Asp.net Vnext Routing

概述

它将传入的 HTTP 请求映射到路由处理程序给出的路由的集合。

路由系统的责任是找到匹配的路由，创建路由数据，并将请求分配给一个处理程序。

选择动作是 MVC 的处理程序的实现细节。它使用路由数据和从传入请求其他信息来选择要执行的操作

代码实现TemplateRoute 类初始化路由和 URL 模板

  public class MyTemplateRoute : TemplateRoute
        {
        public MyTemplateRoute(IRouteBuilder routeCollectionBuilder)
            : base(routeCollectionBuilder.DefaultHandler,
                   "{controller}/{action}/{id?}",
                  new RouteValueDictionary(new { controller = "Home", action = "Index" }),
                  new RouteValueDictionary(new { }),
                  new RouteValueDictionary(new { }),
                  routeCollectionBuilder.ServiceProvider.GetService<IInlineConstraintResolver>())
            {
            }

        public override Task RouteAsync(RouteContext context)
            {
            return base.RouteAsync(context);
            }
        }

启动类

  public class Startup
    {
        // For more information on how to configure your application, visit http://go.microsoft.com/fwlink/?LinkID=398940
        public void ConfigureServices(IServiceCollection services)
            {
            services.AddMvc();
            }

        public void Configure(IApplicationBuilder app)
        {
            app.UseMvc(routes =>

            {
                //加入模板 默认http://http://localhost/Home/Index
                routes.Routes.Add(new MyTemplateRoute(routes));

            });
            }
    }

实现IRouter添加默认路由

 public class DefaultRoute : IRouter
        {

        private readonly IRouter _next;

        public DefaultRoute(IRouter next)
            {
            _next = next;
            }

        public VirtualPathData GetVirtualPath(VirtualPathContext context)
            {
            return _next.GetVirtualPath(context);
            }

        public async Task RouteAsync(RouteContext context)
            {

            var oldRouteData = context.RouteData;
            var newRouteData = new RouteData(oldRouteData);
            newRouteData.Routers.Add(_next);
            newRouteData.Values["controller"] = "Home";
            newRouteData.Values["action"] = "Index";
            try
                {
                context.RouteData = newRouteData;
                await _next.RouteAsync(context);
                }
            finally
                {
                if (!context.IsHandled)
                    {
                    context.RouteData = oldRouteData;
                    }

                }
            }

        }

  public void Configure(IApplicationBuilder app)
            {
            app.UseMvc(routes =>

            {
                //加入模板 默认http://http://localhost/Home/Index
                //  routes.Routes.Add(new MyTemplateRoute(routes));

                routes.MapRoute("default", "{controller}/{action}");
                //加入路由处理 默认http://http://localhost/Home/Index
                routes.Routes.Add(new DefaultRoute(routes.DefaultHandler));

            });
            }

实现IRouteConstraint约束

  public class DateConstraint : IRouteConstraint
        {
        public bool Match(HttpContext httpContext, IRouter route, string routeKey, IDictionary<string, object> values, RouteDirection routeDirection)
            {
            return values["controller"] == "Home";
            }
        }

  public void Configure(IApplicationBuilder app)
            {
            app.UseMvc(routes =>

            {
                //加入模板 默认http://http://localhost/Home/Index
                //  routes.Routes.Add(new MyTemplateRoute(routes));

                //routes.MapRoute("default", "{controller}/{action}");
                ////加入路由处理 默认http://http://localhost/Home/Index
                //routes.Routes.Add(new DefaultRoute(routes.DefaultHandler));

                //加入约束
                routes.MapRoute(name: "TestRoute", template: "{*constraints}", defaults: new { controller = "Home", action = "Index" }, constraints: new { constraint = new DateConstraint() });

            });
            }

路由特性

public class HomeController : Controller
        {

        //PUT   http://localhost/AB
        [AcceptVerbs("PUT", Route = "AB")]
        // Patch  http://localhost/AB
        [HttpPatch("AB")]
        //PUT   http://localhost/Home/AB
        [AcceptVerbs("PUT", Route = "Home/AB")]
        //Patch   http://localhost/Home/AB
        [HttpPatch("Home/Ab")]

        // ABC 动作 可以被以下地址访问
        //PUT   http://localhost/AB
        // Patch  http://localhost/AB
        //PUT   http://localhost/Home/AB
        //Patch   http://localhost/Home/AB
        public IActionResult  ABC()
            {

            return Content("1");
            }
        }

    }

RouteConstraintAttribute 路由约束

   public class CountrySpecificAttribute : RouteConstraintAttribute
        {
        public CountrySpecificAttribute(string countryCode)
            : base("country", countryCode, blockNonAttributedActions: true)
            {
            }
        }

应用在控制上

添加路由条目

  routes.MapRoute(
                  "products",
                  "Products/{country}/{action}",
                  defaults: new { controller = "Products" })yu

运行截图

IActionConstraintFactory 动作约束