private async Task Connect()
{
if (_hubConnection != null)
{
if (_hubConnection.State != ConnectionState.Disconnected)
{
return;
}
// Dispose/Stop the old connection on a bg thread, we don't care about it anymore
var oldConnection = _hubConnection;
Task.Run(() => oldConnection.Dispose()).Forget();
}
Status = "Connecting...";
// The DispatchingHubConnection will execute all callbacks via the Dispatcher (UI thread)
// so the need for locking and posting is drastically reduced.
_hubConnection = new DispatchingHubConnection(_hubUrl, Dispatcher);
// Enable tracing
_hubConnection.TraceLevel = TraceLevels.All;
_hubConnection.TraceWriter = new CollectionTraceWriter(LogMessages, Dispatcher);
// Handle the connection lifetime events
_hubConnection.Reconnecting += () =>
{
if (_hubConnection.State == ConnectionState.Reconnecting)
{
CanSend = false;
Status = "Connection reconnecting...";
}
};
_hubConnection.Reconnected += () =>
{
if (_hubConnection.State == ConnectionState.Connected)
{
Status = string.Format("Connected to {0} via {1}", _hubUrl, _hubConnection.Transport.Name);
CanSend = true;
}
};
_hubConnection.Closed += async() =>
{
if (_hubConnection.State == ConnectionState.Disconnected)
{
CanSend = false;
Status = "Connection lost, reconnecting in a bit...";
await Task.Delay(_reconnectDelay);
await Connect();
}
};
_hubConnection.Error += ex =>
{
LogMessages.Add(ex.ToString());
};
_hubProxy = _hubConnection.CreateHubProxy("chat");
_hubProxy.On <string>("userJoined", userName =>
{
Messages.Add(new Message(string.Format("{0} joined", userName)));
});
_hubProxy.On <string, string>("newMessage", (userName, message) =>
{
Messages.Add(new Message(message, userName));
});
while (true)
{
try
{
// HTTP streaming transports don't work well on the Windows Phone stack so we force long polling.
// We're adding support for WebSockets to Windows Store/Phone 8.1 apps in SignalR 2.2.0
await _hubConnection.Start(new LongPollingTransport());
if (_hubConnection.State == ConnectionState.Connected)
{
Status = string.Format("Connected to {0} via {1}", _hubUrl, _hubConnection.Transport.Name);
CanSend = true;
break;
}
}
catch (Exception)
{
Status = string.Format("Connecting to {0} failed, trying again in a bit", _hubUrl);
}
await Task.Delay(_reconnectDelay);
}
}
private async Task Connect()
{
if (_hubConnection != null)
{
if (_hubConnection.State != ConnectionState.Disconnected)
{
return;
}
// Dispose/Stop the old connection on a bg thread, we don't care about it anymore
var oldConnection = _hubConnection;
Task.Run(() => oldConnection.Dispose()).Forget();
}
Status = "Connecting...";
// The DispatchingHubConnection will execute all callbacks via the Dispatcher (UI thread)
// so the need for locking and posting is drastically reduced.
_hubConnection = new DispatchingHubConnection(_hubUrl, Dispatcher);
// Enable tracing
_hubConnection.TraceLevel = TraceLevels.All;
_hubConnection.TraceWriter = new CollectionTraceWriter(LogMessages, Dispatcher);
// Handle the connection lifetime events
_hubConnection.Reconnecting += () =>
{
if (_hubConnection.State == ConnectionState.Reconnecting)
{
CanSend = false;
Status = "Connection reconnecting...";
}
};
_hubConnection.Reconnected += () =>
{
if (_hubConnection.State == ConnectionState.Connected)
{
Status = string.Format("Connected to {0} via {1}", _hubUrl, _hubConnection.Transport.Name);
CanSend = true;
}
};
_hubConnection.Closed += async () =>
{
if (_hubConnection.State == ConnectionState.Disconnected)
{
CanSend = false;
Status = "Connection lost, reconnecting in a bit...";
await Task.Delay(_reconnectDelay);
await Connect();
}
};
_hubConnection.Error += ex =>
{
LogMessages.Add(ex.ToString());
};
_hubProxy = _hubConnection.CreateHubProxy("chat");
_hubProxy.On<string>("userJoined", userName =>
{
Messages.Add(new Message(string.Format("{0} joined", userName)));
});
_hubProxy.On<string, string>("newMessage", (userName, message) =>
{
Messages.Add(new Message(message, userName));
});
while (true)
{
try
{
// HTTP streaming transports don't work well on the Windows Phone stack so we force long polling.
// We're adding support for WebSockets to Windows Store/Phone 8.1 apps in SignalR 2.2.0
await _hubConnection.Start(new LongPollingTransport());
if (_hubConnection.State == ConnectionState.Connected)
{
Status = string.Format("Connected to {0} via {1}", _hubUrl, _hubConnection.Transport.Name);
CanSend = true;
break;
}
}
catch (Exception)
{
Status = string.Format("Connecting to {0} failed, trying again in a bit", _hubUrl);
}
await Task.Delay(_reconnectDelay);
}
}
