Get() 不工作的简单 ping 控制器的属性路由

Question

我有简单的 asp.net 核心网络 api 和一个微调控制器，returns 对 Get 请求为真。 PingController.cs 如下所示：

[Route("api/[Controller]")]
public class PingController : Controller
{
    [HttpGet]
    public IActionResult Get()
    {
        return Ok(true);
    }
}

为什么导航到控制器 (http://localhost:56103/api/Ping) 返回 404？

我在控制器顶部添加了路由，并为特定操作添加了 HttpMethod。我在这里遗漏或不理解的是什么？

当我在 Startup.cs 中添加 app.UseMvcWithDefaultRoute() 时，控制器工作正常。 （这也让我很困惑。） Startup.cs 如下所示：

public class Startup
{

            public IConfiguration Configuration { get; set; }

            public Startup()
            {
               Configuration = BuildConfiguration();
            }

            // This method gets called by the runtime. Use this method to add services to the container.
            public IServiceProvider ConfigureServices(IServiceCollection services)
            {
                ...
            }

            // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
            public void Configure(IApplicationBuilder app, IHostingEnvironment env)
            {
                if (env.IsDevelopment())
                {
                    app.UseDeveloperExceptionPage();
                }
                else
                {
                    // The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
                    app.UseHsts();
                }
                ConfigureRoutes(app);
            }

            private static void ConfigureMvc(IServiceCollection services, Config config)
            {
                services.AddMvc()
                    .SetCompatibilityVersion(CompatibilityVersion.Version_2_2)// auto generated
                    .AddJsonOptions(options => { options.SerializerSettings.Formatting = Formatting.Indented; })
                    .AddControllersAsServices();

            }

            private static void ConfigureRoutes(IApplicationBuilder app)
            {
                //app.UseMvcWithDefaultRoute();
            }
        }

Answer 1

您需要在启动时添加UseMvc()或UseMvcWithDefaultRoute()来定义路由。

UseMvcWithDefaultRoute 将名为 'default' 的默认路由添加到请求执行管道并等于

app.UseMvc(routes =>
{
    routes.MapRoute(
        name: "default",
        template: "{controller=Home}/{action=Index}/{id?}");
});