我使用以下代码在组中添加用户,并使用以下代码将用户保存在该特定组的数据库中。
SERVER:
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();
}
}
}
}
Problem:
假设我使用 userid=1 登录,roomid=1 且 contextid=123asd。如果我刷新窗口,则 contextid 将更改,现在如果我关闭浏览器选项卡,然后执行以下查询:
var item = dc.LoggedInUsers.FirstOrDefault(x => x.ConnectionId == Context.ConnectionId);
没有根据最新的connectionid找出用户,因为当我在连接上保存用户时,connectionid是不同的。
我如何在断开连接事件时将特定用户的连接状态设置为 false。
提前致谢。