$scope.myHub = new hub("chatHub", {
  listeners: {},
  methods: []
})

 $scope.myHub.promise.done(function () {
     $scope.myHub.init();
     $scope.myHub.promise.done(function () { });
  });

 $scope.requestChat = function (msg) {
                if (!defaultCustomerUserName) {
                    //گرفتن کاربر لاگین شده
                    //ما از آرایه تصادفی استفاده میکنیم
                    var nameDefaultArray = [
                        'حسین', 'حسن', 'علی', 'عباس', 'زهرا', 'سمیه'
                    ];
                    defaultCustomerUserName=nameDefaultArray[Math.floor(Math.random() * nameDefaultArray.length)];
                }
                var userName = defaultCustomerUserName;
                if (!$scope.chatId) {
                    $scope.chatId = sessionStorage.getItem(chatKey);
                    $http.get("http://ipinfo.io")
                      .success(function (response) {
                          $scope.myHub.logVisit(response.city, response.country, msg, userName);
                      }).error(function (e, status, headers, config) {
                          $scope.myHub.logVisit("Tehran", "Ir", msg, userName)
                      });
                    $scope.myHub.requestChat(msg);
                    $scope.chatTitle = $scope.options.waitingForOperator;
                    $scope.pendingRequestChat = true;
                } else {
                    $scope.myHub.clientSendMessage(msg, userName);
                };
                $scope.message = "";
            };

public void AcceptRequestChat(string customerConnectionId, string body, string userName)
        {
            var agent = FindAgent(Context.ConnectionId);
            var session = _chatSessions.FirstOrDefault(item => item.Key.Equals(agent.Key));
            if (session == null)
            {
                _chatSessions.Add(new ChatSessionVm
                {
                    Key = agent.Key,
                    Value = new List<string> { customerConnectionId }
                });
            }
            else
            {
                session.Value.Add(customerConnectionId);
            }
            Clients.Client(Context.ConnectionId).agentChat(customerConnectionId, body, userName);
            Clients.Client(customerConnectionId).clientChat(customerConnectionId, agent.Value.UserName);
            foreach (var item in _agents.Where(item => item.Value.IsOnline))
            {
                Clients.Client(item.Value.ConnectionId).refreshChatWith(agent.Value.UserName, customerConnectionId);
            }
       var session = _db.Sessions.Add(new Session
            {
                AgentName = agent.Key,
                CustomerName = userName,
                CreatedDateTime = DateTime.Now
            });
            _db.SaveChanges();

            var message = new Message
            {
                CreationTime = DateTime.Now,
                Sender = agent.Key,
                Receiver = userName,
                body=body,
                Session = session
            };
            _db.Messages.Add(message);
            _db.SaveChanges();
        }

public void CloseChat(string id)
        {
            var findAgent = FindAgent(Context.ConnectionId);
            var session = _chatSessions.FirstOrDefault(item => item.Value.Contains(id));
            if (session == null) return;
            Clients.Client(id).clientAddMessage(findAgent.Key, "مکالمه شما با کارشناس مربوطه به اتمام رسیده است");

            foreach (var agent in _agents)
            {
                Clients.Client(agent.Value.ConnectionId).refreshLeaveChat(agent.Value.UserName, id);
            }
            _chatSessions.Remove(session);
        }

   public void EngageVisitor(string newAgentId, string cumtomerId, string customerName,string clientSessionId)
        {
            #region remove session of current agent
            var currentAgent = FindAgent(Context.ConnectionId);
            var currentSession = _chatSessions.FirstOrDefault(item => item.Value.Contains(cumtomerId));
            if (currentSession != null)
            {
                _chatSessions.Remove(currentSession);
            }
            #endregion

            #region add  session to new agent
            var newAgent = FindAgent(newAgentId);
            var newSession = _chatSessions.FirstOrDefault(item => item.Key.Equals(newAgent.Key));
            if (newSession == null)
            {
                _chatSessions.Add(new ChatSessionVm
                {
                    Key = newAgent.Key,
                    Value = new List<string> { cumtomerId }
                });
            }
            else
            {
                newSession.Value.Add(cumtomerId);
            }
            #endregion

            Clients.Client(currentAgent.Value.ConnectionId).addMessage(cumtomerId, newAgent.Key,
                "ادامه مکالمه به کارشناس  " + newAgent.Key + "مقابل  منتقل شد");
            Clients.Client(newAgentId).addMessage(cumtomerId, currentAgent.Key,
                "لطفا مکالمه را ادامه دهید.با تشکر");

            Clients.Client(cumtomerId).clientAddMessage(newAgent.Value.UserName,
                "مکالمه شما با کارشناس زیر برقرار گردید" + newAgent.Key);

            var session = _db.Sessions.FirstOrDefault
                (item => item.AgentName.Equals(currentAgent.Value.UserName)
                 && item.CustomerName.Equals(customerName));
            if (session != null)
            {
                var sessionId = session.Id;
                var messages = _db.Messages.Where(item => item.Session.Id.Equals(sessionId));
                var result = JsonConvert.SerializeObject(messages, new Formatting(), _settings);
                Clients.Client(newAgentId).visitorSwitchConversation
                    (Context.ConnectionId, customerName, result, clientSessionId);
            }
            foreach (var item in _agents.Where(item => item.Value.IsOnline))
            {
                Clients.Client(item.Value.ConnectionId).refreshChatWith(newAgent.Value.UserName, cumtomerId);
            }
            _db.Sessions.Add(new Session
            {
                AgentName = newAgent.Key,
                CustomerName = customerName,
                CreatedDateTime = DateTime.Now,
                Parent = _db.Sessions.Where(item => item.AgentName.Equals(currentAgent.Key)
                      && item.CustomerName.Equals(customerName)).OrderByDescending(item => item.Id).FirstOrDefault()
            });
            _db.SaveChanges();
        }

   [HubName("chatHub")]
    public class ChatHub : Microsoft.AspNet.SignalR.Hub
    {
        private readonly ApplicationDbContext _db = new ApplicationDbContext();
        private static ConcurrentDictionary<string, UserInformation> _agents;
        private static List<ChatSessionVm> _chatSessions;
        private readonly JsonSerializerSettings _settings = new JsonSerializerSettings
        {
            ContractResolver = new CamelCasePropertyNamesContractResolver(),
            ReferenceLoopHandling = ReferenceLoopHandling.Ignore
        };
        public void Init()
        {
            _chatSessions = _chatSessions ?? (_chatSessions = new List<ChatSessionVm>());
            _agents = _agents ?? (_agents = new ConcurrentDictionary<string, UserInformation>());
            Clients.Caller.onlineStatus(_agents.Count(x => x.Value.IsOnline) > 0);
        }
        public void AgentConnect(string userName)
        {
            //ما برای ساده کردن مقایسه ساده ای انجام دادیم فقط کاربر حسین یا علی میتواند کارشناس باشد
            if (userName == "hossein" || userName == "ali")
            {
                var agent = new UserInformation();
                if (_agents.Any(item => item.Key == userName))
                {
                    agent = _agents[userName];
                    agent.ConnectionId = Context.ConnectionId;
                }
                else
                {
                    agent.ConnectionId = Context.ConnectionId;
                    agent.UserName = userName;
                    agent.IsOnline = true;
                    _agents.TryAdd(userName, agent);

                }
                Clients.Caller.loginResult(true, agent.ConnectionId, agent.UserName);
                Clients.All.onlineStatus(_agents.Count(x => x.Value.IsOnline) > 0);
            }
            else
            {
                Clients.Caller.loginResult(false, null, null);
            }
        }
        public void AgentChangeStatus(bool status)
        {
            var agent = _agents.FirstOrDefault(x => x.Value.ConnectionId == Context.ConnectionId).Value;
            if (agent == null) return;
            agent.IsOnline = status;
            Clients.All.onlineStatus(_agents.Count(x => x.Value.IsOnline) > 0);
        }
        public void LogVisit(string city, string country, string firstComment, string userName)
        {
            foreach (var agent in _agents)
            {
                Clients.Client(agent.Value.ConnectionId).newVisit(userName, city, country, null, Context.ConnectionId, firstComment);
            }
        }
        public void AcceptRequestChat(string customerConnectionId, string body, string userName)
        {
            var agent = FindAgent(Context.ConnectionId);
            var session = _chatSessions.FirstOrDefault(item => item.Key.Equals(agent.Key));
            if (session == null)
            {
                _chatSessions.Add(new ChatSessionVm
                {
                    Key = agent.Key,
                    Value = new List<string> { customerConnectionId }
                });
            }
            else
            {
                session.Value.Add(customerConnectionId);
            }
            Clients.Client(Context.ConnectionId).agentChat(customerConnectionId, body, userName);
            Clients.Client(customerConnectionId).clientChat(customerConnectionId, agent.Value.UserName);
            foreach (var item in _agents.Where(item => item.Value.IsOnline))
            {
                Clients.Client(item.Value.ConnectionId).refreshChatWith(agent.Value.UserName, customerConnectionId);
            }
            _db.Sessions.Add(new Session
            {
                AgentName = agent.Key,
                CustomerName = userName,
                CreatedDateTime = DateTime.Now
            });
            _db.SaveChanges();

            var message = new Message
            {
                CreationTime = DateTime.Now,
                Sender = agent.Key,
                Receiver = userName,
                Body = body,
                //ConnectionId = _agents.FirstOrDefault(item => item.Value.UserName == userName).Key,
                Session = _db.Sessions.OrderByDescending(item => item.Id)
                .FirstOrDefault(item => item.AgentName.Equals(agent.Key) && item.CustomerName.Equals(userName))
            };
            _db.Messages.Add(message);
            _db.SaveChanges();
        }
        public void GetAgentHistoryChat(string userName)
        {
            var dic = new Dictionary<int, int>();
            var lenght = 0;
            var chats = _db.Sessions.OrderBy(item => item.Id).Include(item => item.Parent)
                .Where(item => item.AgentName.Equals(userName)).ToList();

            foreach (var session in chats)
            {
                Result(session, ref lenght);
                dic.Add(session.Id, lenght);
                lenght = 0;
            }
            if (!chats.Any()) return;

            var historyResult = chats.Select(item => new AgentViewModel
            {
                Id = item.Id,
                CustomerName = item.CustomerName,
                Date = item.CreatedDateTime,
                Lenght = dic.Any(di => di.Key.Equals(item.Id)) ? dic.FirstOrDefault(di => di.Key.Equals(item.Id)).Value : 0,
            }).OrderByDescending(item => item.Id).ToList();
            Clients.Caller.receiveHistory(JsonConvert.SerializeObject(historyResult, new Formatting(), _settings));
        }
        public void DetailsSessoinMessage(int sessionId, string agentId)
        {
            var session = _db.Sessions.FirstOrDefault(item => item.Id.Equals(sessionId));
            if (session == null) return;
            var list = new List<Message>();
            GetAllMessages(session, list);
            var result = JsonConvert.SerializeObject(list.OrderBy(item => item.Id), new Formatting(), _settings);
            Clients.Client(Context.ConnectionId).detailsHistory(result);
        }
        public void ClientSendMessage(string body, string userName)
        {
            var session = _chatSessions.FirstOrDefault(item => item.Value.Contains(Context.ConnectionId));
            if (session == null || session.Key == null) return;
            var agentId = _agents.FirstOrDefault(item => item.Key.Equals(session.Key)).Value.ConnectionId;
            Clients.Caller.clientAddMessage("من", body);
            Clients.Client(agentId).addMessage(Context.ConnectionId, userName, body);
            var message = new Message
            {
                Sender = FindAgent(agentId).Key,
                Receiver = userName,
                Body = body,
                CreationTime = DateTime.Now,
                Session = FindSession(userName, FindAgent(agentId).Key)
            };
            _db.Messages.Add(message);
            _db.SaveChanges();
        }
        public void AgentSendMessage(string id, string body, string userName)
        {
            var agent = FindAgent(Context.ConnectionId);
            Clients.Caller.addMessage(id, agent.Value.UserName, body);
            Clients.Client(id).clientAddMessage(agent.Value.UserName, body);
            var message = new Message
            {
                Sender = agent.Key,
                Receiver = userName,
                Body = body,
                Session = FindSession(agent.Key, userName),
                CreationTime = DateTime.Now
            };
            _db.Messages.Add(message);
            _db.SaveChanges();
        }
        public void CloseChat(string id)
        {
            var findAgent = FindAgent(Context.ConnectionId);
            var session = _chatSessions.FirstOrDefault(item => item.Value.Contains(id));
            if (session == null) return;
            Clients.Client(id).clientAddMessage(findAgent.Key, "مکالمه شما با کارشناس مربوطه به اتمام رسیده است");

            foreach (var agent in _agents)
            {
                Clients.Client(agent.Value.ConnectionId).refreshLeaveChat(agent.Value.UserName, id);
            }
            _chatSessions.Remove(session);
        }
        public void RequestChat(string message)
        {
            Clients.Caller.clientAddMessage("من", message);
        }
        public void EngageVisitor(string newAgentId, string cumtomerId, string customerName,string clientSessionId)
        {
            #region remove session of current agent
            var currentAgent = FindAgent(Context.ConnectionId);
            var currentSession = _chatSessions.FirstOrDefault(item => item.Value.Contains(cumtomerId));
            if (currentSession != null)
            {
                _chatSessions.Remove(currentSession);
            }
            #endregion

            #region add  session to new agent
            var newAgent = FindAgent(newAgentId);
            var newSession = _chatSessions.FirstOrDefault(item => item.Key.Equals(newAgent.Key));
            if (newSession == null)
            {
                _chatSessions.Add(new ChatSessionVm
                {
                    Key = newAgent.Key,
                    Value = new List<string> { cumtomerId }
                });
            }
            else
            {
                newSession.Value.Add(cumtomerId);
            }
            #endregion

            Clients.Client(currentAgent.Value.ConnectionId).addMessage(cumtomerId, newAgent.Key,
                "ادامه مکالمه به کارشناس  " + newAgent.Key + "مقابل  منتقل شد");
            Clients.Client(newAgentId).addMessage(cumtomerId, currentAgent.Key,
                "لطفا مکالمه را ادامه دهید.با تشکر");

            Clients.Client(cumtomerId).clientAddMessage(newAgent.Value.UserName,
                "مکالمه شما با کارشناس زیر برقرار گردید" + newAgent.Key);

            var session = _db.Sessions.FirstOrDefault
                (item => item.AgentName.Equals(currentAgent.Value.UserName)
                 && item.CustomerName.Equals(customerName));
            if (session != null)
            {
                var sessionId = session.Id;
                var messages = _db.Messages.Where(item => item.Session.Id.Equals(sessionId));
                var result = JsonConvert.SerializeObject(messages, new Formatting(), _settings);
                Clients.Client(newAgentId).visitorSwitchConversation
                    (Context.ConnectionId, customerName, result, clientSessionId);
            }
            foreach (var item in _agents.Where(item => item.Value.IsOnline))
            {
                Clients.Client(item.Value.ConnectionId).refreshChatWith(newAgent.Value.UserName, cumtomerId);
            }
            _db.Sessions.Add(new Session
            {
                AgentName = newAgent.Key,
                CustomerName = customerName,
                CreatedDateTime = DateTime.Now,
                Parent = _db.Sessions.Where(item => item.AgentName.Equals(currentAgent.Key)
                      && item.CustomerName.Equals(customerName)).OrderByDescending(item => item.Id).FirstOrDefault()
            });
            _db.SaveChanges();
        }
        public void ShowAgentList()
        {
            Clients.Caller.agentList(_agents.ToList());
        }
        public override Task OnDisconnected(bool stopCalled)
        {
            var id = Context.ConnectionId;
            var isAgent = _agents != null && _agents.Any(item => item.Value.ConnectionId.Equals(id));
            if (isAgent)
            {
                UserInformation agent;
                var currentAgentConnectionId = FindAgent(id).Key;
                if (currentAgentConnectionId == null)
                    return base.OnDisconnected(stopCalled);
                if (_chatSessions.Any())
                {
                    var sessions = _chatSessions.FirstOrDefault(item => item.Key.Equals(currentAgentConnectionId));
                    //اطلاع دادن به تمام کاربرانی که در حال مکالمه با کارشناس هستند
                    if (sessions != null)
                    {
                        var result = sessions.Value.ToList();
                        for (var i = 0; i < result.Count(); i++)
                        {
                            var localId = result[i];
                            Clients.Client(localId).clientAddMessage(currentAgentConnectionId, "ارتباط شما با مشاور مورد نظر قطع شده است");
                        }
                    }
                }
                _agents.TryRemove(currentAgentConnectionId, out agent);
                Clients.All.onlineStatus(_agents.Count(x => x.Value.IsOnline) > 0);
                Clients.Client(id).loginResult(false, null, null);
            }
            else
            {
                if (_chatSessions == null ||
                    !_chatSessions.Any(item => item.Value.Contains(id)
                        && _agents == null))
                    return base.OnDisconnected(stopCalled);

                var session = _chatSessions.FirstOrDefault(item => item.Value.Contains(id));
                if (session == null)
                    return base.OnDisconnected(stopCalled);

                var agentName = session.Key;
                var agent = _agents.FirstOrDefault(item => item.Key.Equals(agentName));
                if (agent.Key != null)
                {
                    Clients.Client(agent.Value.ConnectionId).addMessage(id, "کاربر", "اتصال با کاربر قطع شده است");
                }
            }
            return base.OnDisconnected(stopCalled);
        }


        private KeyValuePair<string, UserInformation> FindAgent(string connectionId)
        {
            return _agents.FirstOrDefault(item => item.Value.ConnectionId.Equals(connectionId));
        }
        private Session FindSession(string key, string userName)
        {
            return _db.Sessions.Where(item => item.AgentName.Equals(key) && item.CustomerName.Equals(userName))
                .OrderByDescending(item => item.Id).FirstOrDefault();
        }
        private static void Result(Session parent, ref int lenght)
        {
            while (true)
            {
                if (parent == null)
                    return;
                lenght += parent.Messages.Count();
                parent = parent.Parent;
            }
        }
        private static List<Message> GetAllMessages(Session node, List<Message> list)
        {
            if (node == null) return null;
            list.AddRange(node.Messages);
            if (node.Parent != null)
            {
                GetAllMessages(node.Parent, list);
            }
            return null;
        }
    }

<div>
    <div>
        <h2>
            خوش آمدید
            <span ng-bind="agent.name">
            </span>
            <a ng-click="changeAgentStatus()">
                <i ng-if="changeStatus==null"
                   data-placement="bottom"
                   data-trigger="hover "
                   bs-tooltip="options.lock"></i>
                <i ng-if="changeStatus==true"
                   data-placement="bottom"
                   data-trigger="hover"
                   bs-tooltip="options.unlock"></i>
            </a>
        </h2>
        <div style="float: left">
            <a ng-click="setAlarm()">
                <i ng-show="alarmStatus"
                   data-placement="bottom"
                   data-trigger="hover "
                   bs-tooltip="options.alarmOn"></i>

                <i ng-show="!alarmStatus"
                   data-placement="bottom"
                   data-trigger="hover "
                   bs-tooltip="options.alarmOff"></i>
            </a>
            <!--<a data-placement="bottom"
               data-trigger="hover "
               bs-tooltip="options.conversion" ng-click="showHistory()"><i></i></a>-->

            <a data-placement="bottom"
               data-trigger="hover "
               bs-tooltip="options.edit"><i></i><span></span></a>

            <a data-placement="bottom"
               data-trigger="hover "
               bs-tooltip="options.setting"><i></i></a>

            <a data-placement="bottom"
               data-trigger="hover "
               bs-tooltip="options.signOut" ng-click="LeaveChat()"><i></i><span></span></a>
        </div>
    </div>
    <div>
        <div>
            <div id="chat-content">
                <div>
                    <ul>
                        <li>
                            <a showtab href="#online-list">آنلاین</a>
                        </li>
                        <li>
                            <a ng-click="showHistory()" showtab href="#conversation">آرشیو گفتگوها</a>
                        </li>
                    </ul>
                    <div>
                        <div id="online-list">
                            <div>
                                <h2>
                                    <i></i><span></span>
                                    <span>نمایش آنلاین مراجعه ها</span>
                                </h2>
                            </div>
                            <div>
                                <div id="agent-chat">
                                    <div id="real-time-visits">
                                        <table id="current-visits">
                                            <thead>
                                                <tr>
                                                    <th>نام کاربر</th>
                                                    <th>زمان اولین تقاضا</th>
                                                    <th>منطقه</th>
                                                    <th>پاسخ</th>
                                                </tr>
                                            </thead>
                                            <tbody>
                                                <tr id="{{item.connectionId}}" ng-animate="animate" ng-repeat="item in customerVisit ">
                                                    <td ng-bind="item.userName"></td>
                                                    <td>
                                                        <span time-ago title="{{item.date}}"></span>
                                                    </td>
                                                    <td>
                                                        <span ng-bind="item.country"></span> /<span ng-bind="item.city"> </span>
                                                    </td>
                                                    <td>
                                                        <a style="cursor: pointer" ng-if="item.chatWith== null"
                                                           ng-click="acceptRequestChat(item.connectionId,item.firstComment,item.userName)">
                                                            شروع مکالمه
                                                        </a>
                                                        <span ng-if="item.chatWith ">
                                                            وضعیت:
                                                            <span>در حال مکالمه با</span>
                                                            <span ng-bind="item.chatWith"></span>
                                                            <a ng-show="item.chatWith==agent.name"
                                                              
                                                               ng-click="selectVisitor(item.connectionId,item.userName,item.connectionId)">
                                                                انتقال مکالمه
                                                            </a>
                                                        </span>
                                                        <ul ng-repeat="session in chatSessions track by $index" style="padding:0px;">
                                                            <li ng-if="session.id==item.connectionId" id="{{session.id}}">
                                                                <div>
                                                                    <p>
                                                                        تاریخ شروع مکالمه:
                                                                        <span time-ago title="{{session.date}}"></span>
                                                                    </p>
                                                                    <p>
                                                                        تعداد پیام ها:
                                                                        <span ng-bind="session.length"></span>
                                                                    </p>
                                                                </div>
                                                                <p>
                                                                    <a ng-click="detailsChat(session.id,session.userName)">جزییات </a>
                                                                    <a ng-click="closeChat(session.id)">
                                                                        خاتمه عملیات
                                                                    </a>
                                                                </p>
                                                            </li>
                                                        </ul>
                                                    </td>
                                                </tr>
                                            </tbody>
                                        </table>
                                    </div>
                                </div>
                            </div>
                        </div>
                        <div id="conversation">
                            <div>
                                <h2>
                                    <i></i><span></span>
                                    <span>آرشیو گفتگوهای </span>
                                    {{agent.name}}
                                </h2>
                            </div>
                            <div>
                                <div>
                                    <table id="current-visits">
                                        <thead>
                                            <tr>
                                                <th>شناسه مشتری</th>
                                                <th>نام مشتری</th>
                                                <th>تعداد محاوره ها</th>
                                                <th>تاریخ</th>
                                                <th>جزئیات</th>
                                            </tr>
                                        </thead>
                                        <tbody>
                                            <tr ng-repeat="item in agentHistory track by $index">
                                                <td ng-bind="item.id"></td>
                                                <td ng-bind="item.customerName"></td>
                                                <th ng-bind="item.lenght"></th>
                                                <td><span time-ago title="{{item.date}}"></span></td>
                                                <th>
                                                    <ang-click="detailsChatHistory(item.id)" >مشاهده جزییات گفتگو</a>
                                                </th>
                                            </tr>
                                        </tbody>
                                    </table>
                                </div>
                            </div>
                        </div>
                    </div>
                </div>
            </div>
        </div>
    </div>
    <div id="detailsAgentHistory" tabindex="-1" role="dialog" aria-labelledby="cmdLabel" aria-hidden="true">
        <div>
            <div>
                <div>
                    <div>
                        <button type="button" data-dismiss="modal" aria-hidden="true">×</button>
                    </div>
                    <h2>
                        <span></span>تاریخچه گفتگو
                    </h2>
                </div>
                <div>
                    <div style="display: block">
                        <ul ng-repeat="item in historyMsg">
                            <li>
                                <span ng-bind="item.name" ng-style="setdirectionClass(item.name)">
                                </span>
                                <span ng-style="setdirectionClass(item.name)">
                                    <span ng-class="setArrowClass(item.name)"></span>
                                    <span time-ago title="{{item.date}}"></span>
                                    <span>
                                        <p ng-bind-html="item.msg | smilies"></p>
                                    </span>
                                </span>
                            </li>
                        </ul>
                    </div>

                </div>
            </div>
        </div>
    </div>
    <div id="agentList" tabindex="-1" role="dialog" aria-labelledby="cmdLabel" aria-hidden="true">
        <div>
            <div>
                <div>
                    <div>
                        <button type="button" data-dismiss="modal" aria-hidden="true">×</button>
                    </div>
                    <h2>
                        <span></span>لیست تمام کارشناسان
                    </h2>
                </div>
                <div>
                    <div style="display: block;">
                        <div ng-show="agentList.length==0">
                            کارشناس آنلاینی وجود ندارد
                        </div>
                        <ul ng-repeat="item in agentList">
                            <li>
                                <span>
                                    <a ng-click="engageVisitor(item.id)">{{item.name}}</a>
                                </span>
                            </li>
                        </ul>
                    </div>
                </div>
            </div>
        </div>
    </div>
    <div id="agentUserChat"  tabindex="-1" role="dialog" aria-labelledby="cmdLabel" aria-hidden="true">
        <div>
            <div>
                <div>
                    <div>
                        <button type="button" data-dismiss="modal" aria-hidden="true">×</button>
                    </div>
                    <h2>
                        <span></span>گفتگو
                    </h2>
                </div>
                <div>
                    <div>
                        <div>
                            <div style="display: block;">
                                <label>شروع چت در </label>:
                                <span ng-bind="dateStartChat"></span>

                                <ul>
                                    <li ng-repeat="item in agentUserMsgs">
                                        <span ng-bind="item.name" ng-style="setdirectionClass(item.name)">

                                        </span>
                                        <span ng-style="setdirectionClass(item.name)">
                                            <span ng-class="setArrowClass(item.name)"></span>
                                            <span time-ago title="{{item.date}}"></span>

                                            <span>
                                                <p ng-bind-html="item.msg | smilies"></p>
                                            </span>
                                        </span>
                                    </li>
                                </ul>
                                <div>
                                    <div>
                                        <textarea id="post-msg" ng-model="msg" placeholder="متن خود را وارد نمایید" style="overflow: hidden; word-wrap: break-word; resize: horizontal; height: 80px; max-width: 100%"></textarea>
                                        <span smilies-selector="msg" smilies-placement="right" smilies-title="Smilies"></span>
                                    </div>
                                    <div style="text-align: center; margin-top: 5px">
                                        <button ng-click="agentMsgToUser(msg)">ارسال</button>
                                    </div>
                                </div>
                            </div>
                        </div>
                    </div>
                </div>
            </div>
        </div>
    </div>
</div>

public class DBLog
    {
        public int  DBLogId { get; set; }
        public string? LogLevel { get; set; }
        public string? EventName { get; set; }
        public string? Message { get; set; }
        public string? StackTrace { get; set; }
        public DateTime CreatedDate { get; set; }=DateTime.Now;
    }

public class DbLoggerProvider:ILoggerProvider
    {
        private bool _isDisposed;
        private readonly ApplicationDbContext _dbContext;
        public DbLoggerProvider(ApplicationDbContext dbContext)
        {
            _dbContext = dbContext ?? throw new ArgumentNullException(nameof(dbContext));
        }

        public ILogger CreateLogger(string categoryName)
        {
            return new D‌BLogger(_dbContext);
        }

        public void Dispose()
        {
        }
    }  
 

همانطور که ملاحظه می‌نمایید، این لاگ پروایدر، از اینترفیس ILoggerProvider ارث بری کرده‌است که دارای متد CreateLogger می‌باشد ئ این متد با شروع برنامه، یک نمونه از دیتابیس لاگر سفارشی ما را ایجاد می‌کند. در سازنده‌ی این کلاس، DatabaseContext را مقدار دهی نموده‌ایم تا آنرا به کلاس DBLogger ارسال نماییم.