服务结构AspNet Core 3.1 Autofac WebHostBuilder [英] Service Fabric AspNet Core 3.1 Autofac WebHostBuilder

问题描述

我有服务结构无状态的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依赖项注入容器.根据autofac文档，DI注册已移动从WebHostBuilder到通用HostBuilder https://github.com/microsoft/service-fabric-aspnetcore/issues/48 .

I have service fabric stateless asp.net core 2.2 application. I trying to upgrade this to asp.net core 3.1. I am using autofac dependency injection container. As per autofac documentation DI registration moved from WebHostBuilder to Generic HostBuilder https://autofaccn.readthedocs.io/en/latest/integration/aspnetcore.html#asp-net-core-3-0-and-generic-hosting. But Service fabric doesn't support asp.net core Generic Host https://github.com/microsoft/service-fabric-aspnetcore/issues/48.

还有其他方法可以在WebHostBuilder中注册Autofac吗?

Is there any other way register Autofac in WebHostBuilder?

推荐答案

我认为官方立场是您应该自己提供通用主机实现(

I think the official stance is that you should provide the generic host implementation yourself (https://github.com/Microsoft/service-fabric-aspnetcore/issues/48)

但是，我确实认为我为您提供了一种解决方法(我自己才开始使用此方法).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)));

I do however think that I have a workaround for you (I just started using this myself). You need to modify it to configure whatever you do, but the important line is 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();
                    }))
    };
}

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