三、具体实现
　　1、路由定义
public class RoutePriority : Route
{
public string Name { get; set; }
public int Priority { get; set; }
public RoutePriority(string url， IRouteHandler routeHandler)
: base(url，routeHandler)
{
}
}
public class HttpRoutePriority
{
public string Name { get; set; }
public int Priority { get; set; }
public string RouteTemplate{get;set;}
public object Defaults{get;set;}
public object Constraints{get;set;}
public HttpMessageHandler Handler{get;set;}
}
　　2、定义路由注册的接口
　　public interface IRouteRegister
　　{
　　void Register(RegistrationContext context);
　　}
　　3、定义路由注册上下文类
public class RegistrationContext
{
#region mvc
public List<RoutePriority> Routes = new List<RoutePriority>();
public RoutePriority MapRoute(string name， string url，int priority=0)
{
return MapRoute(name， url， (object)null /* defaults */， priority);
}
public RoutePriority MapRoute(string name， string url， object defaults， int priority = 0)
{
return MapRoute(name， url， defaults， (object)null /* constraints */， priority);
}
public RoutePriority MapRoute(string name， string url， object defaults， object constraints， int priority = 0)
{
return MapRoute(name， url， defaults， constraints， null /* namespaces */， priority);
}
public RoutePriority MapRoute(string name， string url， string[] namespaces， int priority = 0)
{
return MapRoute(name， url， (object)null /* defaults */， namespaces， priority);
}
public RoutePriority MapRoute(string name， string url， object defaults， string[] namespaces，int priority=0)
{
return MapRoute(name， url， defaults， null /* constraints */， namespaces， priority);
}
public RoutePriority MapRoute(string name， string url， object defaults， object constraints， string[] namespaces， int priority = 0)
{
var route = MapPriorityRoute(name， url， defaults， constraints， namespaces， priority);
var areaName = GetAreaName(defaults);
route.DataTokens["area"] = areaName;
// disabling the namespace lookup fallback mechanism keeps this areas from accidentally picking up
// controllers belonging to other areas
bool useNamespaceFallback = (namespaces == null || namespaces.Length == 0);
route.DataTokens["UseNamespaceFallback"] = useNamespaceFallback;
return route;
}
private static string GetAreaName(object defaults)
{
if (defaults != null)
{
var property = defaults.GetType().GetProperty("area");
if (property != null)
return (string)property.GetValue(defaults， null);
}
return null;
}
private RoutePriority MapPriorityRoute(string name， string url， object defaults， object constraints， string[] namespaces，int priority)
{
if (url == null)
{
throw new ArgumentNullException("url");
}
var route = new RoutePriority(url， new MvcRouteHandler())
{
Name = name，
Priority = priority，
Defaults = CreateRouteValueDictionary(defaults)，
Constraints = CreateRouteValueDictionary(constraints)，
DataTokens = new RouteValueDictionary()
};
if ((namespaces != null) && (namespaces.Length > 0))
{
route.DataTokens["Namespaces"] = namespaces;
}
Routes.Add(route);
return route;
}
private static RouteValueDictionary CreateRouteValueDictionary(object values)
{
var dictionary = values as IDictionary<string， object>;
if (dictionary != null)
{
return new RouteValueDictionary(dictionary);
}
return new RouteValueDictionary(values);
}
#endregion
#region http
public List<HttpRoutePriority> HttpRoutes = new List<HttpRoutePriority>();
public HttpRoutePriority MapHttpRoute(string name， string routeTemplate， int priority = 0)
{
return MapHttpRoute(name， routeTemplate， defaults: null， constraints: null， handler: null， priority: priority);
}
public HttpRoutePriority MapHttpRoute(string name， string routeTemplate， object defaults， int priority = 0)
{
return MapHttpRoute(name， routeTemplate， defaults， constraints: null， handler: null， priority: priority);
}
public HttpRoutePriority MapHttpRoute(string name， string routeTemplate， object defaults， object constraints， int priority = 0)
{
return MapHttpRoute(name， routeTemplate， defaults， constraints， handler: null， priority: priority);
}
public HttpRoutePriority MapHttpRoute(string name， string routeTemplate， object defaults， object constraints， HttpMessageHandler handler， int priority = 0)
{
var httpRoute = new HttpRoutePriority();
httpRoute.Name = name;
httpRoute.RouteTemplate = routeTemplate;
httpRoute.Defaults = defaults;
httpRoute.Constraints = constraints;
httpRoute.Handler = handler;
httpRoute.Priority = priority;
HttpRoutes.Add(httpRoute);
return httpRoute;
}
#endregion
}
　　4、把路由注册处理方法添加到Configuration类中
public static Configuration RegisterRoutePriority(this Configuration config)
{
var typesSoFar = new List<Type>();
var assemblies = GetReferencedAssemblies();
foreach (Assembly assembly in assemblies)
{
var types = assembly.GetTypes().Where(t => typeof(IRouteRegister).IsAssignableFrom(t) && !t.IsAbstract && !t.IsInterface);
typesSoFar.AddRange(types);
}
var context = new RegistrationContext();
foreach (var type in typesSoFar)
{
var obj = (IRouteRegister)Activator.CreateInstance(type);
obj.Register(context);
}
foreach (var route in context.HttpRoutes.OrderByDescending(x => x.Priority))
GlobalConfiguration.Configuration.Routes.MapHttpRoute(route.Name， route.RouteTemplate， route.Defaults， route.Constraints， route.Handler);
foreach (var route in context.Routes.OrderByDescending(x => x.Priority))
RouteTable.Routes.Add(route.Name， route);
return config;
}
private static IEnumerable<Assembly> GetReferencedAssemblies()
{
var assemblies = BuildManager.GetReferencedAssemblies();
foreach (Assembly assembly in assemblies)
yield return assembly;
}
这样一来大功告成，使用时只需要在Global.asax.cs文件中修改原注册入口为
public class MvcApplication : System.Web.HttpApplication
{
protected void Application_Start()
{
WebApiConfig.Register(GlobalConfiguration.Configuration);
FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
RouteConfig.RegisterRoutes(RouteTable.Routes);
Configuration.Instance()
.RegisterComponents()
.RegisterRoutePriority(); //注册自定义路由
}
}
　　在每个项目中使用只需要要继承自定义路由注册接口IRouteRegister，例如：
public class Registration : IRouteRegister
{
public void Register(RegistrationContext context)
{
//注册后端管理登录路由
context.MapRoute(
name: "Admin_Login"，
url: "Admin/login"，
defaults: new { area = "Admin"， controller = "Account"， action = "Login"， id = UrlParameter.Optional }，
namespaces: new string[] { "Wenku.Admin.Controllers" }，
priority: 11
);
//注册后端管理页面默认路由
context.MapRoute(
name: "Admin_default"，
url: "Admin/{controller}/{action}/{id}"，
defaults: new { area = "Admin"， controller = "Home"， action = "Index"， id = UrlParameter.Optional }，
namespaces: new string[] { "Wenku.Admin.Controllers" }，
priority: 10
);
//注册手机访问WebApi路由
context.MapHttpRoute(
name: "Mobile_Api"，
routeTemplate: "api/mobile/{controller}/{action}/{id}"，
defaults: new
{
area = "mobile"，
action = RouteParameter.Optional，
id = RouteParameter.Optional，
namespaceName = new string[] { "Wenku.Mobile.Http" }
}，
constraints: new { action = new StartWithConstraint() }，
priority: 0
);
}
}
　　四、总结
　　这是一个对Asp.Net Mvc的一个很小的功能拓展，小项目可能不太需要这个功能，但有时候项目大了注册的路由不生效时你应该要想到有可能是因为路由顺序的原因，这时这个路由优先级的功能有可能会给你带来便利。总之共享给有需要的朋友们参考。