Startup檔案

IServiceProvider通過GetService(Type serviceType)拿到例項

public class Startup
    {
        // This method gets called by the runtime. Use this method to add services to the container.
        // For more information on how to configure your application, visit https://go.microsoft.com/fwlink/?LinkID=398940
 

        public void ConfigureServices(IServiceCollection services)
        {
            services.AddSingleton<TestServer>();
        }

        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app, IHostingEnvironment env, IServiceProvider serviceProvider)
        {
            
 
if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }

            

            app.Run(async (context) =>
            {
                await context.Response.WriteAsync("Hello World!");
            });
            TestServer testServer = serviceProvider.GetService<TestServer>();
            testServer.Start();
        }
    }
 

public class TestServer
{
    private readonly IHostingEnvironment _iHostingEnvironment;

    public TestServer(IHostingEnvironment iHostingEnvironment)
    {
        _iHostingEnvironment = iHostingEnvironment;
    }

    public void Start()
    {

        Console.WriteLine(_iHostingEnvironment.WebRootPath);
    }
}