上网用户在asp.net mvc的列表 [英] get a list of online users in asp.net mvc

问题描述

我在我的应用程序，它始终显示在线用户的更新列表的页面。
现在，以保持列表的存储在应用对象 - 更新，我做以下步骤

I have a page in my application which always shows updated list of online users. Now, to keep the list-which is stored in application object- updated, i do the below steps

1. 添加用户列表时登录

1. add user to list when login

去除注销用户

然后处理浏览器关闭/导航离开的情况下，我有一个时间戳和集合中的用户名一起
每90秒一个AJAX调用更新的时间戳。

Then to handle browser close/navigate away situations, I have a timestamp along with the username in the collection An ajax call every 90 seconds updates the timestamp.

问题：
我需要的东西清理这个列表每120秒与旧时间戳删除条目。

The problem: I need something to clean this list every 120 seconds to remove entries with old timestamps.

我如何做到这一点我的web应用程序中？即调用函数，每2分钟。

How do I do this within my web application? ie Call a function every 2 mins.

PS：我想调用web服务，每2分钟使用调度，但托管环境不允许任何调度

PS: I thought of calling a webservice every 2 mins using a scheduler , but the hosting environment do not allow any scheduling.

推荐答案

在您的账户控制器

   public ActionResult Login(LoginModel model, string returnUrl)
    {
        if (ModelState.IsValid)
        {
            if (Membership.ValidateUser(model.UserName, model.Password))
            {
                FormsAuthentication.SetAuthCookie(model.UserName, model.RememberMe);
                if (HttpRuntime.Cache["LoggedInUsers"] != null) //if the list exists, add this user to it
                {
                    //get the list of logged in users from the cache
                    List<string> loggedInUsers = (List<string>)HttpRuntime.Cache["LoggedInUsers"];
                    //add this user to the list
                    loggedInUsers.Add(model.UserName);
                    //add the list back into the cache
                    HttpRuntime.Cache["LoggedInUsers"] = loggedInUsers;
                }
                else //the list does not exist so create it
                {
                    //create a new list
                    List<string> loggedInUsers = new List<string>();
                    //add this user to the list
                    loggedInUsers.Add(model.UserName);
                    //add the list into the cache
                    HttpRuntime.Cache["LoggedInUsers"] = loggedInUsers;
                }
                if (!String.IsNullOrEmpty(returnUrl))
                {
                    return Redirect(returnUrl);
                }
                else
                {

                    return RedirectToAction("Index", "Home");
                }
            }
            else
            {
                ModelState.AddModelError("", "The user name or password provided is incorrect.");
            }
        }

        // If we got this far, something failed, redisplay form
        return View(model);
    }


    public ActionResult LogOff()
    {
        string username = User.Identity.Name; //get the users username who is logged in
        if (HttpRuntime.Cache["LoggedInUsers"] != null)//check if the list has been created
        {
            //the list is not null so we retrieve it from the cache
            List<string> loggedInUsers = (List<string>)HttpRuntime.Cache["LoggedInUsers"];
            if (loggedInUsers.Contains(username))//if the user is in the list
            {
                //then remove them
                loggedInUsers.Remove(username);
            }
            // else do nothing
        }
        //else do nothing
        FormsAuthentication.SignOut();
        return RedirectToAction("Index", "Home");
    }

在您的局部视图。

@if (HttpRuntime.Cache["LoggedInUsers"] != null)
{
    List<string> LoggedOnUsers = (List<string>)HttpRuntime.Cache["LoggedInUsers"];
    if (LoggedOnUsers.Count > 0)
    {
    <div class="ChatBox">
        <ul>
            @foreach (string user in LoggedOnUsers)
            {
                <li>
                    <div class="r_row">
                       <div class="r_name">@Html.Encode(user)</div>
                    </div>
                </li>
            }
        </ul>
    </div>
    }
}

使这个局部视图，当用户登录

render this partial view when user log in.

使用这个脚本调用以往90秒

use this script call ever 90 second

<script type="text/javascript">
    $(function () {
        setInterval(loginDisplay, 90000);
    });

    function loginDisplay() {
        $.post("/Account/getLoginUser", null, function (data) {

        });
    }
</script>

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