Xamarin Forms SignalR iOS Client not working after VS Mac 8.9 upgrade

Question

Hi - i have just upgraded visual studio

xamarin forms on iOS app SignalR Client isn't working:

        string token = s.AccessToken().Result;

        _connection = new HubConnectionBuilder()
          .WithUrl(serverUrl, options =>
          {
              options.AccessTokenProvider = () => Task.FromResult(token);
              options.Transports = Microsoft.AspNetCore.Http.Connections.HttpTransportType.LongPolling;

          })
          .WithAutomaticReconnect()
          .ConfigureLogging(logging =>
          {
              logging.AddDebug();
              logging.SetMinimumLevel(LogLevel.Debug);

          })
          .Build();

I am getting the following exception:

{System.TypeInitializationException: The type initializer for 'Microsoft.AspNetCore.SignalR.Protocol.JsonHubProtocol' threw an exception. ---> System.MissingMethodException: Method not found: int System.Text.Encodings.Web.TextEncoder.FindFirstCharacterToEncodeU…}

Please can you help / advise? This has broken my app and there doesn't seem to be away to roll back to an older version of VS.

xamarin forms - 5.0.0.2012

Xamarin.iOS
Version: 14.14.2.5

Xamarin.Android
Version: 11.2.0.0

Seems to work OK on Android.

Answer 1

Hi @SSB ,

It appears you're having the same issue as described in https://github.com/xamarin/xamarin-macios/issues/10548. The issue is still open, but I will see about getting an update.

Have you attempted using an offline install of a prior version? I see that installing previous versions of VS has been supported; https://developercommunity.visualstudio.com/t/please-provide-permanent-deterministic-public-link/353980, but not sure if it applies to VS on Mac. If you run into issues, I would suggest submitting feedback to the Visual Studio team.

Regards,
Ryan

Answer 2

guys, it looks like working fine with v4.5.0 of System.Memory.

<PackageReference Include="System.Memory">
  <Version>4.5.0</Version>
</PackageReference>