signalR2:OnDisconnected在页面刷新时立即触发

时间:2016-01-16 13:57:09

标签: c# asp.net signalr

OnDisconnect方法是否应该在被触发之前等待默认的30秒?对我来说,它会在页面刷新时立即触发(F5)。

我有一个User对象,用于跟踪哈希集中的用户连接。

在我的中心,我有一本字典来跟踪已连接的用户。

OnConnected:我将该用户添加到字典中,如果用户已经存在,我只需将另一个connectionid添加到用户hashset。

OnDisconnected:我从调用用户hashset中删除了connectionId,如果他没有任何连接,我从字典中删除用户对象。

我需要跟踪用户对象,并且在每次刷新页面时都会丢失它(F5)因为OnDisconnected会立即被触发并删除仅用户连接和对象。当页面再次加载时,会创建一个新的用户对象,导致旧的用户对象被立即删除。

我的实现看起来像这样

  private static readonly ConcurrentDictionary<string, User> Users 
        = new ConcurrentDictionary<string, User>();

    public override Task OnConnected() {

        string userName = Context.User.Identity.Name;
        string connectionId = Context.ConnectionId;

        var user = Users.GetOrAdd(userName, _ => new User {
            Name = userName,
            ConnectionIds = new HashSet<string>()
        });

        lock (user.ConnectionIds) {

            user.ConnectionIds.Add(connectionId);

            // TODO: Broadcast the connected user
        }

        return base.OnConnected();

        }

        public override Task OnDisconnected() {

        string userName = Context.User.Identity.Name;
        string connectionId = Context.ConnectionId;

        User user;
        Users.TryGetValue(userName, out user);

        if (user != null) {

            lock (user.ConnectionIds) {

                user.ConnectionIds.RemoveWhere(cid => cid.Equals(connectionId));

                if (!user.ConnectionIds.Any()) {

                    User removedUser;
                    Users.TryRemove(userName, out removedUser);

                    // You might want to only broadcast this info if this 
                    // is the last connection of the user and the user actual is 
                    // now disconnected from all connections.
                    Clients.Others.userDisconnected(userName);
                }
            }
        }

        return base.OnDisconnected();
    }

1 个答案:

答案 0 :(得分:0)

所以我通过在OnDisconnected方法中运行一个任务并将方法延迟x秒来解​​决这个问题,然后检查用户是否已经重新连接,如果他没有将他从列表中删除。

public override Task OnDisconnected(bool stopCalled)
        {
                Task mytask = Task.Run(() =>
                {
                    UserDisconnected(Context.User.Identity.Name, Context.ConnectionId);
                });



            return base.OnDisconnected(stopCalled);
        }


private async void UserDisconnected(string un, string cId)
        {
            await Task.Delay(10000);
            string userName = un;
            string connectionId = cId;

            User user;
            enqueuedDictionary.TryGetValue(userName, out user);

            if (user != null)
            {
                lock (user.ConnectionIds)
                {

                    user.ConnectionIds.RemoveWhere(cid => cid.Equals(connectionId));

                    if (!user.ConnectionIds.Any())
                    {

                        User removedUser;
                        enqueuedDictionary.TryRemove(userName, out removedUser);
                        ChatSession removedChatSession;
                        groupChatSessions.TryRemove(userName, out removedChatSession);
                        UpdateQ(removedUser.QPos);
                    }
                }
            }
        }