史上最全的ASP.NET MVC路由配置-C#.Net教程-PHP中文網

先說一下基本的路由規則原則。基本的路由規則是從特殊到一般排列，也就是最特殊（非主流）的規則在最前面，最一般（萬金油）的規則排在最後。這是因為匹配路由規則也是照著這個順序的。如果寫反了，那麼即便你路由規則寫對了那照樣坐等404.

XD 先說URL的構造。其實這個也談不上構造，只是語法特性吧。

# URL建構

命名參數規格+匿名物件

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

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建構路由然後新增

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

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直接方法重載+匿名物件

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

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# 　　個人覺得第一種比較易懂，第二種方便調試，第三種寫起來比較效率吧。各取所需吧。本文行文偏向第三種。

路由規則

1.預設路由(MVC自帶)

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) );

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2.靜態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" });

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## 沒有佔位符路由就是現成的寫死的。

例如這樣寫然後去訪問http://localhost:XXX/Shop/OldAction.js，response也是完全沒問題的。 controller , action , area這三個保留字就別設靜態變數裡面了。

3.自訂常規變數URL段（好吧這翻譯暴露智商了）

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

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這種情況如果存取 /Home/Index 的話，因為第三段（id）沒有值，根據路由規則這個參數會被設為DefaultId

這個用viewbag給title賦值就能很明顯看出

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

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圖片不貼了，結果是標題顯示為DefaultId。注意要在控制器裡面賦值，在視圖賦值沒法編譯的。

4.再述預設路由

然後再回到預設路由。 UrlParameter.Optional這個叫可選URL段.路由裡沒有這個參數的話id為null。照原文大致說法，這個可選URL段能用來實現一個關注點的分離。剛才在路由裡直接設定參數預設值其實不是很好。照我的理解，實際參數是用戶發來的，我們做的只是定義形式參數名。但是，如果硬要給參數賦預設值的話，建議用語法糖寫到action參數裡面。如：

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

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5.可變長度路由。

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

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這裡id和最後一段都是可變的，所以/Home/Index/dabdafdaf 等效於/Home/Index//abcdefdjldfiaeahfoeiho 等效於/Home/Index/All/Delete/Perm/.....

6.跨命名空間路由

這個提醒一下記得引用命名空間，開啟IIS網站不然就是404。這個非常非主流，不建議瞎搞。

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

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但是這樣寫的話數組排名不分先後的，如果有多個符合的路由會報錯。然後作者提出了一種改進寫法。

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" });

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這樣第一個URL段不是Home的都交給第二個處理最後還可以設定這個路由找不到的話就不給後面的路由留後路啦，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;

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7.正規表示式匹配路由

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

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約束多個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"});

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## 8.指定請求方法

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" });

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9. WebForm支援

routes.MapPageRoute("", "", "~/Default.aspx");
 
 routes.MapPageRoute("list", "Items/{action}", "~/Items/list.aspx", false, new RouteValueDictionary { { "action", "all" } });
 
 routes.MapPageRoute("show", "Show/{action}", "~/show.aspx", false, new RouteValueDictionary { { "action", "all" } });
 
 routes.MapPageRoute("edit", "Edit/{id}", "~/edit.aspx", false, new RouteValueDictionary { { "id", "1" } }, new RouteValueDictionary { { "id", @"\d+" } });

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具體的可以看

使用Asp.Net4新特性路由建立WebForm應用

或官方msdn

# 10.MVC5的RouteAttribute

首先要在路由註冊方法那裡

//启用路由特性映射
routes.MapMvcAttributeRoutes();

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# 這樣

[Route("Login")]

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route特性才有效.該特性有好幾個重載.還有路由約束啊,順序啊,路由名之類的.###

其他的还有路由前缀,路由默认值

[RoutePrefix("reviews")]<br>[Route("{action=index}")]<br>public class ReviewsController : Controller<br>{<br>}

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路由构造

// eg: /users/5
[Route("users/{id:int}"]
public ActionResult GetUserById(int id) { ... }
 
// eg: users/ken
[Route("users/{name}"]
public ActionResult GetUserByName(string name) { ... }

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参数限制

// eg: /users/5
// but not /users/10000000000 because it is larger than int.MaxValue,
// and not /users/0 because of the min(1) constraint.
[Route("users/{id:int:min(1)}")]
public ActionResult GetUserById(int id) { ... }

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Constraint	Description	Example
alpha	Matches uppercase or lowercase Latin alphabet characters (a-z, A-Z)	{x:alpha}
bool	Matches a Boolean value.	{x:bool}
datetime	Matches a DateTime value.	{x:datetime}
decimal	Matches a decimal value.	{x:decimal}
double	Matches a 64-bit floating-point value.	{x:double}
float	Matches a 32-bit floating-point value.	{x:float}
guid	Matches a GUID value.	{x:guid}
int	Matches a 32-bit integer value.	{x:int}
length	Matches a string with the specified length or within a specified range of lengths.	{x:length(6)} {x:length(1,20)}
long	Matches a 64-bit integer value.	{x:long}
max	Matches an integer with a maximum value.	{x:max(10)}
maxlength	Matches a string with a maximum length.	{x:maxlength(10)}
min	Matches an integer with a minimum value.	{x:min(10)}
minlength	Matches a string with a minimum length.	{x:minlength(10)}
range	Matches an integer within a range of values.	{x:range(10,50)}
regex	Matches a regular expression.	{x:regex(^\d{3}-\d{3}-\d{4}$)}

具体的可以参考

Attribute Routing in ASP.NET MVC 5

对我来说,这样的好处是分散了路由规则的定义.有人喜欢集中,我个人比较喜欢这种灵活的处理.因为这个action定义好后,我不需要跑到配置那里定义对应的路由规则

11.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);
    }
}

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routes.MapRoute("ChromeRoute", "{*catchall}",
 
new { controller = "Home", action = "Index" },
 
new { customConstraint = new UserAgentConstraint("Chrome") },
 
new[] { "UrlsAndRoutes.AdditionalControllers" });

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比如这个就用来匹配是否是用谷歌浏览器访问网页的。

12.访问本地文档

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

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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" />

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把这个节点里的preCondition删除，变成

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

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13.直接访问本地资源，绕过了路由系统

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

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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

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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" });
    }
  
}

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　　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，然后标题起个深入解析XXXX，然后净瞎扯淡。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，然后还在那边书里面专门写了大量的测试。

　　哎没办法啊，技术差距就是这样了。

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