连接 Azure IoT 中心时在 macOS 上的 MAUI 中抛出 PlatformNotSupportedException

Question

我正在 macOS 上探索 MAUI。我正在移植 WPF 应用程序来评估功能。该应用程序正在连接到一个 Azure IoT Hub 实例。

这是似乎有问题的代码部分：

var iotHubConnectionStringBuilder = IotHubConnectionStringBuilder.Create("HostName=<iotHubConnectionString>");

var registryManager = RegistryManager.CreateFromConnectionString(iotHubConnectionStringBuilder.ToString());

调用CreateFromConnectionString时抛出如下异常：

    Unhandled Exception:
           System.PlatformNotSupportedException: Operation is not supported on this platform.
at System.Net.Http.NSUrlSessionHandler.set_SslProtocols(SslProtocols value)
at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
--- End of stack trace from previous location ---
at System.Net.Http.HttpClientHandler.InvokeNativeHandlerMethod(String name, Object[] parameters)
at System.Net.Http.HttpClientHandler.SetSslProtocols(SslProtocols value)
at System.Net.Http.HttpClientHandler.set_SslProtocols(SslProtocols value)
at Microsoft.Azure.Devices.Client.Transport.HttpClientHelper..ctor(Uri baseAddress, IAuthorizationProvider authenticationHeaderProvider, IDictionary`2 defaultErrorMapping, TimeSpan timeout, Action`1 preRequestActionForAllRequests, X509Certificate2 clientCert, HttpClientHandler httpClientHandler, ProductInfo productInfo, IWebProxy proxy, Boolean isClientPrimaryTransportHandler)
at Microsoft.Azure.Devices.Client.Transport.HttpTransportHandler..ctor(IPipelineContext context, IotHubConnectionString iotHubConnectionString, Http1TransportSettings transportSettings, HttpClientHandler httpClientHandler, Boolean isClientPrimaryTransportHandler)
at Microsoft.Azure.Devices.Client.InternalClient..ctor(IotHubConnectionString iotHubConnectionString, ITransportSettings[] transportSettings, IDeviceClientPipelineBuilder pipelineBuilder, ClientOptions options)
at Microsoft.Azure.Devices.Client.ClientFactory.CreateFromConnectionString(String connectionString, IAuthenticationMethod authenticationMethod, ITransportSettings[] transportSettings, IDeviceClientPipelineBuilder pipelineBuilder, ClientOptions options)
at Microsoft.Azure.Devices.Client.ClientFactory.CreateFromConnectionString(String connectionString, IAuthenticationMethod authenticationMethod, TransportType transportType, IDeviceClientPipelineBuilder pipelineBuilder, ClientOptions options)
at Microsoft.Azure.Devices.Client.ClientFactory.CreateFromConnectionString(String connectionString, TransportType transportType, ClientOptions options)
at Microsoft.Azure.Devices.Client.ClientFactory.CreateFromConnectionString(String connectionString, ClientOptions options)
at Microsoft.Azure.Devices.Client.DeviceClient.<>c__DisplayClass8_0.<CreateFromConnectionString>b__0()
at Microsoft.Azure.Devices.Client.DeviceClient.Create(Func`1 internalClientCreator)
at Microsoft.Azure.Devices.Client.DeviceClient.CreateFromConnectionString(String connectionString, ClientOptions options)
[..]

我试过不同的 HttpClient 实现，但没有任何积极的结果。而且，令人惊讶的是，它展示了相同的调用堆栈，上面有 NSUrlSessionHandler.set_SslProtocols：

问题

为什么会抛出这个错误，如何修复？

Answer 1

我为 Mac 版本 17.3 Preview 1 使用 Visual Studio 2022。在 Mac v17.3 Preview 1.1 以及 .net MAUI 工作负载更新到 Visual Studio 2022 后，它起作用了。

我让 HttpClient 实现到 NSUrlSession。

我不确定为什么它现在可以正常工作的确切原因，但我认为这些问题在使用预览产品时肯定会发生。

连接 Azure IoT 中心时在 macOS 上的 MAUI 中抛出 PlatformNotSupportedException

PlatformNotSupportedException thrown in MAUI on macOS when connecting Azure IoT Hub

c#

.net

azure-iot-hub

maui

.net-maui