Service Fabric AspNet Core 3.1 Autofac WebHostBuilder

Question

我有 Service Fabric 无状态 asp.net core 2.2 应用程序。我试图将其升级到 asp.net core 3.1。我正在使用 autofac 依赖注入容器。根据 autofac 文档 DI 注册已移动 从 WebHostBuilder 到通用 HostBuilder https://autofaccn.readthedocs.io/en/latest/integration/aspnetcore.html#asp-net-core-3-0-and-generic-hosting。但是 Service Fabric 不支持 asp.net core Generic Host https://github.com/microsoft/service-fabric-aspnetcore/issues/48。

有没有其他方法在WebHostBuilder中注册Autofac？

Answer 1

我认为官方的立场是您应该自己提供通用主机实现 (https://github.com/Microsoft/service-fabric-aspnetcore/issues/48)

不过，我确实认为我有一个适合您的解决方法（我自己刚开始使用它）。您需要对其进行修改以配置您所做的任何事情，但重要的一行是services.Replace(ServiceDescriptor.Singleton<IServiceProviderFactory<ContainerBuilder>>(new AutofacServiceProviderFactory(null)));

protected override IEnumerable<ServiceInstanceListener> CreateServiceInstanceListeners()
{
    return new[]
    {
        new ServiceInstanceListener(
            serviceContext => new KestrelCommunicationListener(
                serviceContext,
                (url, listener) =>
                    {
                        return WebHost
                            .CreateDefaultBuilder()
                            .ConfigureServices(services =>
                            {
                                services.Replace(ServiceDescriptor.Singleton<IServiceProviderFactory<ContainerBuilder>>(new AutofacServiceProviderFactory(null)));
                                services.AddSingleton(serviceContext)
                            })
                            .UseServiceFabricIntegration(listener, ServiceFabricIntegrationOptions.UseUniqueServiceUrl | ServiceFabricIntegrationOptions.UseReverseProxyIntegration)
                            .UseStartup<TStartupType>()
                            .Build();
                    }))
    };
}