ASP.NET MVC路由配置详解

命名参数规范+匿名对象

routes.MapRoute( name: "Default", url: "{controller}/{action}/{id}", defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional } );

构造路由然后添加

Route myRoute = new Route("{controller}/{action}", new MvcRouteHandler()); routes.Add("MyRoute", myRoute);

直接方法重载+匿名对象

routes.MapRoute("ShopSchema", "Shop/{action}", new { controller = "Home" });

个人觉得第一种比较易懂，第二种方便调试，第三种写起来比较效率吧。各取所需吧。本文行文偏向于第三种。

1.默认路由(MVC自带)

routes.MapRoute( "Default", // 路由名称 "{controller}/{action}/{id}", // 带有参数的 URL new { controller = "Home", action = "Index", id = UrlParameter.Optional } // 参数默认值 (UrlParameter.Optional-可选的意思) );

2.静态URL段

routes.MapRoute("ShopSchema2", "Shop/OldAction", new { controller = "Home", action = "Index" }); 

routes.MapRoute("ShopSchema", "Shop/{action}", new { controller = "Home" }); 

routes.MapRoute("ShopSchema2", "Shop/OldAction.js", new { controller = "Home", action = "Index" });

没有占位符路由就是现成的写死的。

比如这样写然后去访问http://localhost:XXX/Shop/OldAction.js，response也是完全没问题的。 controller , action , area这三个保留字就别设静态变量里面了。

3.自定义常规变量URL段（好吧这翻译暴露智商了）

routes.MapRoute("MyRoute2", "{controller}/{action}/{id}", new { controller = "Home", action = "Index", id = "DefaultId" });

这种情况如果访问 /Home/Index 的话，因为第三段（id）没有值，根据路由规则这个参数会被设为DefaultId

这个用viewbag给title赋值就能很明显看出

ViewBag.Title = RouteData.Values["id"];

图不贴了，结果是标题显示为DefaultId。注意要在控制器里面赋值，在视图赋值没法编译的。

4.再述默认路由

然后再回到默认路由。 UrlParameter.Optional这个叫可选URL段.路由里没有这个参数的话id为null。照原文大致说法，这个可选URL段能用来实现一个关注点的分离。刚才在路由里直接设定参数默认值其实不是很好。照我的理解，实际参数是用户发来的，我们做的只是定义形式参数名。但是，如果硬要给参数赋默认值的话，建议用语法糖写到action参数里面。比如：

public ActionResult Index(string id = "abcd") { ViewBag.Title = RouteData.Values["id"]; return View(); }

5.可变长度路由。

routes.MapRoute("MyRoute", "{controller}/{action}/{id}/{*catchall}", new { controller = "Home", action = "Index", id = UrlParameter.Optional });

在这里id和最后一段都是可变的，所以 /Home/Index/dabdafdaf 等效于 /Home/Index//abcdefdjldfiaeahfoeiho 等效于 /Home/Index/All/Delete/Perm/.....

6.跨命名空间路由

这个提醒一下记得引用命名空间，开启IIS网站不然就是404。这个非常非主流，不建议瞎搞。

routes.MapRoute("MyRoute", "{controller}/{action}/{id}/{*catchall}", new { controller = "Home", action = "Index", id = UrlParameter.Optional }, new[] { "URLsAndRoutes.AdditionalControllers", "UrlsAndRoutes.Controllers" });

但是这样写的话数组排名不分先后的，如果有多个匹配的路由会报错。然后作者提出了一种改进写法。

routes.MapRoute("AddContollerRoute", "Home/{action}/{id}/{*catchall}", new { controller = "Home", action = "Index", id = UrlParameter.Optional }, new[] { "URLsAndRoutes.AdditionalControllers" }); 

routes.MapRoute("MyRoute", "{controller}/{action}/{id}/{*catchall}", new { controller = "Home", action = "Index", id = UrlParameter.Optional }, new[] { "URLsAndRoutes.Controllers" });

这样第一个URL段不是Home的都交给第二个处理最后还可以设定这个路由找不到的话就不给后面的路由留后路啦，也就不再往下找啦。

Route myRoute = routes.MapRoute("AddContollerRoute", "Home/{action}/{id}/{*catchall}", new { controller = "Home", action = "Index", id = UrlParameter.Optional }, new[] { "URLsAndRoutes.AdditionalControllers" }); 

myRoute.DataTokens["UseNamespaceFallback"] = false;

7.正则表达式匹配路由

routes.MapRoute("MyRoute", "{controller}/{action}/{id}/{*catchall}",

 new { controller = "Home", action = "Index", id = UrlParameter.Optional },

 new { controller = "^H.*"},

new[] { "URLsAndRoutes.Controllers"});

约束多个URL

routes.MapRoute("MyRoute", "{controller}/{action}/{id}/{*catchall}",

new { controller = "Home", action = "Index", id = UrlParameter.Optional },

new { controller = "^H.*", action = "^Index$|^About$"},

new[] { "URLsAndRoutes.Controllers"});

8.指定请求方法

routes.MapRoute("MyRoute", "{controller}/{action}/{id}/{*catchall}",

new { controller = "Home", action = "Index", id = UrlParameter.Optional }, 

new { controller = "^H.*", action = "Index|About", httpMethod = new HttpMethodConstraint("GET") }, 

new[] { "URLsAndRoutes.Controllers" });

9.最后还是不爽的话自己写个类实现 IRouteConstraint的匹配方法。

using System;

  using System.Collections.Generic;

  using System.Linq;

  using System.Web;

  using System.Web.Routing;

  /// <summary>

  /// If the standard constraints are not sufficient for your needs, you can define your own custom constraints by implementing the IRouteConstraint interface.

  /// </summary>

  public class UserAgentConstraint : IRouteConstraint

  {

    private string requiredUserAgent;

    public UserAgentConstraint(string agentParam)

    {

      requiredUserAgent = agentParam;

    }

    public bool Match(HttpContextBase httpContext, Route route, string parameterName,

    RouteValueDictionary values, RouteDirection routeDirection)

    {

      return httpContext.Request.UserAgent != null &&

      httpContext.Request.UserAgent.Contains(requiredUserAgent);

    }

  }

routes.MapRoute("ChromeRoute", "{*catchall}", 

new { controller = "Home", action = "Index" }, 

new { customConstraint = new UserAgentConstraint("Chrome") }, 

new[] { "UrlsAndRoutes.AdditionalControllers" });

比如这个就用来匹配是否是用谷歌浏览器访问网页的。

10.访问本地文档

routes.RouteExistingFiles = true; 

routes.MapRoute("DiskFile", "Content/StaticContent.html", new { controller = "Customer", action = "List", });

浏览网站，以开启 IIS Express，然后点显示所有应用程序-点击网站名称-配置（applicationhost.config）-搜索UrlRoutingModule节点

<add name="UrlRoutingModule-4.0" type="System.Web.Routing.UrlRoutingModule" preCondition="managedHandler,runtimeVersionv4.0" />

把这个节点里的preCondition删除，变成

<add name="UrlRoutingModule-4.0" type="System.Web.Routing.UrlRoutingModule" preCondition="" />

11.直接访问本地资源，绕过了路由系统

routes.IgnoreRoute("Content/{filename}.html");

文件名还可以用 {filename}占位符。

IgnoreRoute方法是RouteCollection里面StopRoutingHandler类的一个实例。路由系统通过硬-编码识别这个Handler。如果这个规则匹配的话，后面的规则都无效了。这也就是默认的路由里面routes.IgnoreRoute("{resource}.axd/{*pathInfo}");写最前面的原因。

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ASP.NET MVC路由配置详解

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