SignalR（V2.2.0）OnDisconnected设置用户下线 [英] SignalR(v2.2.0) OnDisconnected set user offline
问题描述
我使用下面的代码在组中添加用户，并保存用户对使用下面的代码这一特定群体分贝
I am using the following code to add user in group and save user in db against this particular group using the following code.
服务器：
public class ChatHub : Hub
{
public async Task JoinRoom(string user_Id, string room_Id, string user_Name)
{
AddLoginUser(room_Id, this.Context.ConnectionId, user_Id);
await this.Groups.Add(this.Context.ConnectionId, room_Id);
}
public void Connect(string user_Id, string room_Id, string user_Name)
{
var id = Context.ConnectionId;
Clients.Caller.onConnected(id, user_Name, GetRoomUser(room_Id), GetRoomMessage(room_Id));
// send to all in group to update user list
Clients.OthersInGroup(room_Id).onNewUserConnected(id, user_Name);
}
public override System.Threading.Tasks.Task OnDisconnected(bool stopCalled)
{
using (DataContext dc = new DataContext())
{
var item = dc.LoggedInUsers.FirstOrDefault(x => x.ConnectionId == Context.ConnectionId);
if (item != null)
{
item.Connected = false;
dc.SubmitChanges();
Clients.OthersInGroup(item.RoomID.ToString()).onUserDisconnected(Context.ConnectionId, item.UserMaster.User_Name);
}
return base.OnDisconnected(stopCalled);
}
}
}
private void AddLoginUser(string room_Id, string connection_Id, string user_Id)
{
using (DataContext dc = new DataContext())
{
var checkUserLogedIn = (from user in dc.LoggedInUsers
where (user.RoomID == Convert.ToInt32(room_Id) && user.UserID == Convert.ToInt32(user_Id))
select user).SingleOrDefault();
if (checkUserLogedIn == null)
{
LoggedInUser objLoggedInUser = new LoggedInUser();
objLoggedInUser.ConnectionId = connection_Id;
objLoggedInUser.UserID = Convert.ToInt32(user_Id);
objLoggedInUser.RoomID = Convert.ToInt32(room_Id);
objLoggedInUser.Connected = true;
dc.LoggedInUsers.InsertOnSubmit(objLoggedInUser);
dc.SubmitChanges();
}
else
{
if (!checkUserLogedIn.Connected)
{
checkUserLogedIn.Connected = true;
dc.SubmitChanges();
}
}
}
}
< STRONG>问题：
假设我登录的用户ID与= 1 roomid = 1，关联标识符= 123asd。如果我刷新我的窗前，然后关联标识符会改变，现在如果我关闭浏览器选项卡，然后下面的查询：
Suppose i logged-in with userid=1 for roomid=1 and contextid=123asd. If i refresh my window then contextid will change and now if i closing browser tab then following query:
var item = dc.LoggedInUsers.FirstOrDefault(x => x.ConnectionId == Context.ConnectionId);
找不到反对最新的ConnectionId用户，因为当我有保存的用户当时的ConnectionId连接是不同的。
not find out the user against latest connectionid, because when i had saved user on connect at that time connectionid was different.
如何设置连接的状态假就断开事件特定的用户。
How i can set connected status false for particular user on disconnect event.
在此先感谢
推荐答案
OnConnected 您应该保存所有connectionIds（它映射与用户）的ConnectionId应该是唯一的，而不是用户。由于用户可以有多个连接在同一时间（新建选项卡），以signalr。
OnConnected you should save all connectionIds (which is mapped with user), connectionId should be unique, not the user. Because a user can have more than one connection to signalr at the same time(New Tabs).
每当你应该在 Onconnected映射用户和的ConnectionId 。每当你应该删除的ConnectionId，而不是 OnDisconnected 的用户的所有connectionIds。你应该添加用户的ConnectionId，如果它不在列表中（如果停止叫不叫断开偶可发生用户不是断开）在 OnReconnected 。
Everytime you should map user and connectionId on Onconnected. Everytime you should just remove that connectionId, not all connectionIds of user on OnDisconnected. You should add connectionId with user if it's not in list(if stop called is not called disconnected can occur even user is not disconnected) on OnReconnected.
您应该重构这个代码库。首先，你应该删除的ConnectionId。然后，您可以检查;如果有没有留下记录与该用户（它映射与的ConnectionId）的列表中，您可以发送邮件
You should refactor your code base on this. First, you should remove connectionId. Then, you can check; if there is no record left with this user(which is mapped with that connectionId) on list, you can send message.
检查的这里
我已经改变你的代码一点，可以提高基于这种认识这个代码。你应该叫 AddLoginUser 在 OnReconnected 也。
I have changed your code a bit, you can improve this code based on this knowledge. You should call AddLoginUser on OnReconnected also.
public override System.Threading.Tasks.Task OnDisconnected(bool stopCalled)
{
using (DataContext dc = new DataContext())
{
var item = dc.LoggedInUsers.FirstOrDefault(x => x.ConnectionId == Context.ConnectionId);
if (item != null)
{
dc.LoggedInUsers.Remove(item);
dc.SubmitChanges();
//If there is no other connection left with this user in this room send message.
if (!dc.LoggedInUsers.Any(x => x.RoomID==item.RoomID && x.userId==item.UserId)
Clients.OthersInGrouproomId.ToString()).onUserDisconnected(Context.ConnectionId, item.UserMaster.User_Name);
}
return base.OnDisconnected(stopCalled);
}
}
}
private void AddLoginUser(string room_Id, string connection_Id, string user_Id)
{
using (DataContext dc = new DataContext())
{
//Just check connectionId uniqunes. You don't need connected field.
var checkUserLogedIn = (from user in dc.LoggedInUsers
where user.ConnectionId == connection_Id
select user).SingleOrDefault();
if (checkUserLogedIn == null)
{
LoggedInUser objLoggedInUser = new LoggedInUser();
objLoggedInUser.ConnectionId = connection_Id;
objLoggedInUser.UserID = Convert.ToInt32(user_Id);
objLoggedInUser.RoomID = Convert.ToInt32(room_Id);
dc.LoggedInUsers.InsertOnSubmit(objLoggedInUser);
dc.SubmitChanges();
}
}
}
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