.net core web 中使用app.UseRouter的几种使用方式

  public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
        {
            loggerFactory.AddConsole();
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }

            app.UseHangfireServer();
            app.UseHangfireDashboard();

            //方式一
            //app.Run(async (context) =>
            //{
            //    await context.Response.WriteAsync("Hello World!");
            //});

            //方式二
            //var endpoint = new RouteHandler((c) => c.Response.WriteAsync("Hello, I am Routing!"));
            //app.UseRouter(endpoint);

            //方式三
            var endpoint = new RouteHandler((c) =>c.Response.WriteAsync($"Hello, I am Routing! your item is {c.GetRouteValue("item")}"));
            var resolver = app.ApplicationServices.GetRequiredService<IInlineConstraintResolver>();
            var runRoute = new Route(endpoint, "{item=home}", resolver);
            app.UseRouter(runRoute);

            //方式四
            var runRoute1 = new Route(endpoint, "{item=home}", resolver);
            var otherRoute = new Route(endpoint, "other/{item=other_home}", resolver);
            var routeCollection = new RouteCollection();
            routeCollection.Add(runRoute1);
            routeCollection.Add(otherRoute);
            app.UseRouter(routeCollection);

            //方式五
            var routeBuilder = new RouteBuilder(app)
            {
                DefaultHandler = endpoint,
            };
            routeBuilder.MapRoute("default", "{item=home}");
            routeBuilder.MapRoute("other", "other/{item=other_home}");

            app.UseRouter(routeBuilder.Build());

            //方式六，改写handler
            var myendpoint = new MyRouteHandler();
            var myrouteBuilder = new RouteBuilder(app)
            {
                DefaultHandler = myendpoint,
            };
            myrouteBuilder.MapRoute("default", "{controller=Home}/{action=Index}/{id?}");
            app.UseRouter(myrouteBuilder.Build());

        }

自定义hanlder

 public class MyRouteHandler : IRouter
    {
        public VirtualPathData GetVirtualPath(VirtualPathContext context)
        {
            return null;
        }

        public Task RouteAsync(RouteContext context)
        {

            context.Handler = (c) =>
            {
                var printStr = $"controller:{c.GetRouteValue("controller")}," +
                $"action:{c.GetRouteValue("action")},id:{c.GetRouteValue("id")}";
                return c.Response.WriteAsync(printStr);
            };
            return Microsoft.AspNetCore.Routing.Internal.TaskCache.CompletedTask;
        }
    }