NopCommerce源码架构详解--路由相关源码分析

刚开始研究nop的同学要找到里面一个Url对应Controller相关代码，可能会有点晕。因为NopCommerce为了对seo友好，对其Url做了一些处理，自定义了路由规则，同时为了支持插件机制，加了一些自己的类进行扩展。本文就来分析一个NopCommerce路由相关源码设计思路，同样我们也先来看看相关的类图：

上面就是NopCommerce路由相关功能主要的类、接口及关系。有以下类：

1、mvcApplication

2、IRoutePublisher、RoutePublisher

3、IRouteProvider、RouteProvider、GenericUrlRouteProvider

其中RoutePublisher是用来发布RouteProvider、GenericUrlRouteProvider里面配置的路由规则的，二者都有一个抽象的接口。接下来我们就来看看这些类或接口中代码是如何实现的：

Nop.Web.MvcApplication

1. public static void RegisterRoutes(RouteCollection routes)
2. {
3. routes.IgnoreRoute("favicon.ico");
4. routes.IgnoreRoute("{resource}.axd/{*pathInfo}");
6. //注册自定义的路由规则及插件相关路由
7. var routePublisher = EngineContext.Current.Resolve<IRoutePublisher>();
8. routePublisher.RegisterRoutes(routes);
10. routes.MapRoute(
11. "Default", // Route name
12. "{controller}/{action}/{id}", // URL with parameters
13. new { controller = "Home", action = "Index", id = UrlParameter.Optional },
14. new[] { "Nop.Web.Controllers" }
15. );
16. }

EngineContext.Current.Resolve<IRoutePublisher>()这名代码表示，从Ioc容器Autofac中获取接口IRoutePublisher所依赖的具体实现类。如果对Nop的依赖注入原理还是很了解，可以参考我之前的文章NopCommerce源码架构详解--Autofac依赖注入分析。

在Nop.Web.Framework.DependencyRegistrar中有以下代码：

1. builder.RegisterType<RoutePublisher>().As<IRoutePublisher>().SingleInstance();

Nop.Web.Framework.Mvc.Routes.RoutePublisher

我们找到这个RoutePublisher类（Nop.Web.Framework.Mvc.Routes.RoutePublisher）其中关键的代码如下：

1. public virtual void RegisterRoutes(RouteCollection routes)
2. {
3. //通过typeFinder找出所有（包括插件）实现了接口IRouteProvider相关的类型
4.  var routeProviderTypes = typeFinder.FindClassesOfType<IRouteProvider>();
5. var routeProviders = new List<IRouteProvider>();
6. foreach (var providerType in routeProviderTypes)
7. {
8. //Ignore not installed plugins
9. var plugin = FindPlugin(providerType);
10. if (plugin != null && !plugin.Installed)
11. continue;
12. //采用反射动态创建IRouteProvider的具体类的实例
13. var provider = Activator.CreateInstance(providerType) as IRouteProvider;
14. routeProviders.Add(provider);
15. }
16. routeProviders = routeProviders.OrderByDescending(rp => rp.Priority).ToList();
17. //依次调用RouteProvider的RegisterRoutes方法，注册路由规则
18. routeProviders.ForEach(rp => rp.RegisterRoutes(routes));
19. }

Nop.Web.Infrastructure.RouteProvider

现在我们来看看一个具体的RouteProvider里面都有些什么东东。在项目Nop.Web根目录下面有一个文件夹Infrastructure，里面有一个RouteProvider类，如下图：

1. public void RegisterRoutes(RouteCollection routes)
2. {
3. //We reordered our routes so the most used ones are on top. It can improve performance.
5. //home page
6. routes.MapLocalizedRoute("HomePage",
7. "",
8. new { controller = "Home", action = "Index" },
9. new[] { "Nop.Web.Controllers" });
11. //widgets
12. //we have this route for performance optimization because named routes are MUCH faster than usual Html.Action(...)
13. //and this route is highly used
14. routes.MapRoute("WidgetsByZone",
15. "widgetsbyzone/",
16. new { controller = "Widget", action = "WidgetsByZone" },
17. new[] { "Nop.Web.Controllers" });
19. //login
20. routes.MapLocalizedRoute("Login",
21. "login/",
22. new { controller = "Customer", action = "Login" },
23. new[] { "Nop.Web.Controllers" });
24. //register
25. routes.MapLocalizedRoute("Register",
26. "register/",
27. new { controller = "Customer", action = "Register" },
28. new[] { "Nop.Web.Controllers" });
29. //logout
30. routes.MapLocalizedRoute("Logout",
31. "logout/",
32. new { controller = "Customer", action = "Logout" },
33. new[] { "Nop.Web.Controllers" });
35. //shopping cart
36. routes.MapLocalizedRoute("ShoppingCart",
37. "cart/",
38. new { controller = "ShoppingCart", action = "Cart" },
39. new[] { "Nop.Web.Controllers" });
40. //wishlist
41. routes.MapLocalizedRoute("Wishlist",
42. "wishlist/{customerGuid}",
43. new { controller = "ShoppingCart", action = "Wishlist", customerGuid = UrlParameter.Optional },
44. new[] { "Nop.Web.Controllers" });
46. //customer
47. routes.MapLocalizedRoute("CustomerInfo",
48. "customer/info",
49. new { controller = "Customer", action = "Info" },
50. new[] { "Nop.Web.Controllers" });
51. //....省略剩余代码
52. }

RouteProvider的方法RegisterRoutes就是真正自定义路由规则。我们如果要找一个Url对应的Controller就要先在这里面查找一下，才好定位到是哪一个Controller。至于插件的路由我接下来会用专门一篇文章来介绍Nop的插件机制。

Nop.Web.Infrastructure.GenericUrlRouteProvider

GenericUrlRouteProvider和Nop.Web.Infrastructure.RouteProvider是相同级别的都是实现了接口IRouteProvider，区别GenericUrlRouteProvider定义的一般公用的Url规则。如下代码：

1. public partial class GenericUrlRouteProvider : IRouteProvider
2. {
3. public void RegisterRoutes(RouteCollection routes)
4. {
5. //generic URLs
6. routes.MapGenericPathRoute("GenericUrl",
7. "{generic_se_name}",
8. new {controller = "Common", action = "GenericUrl"},
9. new[] {"Nop.Web.Controllers"});
11. //define this routes to use in UI views (in case if you want to customize some of them later)
12. routes.MapLocalizedRoute("Product",
13. "{SeName}",
14. new { controller = "Product", action = "ProductDetails" },
15. new[] {"Nop.Web.Controllers"});
17. routes.MapLocalizedRoute("Category",
18. "{SeName}",
19. new { controller = "Catalog", action = "Category" },
20. new[] { "Nop.Web.Controllers" });
22. routes.MapLocalizedRoute("Manufacturer",
23. "{SeName}",
24. new { controller = "Catalog", action = "Manufacturer" },
25. new[] { "Nop.Web.Controllers" });
27. routes.MapLocalizedRoute("Vendor",
28. "{SeName}",
29. new { controller = "Catalog", action = "Vendor" },
30. new[] { "Nop.Web.Controllers" });
32. routes.MapLocalizedRoute("NewsItem",
33. "{SeName}",
34. new { controller = "News", action = "NewsItem" },
35. new[] { "Nop.Web.Controllers" });
37. routes.MapLocalizedRoute("BlogPost",
38. "{SeName}",
39. new { controller = "Blog", action = "BlogPost" },
40. new[] { "Nop.Web.Controllers" });
42. routes.MapLocalizedRoute("Topic",
43. "{SeName}",
44. new { controller = "Topic", action = "TopicDetails" },
45. new[] { "Nop.Web.Controllers" });
46. }
48. public int Priority
49. {
50. get
51. {
52. //it should be the last route
53. //we do not set it to -int.MaxValue so it could be overriden (if required)
54. return -1000000;
55. }
56. }
57. }

可以看到上面可以看到上面定义了商品列表、商品详情及新闻等相关的Url规则。