相关疑难解决方法(0)

我在Visual Studio 2019 Preview 2.2中使用默认模板创建了ASP.NET Core 3.0 Web应用程序，并尝试在启动中注入ILogger：

namespace WebApplication1
{
    public class Startup
    {
        private readonly ILogger _logger;

        public Startup(IConfiguration configuration, ILogger<Startup> logger)
        {
            Configuration = configuration;
            _logger = logger;
        }
        // ...
    }
}

在Program.cs中，我还调用ConfigureLogging（）方法：

namespace WebApplication1
{
    public class Program
    {
        public static void Main(string[] args)
        {
            CreateHostBuilder(args).Build().Run();
        }

        public static IHostBuilder CreateHostBuilder(string[] args) =>
            Host.CreateDefaultBuilder(args)
                .ConfigureLogging((hostingContext, logging) =>
                {
                    logging.AddConfiguration(hostingContext.Configuration.GetSection("Logging"));
                    logging.ClearProviders();
                    logging.AddConsole();
                })
                .ConfigureWebHostDefaults(webBuilder =>
                {
                    webBuilder.UseStartup<Startup>();
                });
    }
}

它在ASP.NET Core 2.x中工作，但在ASP.NET Core 3中失败，并显示以下错误：

System.InvalidOperationException: …