbeat.aspx page in a hidden frame.

    To get user count just get session count by using static counter in Session_Start and Session_End events in Global.asax.

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  • 走了就别回头了
    2021-01-01 02:09

    If you are using InProc session state, you can do it like this in global.asax

    Sub Application_Start(ByVal sender As Object, ByVal e As EventArgs)
    Application("ActiveSessionCount") = 0
End Sub

Sub Session_Start(ByVal sender As Object, ByVal e As EventArgs)
    Application("ActiveSessionCount") += 1
End Sub

Sub Session_End(ByVal sender As Object, ByVal e As EventArgs)
    Application("ActiveSessionCount") -= 1
End Sub

    To access the value on a web form is just as simple

    Dim Count as Integer = Application("ActiveSessionCount")
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  • 广开言路
    2021-01-01 02:09 
    public class ActiveUsers
{
    private static List<LastUserActivity> users;
    private static object syncroot = new object();
    private static DateTime lastPruned;

    public static int SessionLength = 20;

    static ActiveUsers()
    {
        users = new List<LastUserActivity>();
        lastPruned = DateTime.UtcNow;
    }

    public void RecordUserActivity(int userId)
    {
        lock (syncroot)
        {
            var user = users.FirstOrDefault(x => x.UserId == userId);
            if (user == null)
            {
                user = new LastUserActivity() { UserId = userId };
                users.Add(user);
            }
            user.UtcTime = DateTime.UtcNow;

            if (lastPruned.AddMinutes(5) < DateTime.UtcNow)
            {
                Prune();
                lastPruned = DateTime.UtcNow;
            }
        }
    }

    private static void Prune()
    {
        users.RemoveAll(x => x.UtcTime.AddMinutes(SessionLength) < DateTime.UtcNow);
    }

    public int GetActiveUsers()
    {
        return users.Count;
    }
}
public class LastUserActivity
{
    public int UserId { get; set; }
    public DateTime UtcTime { get; set; }
}

    Add a call to ActiveUsers into a method in global.asax (eg. BeginRequest, AcquireRequestState).

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  • 孤独总比滥情好
    2021-01-01 02:12

    I think what I've used in the past was the Global.asax functions mainly centering around the Session_Start and Session_End, increasing a count with the Start, and then the end is a bit tricky because of the session timeout. If you are not concerned a lot with how exactly accurate the count is then you can stop here.

    If not then you'd probably use a combination of the javascript onUnload event with some sort of ajax request to invalidate the session and subtract the user. The event would have to see if the user was actually leaving the page or just going to another page on the site.

    Anyway, start there. I remember having to do with ASP sites so there is definately some information out there on this method.

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  • 感动是毒
    2021-01-01 02:13

    If using SQL Server for Session storage (i.e. <sessionState> mode is "SQLServer" in web.config), you can't use a solution that relies on Session_End in global.asax, as the method will never be called.

    However, assuming that SQL Agent is running the DeleteExpiredSessions job correctly (which it should be by default when SQL State was installed), you can just run the following SQL against the Session Db:

    SELECT COUNT(SessionId) FROM ASPStateTempSessions
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  • 遥遥无期
    2021-01-01 02:14

    Does the website log the user in? If it does, then you can update a "Last Visit" field in the user table every time they request a new page, and then every hour, just do a SQL query that grabs everybody who has a "Last Visit" timestamp within the last 15 minutes or so (assumed to currently be on the site).

    If you're not having people log in, you could just as easily do it by IP address instead of username. With this method, though, you may run into some proxy issues (ie multiple users from the same corporate network may all come from a single IP address, so they only count as one user in your totals), but that should be minimal.

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