从睡眠中恢复时应用崩溃

Question

我正在使用 xamarin 进行跨平台应用开发。我们使用asure移动服务连接数据库。基本上这个应用程序是用于聊天的，所以我们在.NET Framework中使用了 SignalR 。当应用程序在60秒之后的一段时间内从睡眠状态进入时会崩溃。有没有办法使用 SignalR 连接回来.Issue似乎与 SignalR 。我在哪里需要更新客户端或服务器端的代码。 客户端代码

public class SignalRClient
    {
        private  static string CONNECTION_URL = "http://";
        private static TimeSpan CONNECT_TIMEOUT = new TimeSpan(0, 0, 30); 
        private readonly  HubConnection _hubConnection;
        private  readonly IHubProxy _chatHubProxy;
        private static string AuthToken = "";
        public  string UserID;
        public event SignalRConnectionStateChangedDelegate SignalRConnectionStateChangedEvent;

        public SignalRClient(string authToken)
        {

            AuthToken = authToken;

            _hubConnection = new HubConnection(CONNECTION_URL);
            _hubConnection.Headers["xauth"] = AuthToken;
            _hubConnection.TransportConnectTimeout = CONNECT_TIMEOUT;
            _hubConnection.Error += ex =>
            {
                if (SignalRConnectionStateChangedEvent != null)
                {

                    _hubConnection.Stop();
                    SignalRConnectionStateChangedEvent("Error :" + ex.Message);
                }
            };

            _chatHubProxy = _hubConnection.CreateHubProxy("ChatServer");

        }

        public async Task Connect(string UserID)
        {

            if (_hubConnection.State != ConnectionState.Connected)
            {

                try
                {
                    await _hubConnection.Start();

                    _hubConnection.StateChanged += (connectionState) =>
                    {
                        if (SignalRConnectionStateChangedEvent != null)
                        {
                            SignalRConnectionStateChangedEvent(connectionState.NewState.ToString().ToLower());
                        }
                    };
                } 
                catch (Exception ex)
                {
                    var message = ex.Message;
                }