SignalR - 检查用户是否仍处于连接状态 [英] SignalR - Checking if a user is still connected

问题描述

我有一个带有称为客户端的方法的集线器.此方法使用每 10 秒运行一次的委托启动一个计时器.由于在没有人连接到集线器的情况下继续运行此委托是没有意义的，因此我想在重新安排它之前检查是否仍有用户从委托内部连接.有没有办法做到这一点?

I have a hub with method that is called client-side. This method launches a timer with a delegate that runs every 10 seconds. Since it wouldn't make sense to keep running this delegate if no one is connected to the hub, I want to check if any users are still connected from inside the delegate before I reschedule it. Is there any way to do this?

推荐答案

可能最常用的解决方案是保留一个静态变量，其中包含当前连接的用户并覆盖 OnConnect 和 OnDisconnect 或根据您使用的版本实施 IDisconnect.

Probably the most used solution is to keep a static variable containing users currently connected and overriding OnConnect and OnDisconnect or implementing IDisconnect depending on the version that you use.

你会实现这样的事情:

public class MyHub : Hub
{
    private static List<string> users = new List<string>();
    public override Task OnConnected()
    {
        users.Add(Context.ConnectionId);
        return base.OnConnected();
    }

    //SignalR Verions 1 Signature
    public override Task OnDisconnected()
    {
        users.Remove(Context.ConnectionId);
        return base.OnDisconnected();
    }

    //SignalR Version 2 Signature
    public override Task OnDisconnected(bool stopCalled)
    {
        users.Remove(Context.ConnectionId);
        return base.OnDisconnected(stopCalled);
    }

    // In your delegate check the count of users in your list.
}

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