private void ResolveTransport(IConnection connection, string data, TaskCompletionSource <object> tcs, int index)
{
// Pick the current transport
IClientTransport transport = _transports[index];
transport.Start(connection, data).ContinueWith(task =>
{
if (task.IsFaulted)
{
// Make sure we observe the exception
var ex = task.Exception;
#if !WINDOWS_PHONE && !SILVERLIGHT && !NETFX_CORE
Trace.TraceError("SignalR exception thrown by Task: {0}", ex);
#endif
#if NET35
Debug.WriteLine(System.String.Format(System.Globalization.CultureInfo.InvariantCulture, "Auto: Failed to connect to using transport {0}", (object)transport.GetType().Name));
#else
Debug.WriteLine("Auto: Failed to connect to using transport {0}", (object)transport.GetType().Name);
#endif
// If that transport fails to initialize then fallback
var next = index + 1;
if (next < _transports.Length)
{
// Try the next transport
ResolveTransport(connection, data, tcs, next);
}
else
{
// If there's nothing else to try then just fail
tcs.SetException(task.Exception);
}
}
else
{
// Set the active transport
_transport = transport;
// Complete the process
tcs.SetResult(null);
}
});
}
