为ASP.NET MVC及WebApi添加路由优先级

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 
} 
								 
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