更改端口

dotnet WebApplication1.dll --server.urls "http://*:8080"

public static IWebHostBuilder CreateWebHostBuilder(string[] args)
        {
            var configuration = new ConfigurationBuilder().SetBasePath(Environment.CurrentDirectory)
                                          .AddJsonFile("host.json")
                                          .Build();

            var url = configuration["url"];

            return WebHost.CreateDefaultBuilder(args).UseUrls(configuration["url"])
                                                     .UseStartup<Startup>();
        }