继续延续坑爹标题系列。其实只是把apress.pro.asp.net.mvc.4.framework里的CHAPTER 13翻译过来罢了，当做自己总结吧。内容看看就好，排版就不要吐槽了，反正我知道你也不会反对的。
XD 首先说URL的构造。 其实这个也谈不上构造，只是语法特性吧。
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 } );
构造路由之后呢添加
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。该篇行文偏向于第三种。
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” }); <br><br>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。
比如这样写之后呢去访问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
之后呢再回到默认路由。 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。 之后呢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” }); <br><br>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，之后呢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。
路由测试（在测试项目的基础上，要装moq）
PM> Install-Package Moq
using System;
using Microsoft.VisualStudio.TestTools.UnitTesting;
using System.Web;
using Moq;
using System.Web.Routing;
using System.Reflection;
[TestClass]
public class RoutesTest
{
private HttpContextBase CreateHttpContext(string targetUrl = null, string HttpMethod = “GET”)
{
// create the mock request
Mock<HttpRequestBase> mockRequest = new Mock<HttpRequestBase>();
mockRequest.Setup(m => m.AppRelativeCurrentExecutionFilePath)
.Returns(targetUrl);
mockRequest.Setup(m => m.HttpMethod).Returns(HttpMethod);
// create the mock response
Mock<HttpResponseBase> mockResponse = new Mock<HttpResponseBase>();
mockResponse.Setup(m => m.ApplyAppPathModifier(
It.IsAny<string>())).Returns<string>(s => s);
// create the mock context, using the request and response
Mock<HttpContextBase> mockContext = new Mock<HttpContextBase>();
mockContext.Setup(m => m.Request).Returns(mockRequest.Object);
mockContext.Setup(m => m.Response).Returns(mockResponse.Object);
// return the mocked context
return mockContext.Object;
}private void TestRouteMatch(string url, string controller, string action, object routeProperties = null, string httpMethod = “GET”)
{
// Arrange
RouteCollection routes = new RouteCollection();
RouteConfig.RegisterRoutes(routes);
// Act – process the route
RouteData result = routes.GetRouteData(CreateHttpContext(url, httpMethod));
// Assert
Assert.IsNotNull(result);
Assert.IsTrue(TestIncomingRouteResult(result, controller, action, routeProperties));
}private bool TestIncomingRouteResult(RouteData routeResult, string controller, string action, object propertySet = null)
{
Func<object, object, bool> valCompare = (v1, v2) =>
{
return StringComparer.InvariantCultureIgnoreCase
.Compare(v1, v2) == 0;
};
bool result = valCompare(routeResult.Values["controller"], controller)
&& valCompare(routeResult.Values["action"], action);
if (propertySet != null)
{
PropertyInfo[] propInfo = propertySet.GetType().GetProperties();
foreach (PropertyInfo pi in propInfo)
{
if (!(routeResult.Values.ContainsKey(pi.Name)
&& valCompare(routeResult.Values[pi.Name],
pi.GetValue(propertySet, null))))
{
result = false;
break;
}
}
}
return result;
}private void TestRouteFail(string url)
{
// Arrange
RouteCollection routes = new RouteCollection();
RouteConfig.RegisterRoutes(routes);
// Act – process the route
RouteData result = routes.GetRouteData(CreateHttpContext(url));
// Assert
Assert.IsTrue(result == null || result.Route == null);
}[TestMethod]
public void TestIncomingRoutes()
{
// check for the URL that we hope to receive
TestRouteMatch(“~/Admin/Index”, “Admin”, “Index”);
// check that the values are being obtained from the segments
TestRouteMatch(“~/One/Two”, “One”, “Two”);
// ensure that too many or too few segments fails to match
TestRouteFail(“~/Admin/Index/Segment”);//失败
TestRouteFail(“~/Admin”);//失败
TestRouteMatch(“~/”, “Home”, “Index”);
TestRouteMatch(“~/Customer”, “Customer”, “Index”);
TestRouteMatch(“~/Customer/List”, “Customer”, “List”);
TestRouteFail(“~/Customer/List/All”);//失败
TestRouteMatch(“~/Customer/List/All”, “Customer”, “List”, new { id = “All” });
TestRouteMatch(“~/Customer/List/All/Delete”, “Customer”, “List”, new { id = “All”, catchall = “Delete” });
TestRouteMatch(“~/Customer/List/All/Delete/Perm”, “Customer”, “List”, new { id = “All”, catchall = “Delete/Perm” });
}}
最后还是再推荐一下Adam Freeman写的apress.pro.asp.net.mvc.4这本书。稍微熟悉MVC的从第二部分开始读好了。前面都是入门（对我来说是扯淡）。但总比国内某些写书的人好吧——把个开源项目的源代码下载下来帖到书上面来，之后呢标题起个深入解析XXXX，之后呢净瞎扯淡。最后一千多页的巨著又诞生了。Adam Freeman的风格我就很喜欢，都是实例写作，之后呢还在那边书里面专门写了大量的测试。