c# - 如何在 ASP.NET Core 3 预览版中使用 Lamar 2？

Question

我使用 ASP.NET Core 3 配置了 Lamar，但出现错误

System.InvalidCastException: 'Unable to cast object of type 'Microsoft.Extensions.DependencyInjection.ServiceCollection' to type 'Lamar.ServiceRegistry'.'

我在Program课堂上的配置：

    public class Program
    {
        public static void Main(string[] args)
        {
            CreateHostBuilder(args).Build().Run();
        }

        public static IHostBuilder CreateHostBuilder(string[] args) =>
            Host.CreateDefaultBuilder(args)
                .ConfigureWebHostDefaults(webBuilder =>
                {
                    webBuilder.UseLamar();
                    webBuilder.UseStartup<Startup>();
                });
    }

和Startup类：

public IConfiguration Configuration { get; }

        // This method gets called by the runtime. Use this method to add services to the container.
        //public void ConfigureServices(IServiceCollection services)
        //{
        //    services.Configure<CookiePolicyOptions>(options =>
        //    {
        //        // This lambda determines whether user consent for non-essential cookies is needed for a given request.
        //        options.CheckConsentNeeded = context => true;
        //        options.MinimumSameSitePolicy = SameSiteMode.None;
        //    });
        //    services.AddMvc()
        //        .AddNewtonsoftJson();
        //}

        public void ConfigureContainer(ServiceRegistry services)
        {
            services.Configure<CookiePolicyOptions>(options =>
            {
                // This lambda determines whether user consent for non-essential cookies is needed for a given request.
                options.CheckConsentNeeded = context => true;
                options.MinimumSameSitePolicy = SameSiteMode.None;
            });

            // Supports ASP.Net Core DI abstractions
            services.AddMvc().AddNewtonsoftJson();            
            services.AddLogging();

            // Also exposes Lamar specific registrations
            // and functionality
            services.Scan(s =>
            {
                s.TheCallingAssembly();
                s.WithDefaultConventions();
            });
        }

根据我替换的文档ConfigureServices，ConfigureContainer但我得到了上面提到的错误。

谁能帮我在 ASP.NET Core 3 预览版中使用 Lamar？

已更新正如#Tom Style 所写，接受的答案已经过时且已贬值，因此他将新答案放在了他的答案中。

Answer 1

您可以尝试将 HostBuilder 替换为旧的，如下所示：

 public static IWebHostBuilder CreateHostBuilder(string[] args) =>
        WebHost.CreateDefaultBuilder(args)
            .UseLamar()
            .UseUrls($"http://*:80")
            .UseStartup<Startup>();

Answer 2

IWebHostBuilder 肯定会工作，但现在已弃用。

此代码示例展示了如何将它与现代 IHostBuilder 界面一起使用。

public static void Main(string[] args)
{
    CreateHostBuilder(args).Build().Run();
}

private static IHostBuilder CreateHostBuilder(string[] args) =>
   Host.CreateDefaultBuilder(args)
      .UseLamar();
      .ConfigureWebHostDefaults(webBuilder =>
      {
          webBuilder.UseStartup<Startup>();
      })

官方文档链接