如何使用 Chatter Application MVC 显示用户在线？

Question

我正在创建 MVC 应用程序 chatter 应用程序。我想在聊天中显示谁在线。怎么显示？

我有喋喋不休的控制器代码：

public ActionResult ChatterList(int ProjectId)
{
    ReadCookieValue cookie = new ReadCookieValue();
    clientId = cookie.readuserinfo().ClientId;
    userId = cookie.readuserinfo().Id;
    roleId = cookie.readuserinfo().RoleId;
    ChatterViewModel model = new ChatterViewModel();
    model.chattersList = Task.Run(() => _project.GetChatterList(ProjectId)).Result;
    foreach (var item in model.chattersList)
    {
        item.CurrentUserId = userId;
    }
    model.newChatter = new ChatterModel();
    model.newChatter.ProjectId = ProjectId;
    model.newChatter.UserId = userId;
    model.newChatter.UserName = cookie.readuserinfo().UserName;
    return View("ProjectChatter", model);
}

public async Task<ActionResult> AddChatter(ChatterViewModel model)
{
    if (model != null)
    {
        var obj = await _project.AddChatterList(model);
        if (model.newChatter.ProjectId == 3)
        {
            return RedirectToAction("EbitDaReports");
        }
    }
    return RedirectToAction("Reports");
}

我使用项目 ID 视图创建了聊天，代码看起来像

<div class="col-lg-6">
    <div class="ibox-content">
        <div class="chat-discussion">

            <div class="ibox float-e-margins">




                <div class="chat-element right">
                    <div class="row m-t-lg">

                        @if (Model.ProjectId > 0)
                        {
                            @Html.Action("ChatterList", "Projects", new { @ProjectId = Model.ProjectId })
                        }
                    </div>

                </div>



            </div>
        </div>


    </div>
</div>

我正在尝试使用

<div class="row">
    @if (HttpRuntime.Cache["ProjectId"] != null)
    {
        var loggedOnUsers = HttpRuntime.Cache["ProjectId"] as Dictionary<string, DateTime>;

        if (loggedOnUsers != null)
        {<div class="ProjectId">
        }
        <span> Online Users: </span>
    </div>
        }
    }
</div>

我什么也得不到。我需要创建新的控制器？否则我可以覆盖现有的控制器？

Answer 1

您需要遍历字典项并显示它。

<div class="row">
    @if (HttpRuntime.Cache["ProjectId"] != null)
    {
        var loggedOnUsers = HttpRuntime.Cache["ProjectId"] as Dictionary<string, DateTime>;
        <span> Online Users: </span>
        if (loggedOnUsers != null)
        {
            foreach (var userItem in loggedOnUsers.Keys)
            {
                <p>@userItem <span>@loggedOnUsers[userItem]</span></p>
            }
        }
        else
        {
            <p>No users!</p>
        }

    }
    else
    {
      <h2>Could not find a HttpRuntime Cache entry with key "ProjectId"</h2>
    }
</div>

这将列出用户及其时间，假设HttpRuntime.Cache["ProjectId"] 存储在线用户的字符串和日期时间字典。

编辑： 显示如何将数据设置到缓存的示例代码。

这是您将项目添加到缓存的方式，您需要在应用程序的某处执行这样的代码（可能是当用户登录聊天时，添加一个新条目）。

var data = HttpRuntime.Cache["ProjectId"] as Dictionary<string, DateTime>;
if(data==null)
    data=new Dictionary<string, DateTime>();
data.Add("Scott",DateTime.Now);
data.Add("Shyju", DateTime.Now);
data.Add("Kevin", DateTime.Now);
HttpRuntime.Cache["ProjectId"] = data;