Wie verbinde ich mich vom Xamarin-Client zum SignalR-Server?

Question

(**) Ich habe einen ASP.NET-Webserver erstellt, der den SignalR-Hub hostet. Ich folgte this Tutorial. Es klappt. Dann habe ich einen Xamarin.Android Client (*) erstellt. Das Problem ist, dass ich keine Verbindung zum Server herstellen kann. Ich denke, ich kann wegen "localhost" in meiner Host-Adresse nicht verbunden werden. Die Ausnahme ist ziemlich groß.

Wenn mein Verdacht richtig ist, wie kann ich umgehen? Wie kann ich localhost wie einen normalen Server aussehen lassen?

(*) - Ich habe auch mit Xamarin.Forms im Allgemeinen versucht.

(**) - Bitte sehen Sie sich die "EDIT" am Ende der Frage.

Dies ist meine Methode:

protected override void OnCreate(Bundle bundle) 
    { 
     base.OnCreate(bundle); 

     // Set our view from the "main" layout resource 
     SetContentView(Resource.Layout.Main); 

     // Get our button from the layout resource, 
     // and attach an event to it 
     Button button = FindViewById<Button>(Resource.Id.MyButton); 

     button.Click += async delegate 
     { 
      button.Text = string.Format("{0} clicks!", count++); 
      var hubConnection = new HubConnection("http://localhost:64642"); 
      var chatHubProxy = hubConnection.CreateHubProxy("ChatHub"); 
      try 
      { 
       // Start the connection 
       await hubConnection.Start(); 

       // Invoke the 'UpdateNick' method on the server 
       await chatHubProxy.Invoke("Send", new object[] { "TheMessage", "JohnDoe" }); 
      } 
      catch(Exception ex) 
      { 

      } 
     }; 
    } 

{System.Net.WebException: Error: ConnectFailure (Connection refused) ---> System.Net.Sockets.SocketException: Connection refused at System.Net.Sockets.Socket.Connect (System.Net.EndPoint remoteEP) [0x000cb] in /Users/builder/data/lanes/3511/77cb8568/source/mono/mcs/class/System/System.Net.Sockets/Socket.cs:1313 at System.Net.WebConnection.Connect (System.Net.HttpWebRequest request) [0x0019b] in /Users/builder/data/lanes/3511/77cb8568/source/mono/mcs/class/System/System.Net/WebConnection.cs:195 --- End of inner exception stack trace --- at System.Net.HttpWebRequest.EndGetResponse (System.IAsyncResult asyncResult) [0x0005e] in /Users/builder/data/lanes/3511/77cb8568/source/mono/mcs/class/System/System.Net/HttpWebRequest.cs:1023 at System.Threading.Tasks.TaskFactory 1[TResult].FromAsyncCoreLogic (System.IAsyncResult iar, System.Func 2[T,TResult] endFunction, System.Action 1[T] endAction, System.Threading.Tasks.Task 1[TResult] promise, System.Boolean requiresSynchronization) [0x00014] in /Users/builder/data/lanes/3511/77cb8568/source/mono/mcs/class/referencesource/mscorlib/system/threading/Tasks/FutureFactory.cs:550

--- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() [0x0000c] in /Users/builder/data/lanes/3511/77cb8568/source/mono/mcs/class/referencesource/mscorlib/system/runtime/exceptionservices/exceptionservicescommon.cs:143 at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x00047] in /Users/builder/data/lanes/3511/77cb8568/source/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:187 at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x0002e] in /Users/builder/data/lanes/3511/77cb8568/source/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:156 at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x0000b] in /Users/builder/data/lanes/3511/77cb8568/source/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:128 at System.Runtime.CompilerServices.ConfiguredTaskAwaitable`1+ConfiguredTaskAwaiter[TResult].GetResult () [0x00000] in /Users/builder/data/lanes/3511/77cb8568/source/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:535 at System.Net.Http.HttpClientHandler+c__async0.MoveNext() [0x003ce] in /Users/builder/data/lanes/3511/77cb8568/source/mono/mcs/class/System.Net.Http/System.Net.Http/HttpClientHandler.cs:379

--- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() [0x0000c] in /Users/builder/data/lanes/3511/77cb8568/source/mono/mcs/class/referencesource/mscorlib/system/runtime/exceptionservices/exceptionservicescommon.cs:143 at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x00047] in /Users/builder/data/lanes/3511/77cb8568/source/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:187 at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x0002e] in /Users/builder/data/lanes/3511/77cb8568/source/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:156 at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x0000b] in /Users/builder/data/lanes/3511/77cb8568/source/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:128 at System.Runtime.CompilerServices.ConfiguredTaskAwaitable`1+ConfiguredTaskAwaiter[TResult].GetResult () [0x00000] in /Users/builder/data/lanes/3511/77cb8568/source/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:535 at System.Net.Http.HttpClient+c__async0.MoveNext() [0x000a9] in /Users/builder/data/lanes/3511/77cb8568/source/mono/mcs/class/System.Net.Http/System.Net.Http/HttpClient.cs:276

--- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() [0x0000c] in /Users/builder/data/lanes/3511/77cb8568/source/mono/mcs/class/referencesource/mscorlib/system/runtime/exceptionservices/exceptionservicescommon.cs:143 at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x00047] in /Users/builder/data/lanes/3511/77cb8568/source/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:187 at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x0002e] in /Users/builder/data/lanes/3511/77cb8568/source/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:156 at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x0000b] in /Users/builder/data/lanes/3511/77cb8568/source/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:128 at System.Runtime.CompilerServices.TaskAwaiter.GetResult() [0x00000] in /Users/builder/data/lanes/3511/77cb8568/source/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:113 at AndroidApp.MainActivity+<>c__DisplayClass1_0+<b__0>d.MoveNext () [0x000a5] in C:\Data\Projects\SinglaRSamples\AndroidApp\AndroidApp\MainActivity.cs:36 }

EDIT:

als Maurer und Jason vorgeschlagen, ich muss wohl anstelle von "localhost" die richtige IP verwenden. Die IP, die Android Emulator den tatsächlichen localhost sehen. Ich habe Mühe, diese IP zu finden, irgendwo in Android-Einstellungen. Jede Hilfe wäre großartig!

Answer 1

Sie können über den Google SDK-Emulator auf die ASP.NET-Site zugreifen, die auf Ihrem PC-Host ausgeführt wird, indem Sie http://10.0.2.2:64642 verwenden. Wenn es nicht gelingt, den Server zu erreichen, müssen Sie wahrscheinlich die Windows-Firewall so konfigurieren, dass eingehende HTTP/HTTPS-Verbindungen zugelassen werden.