1.RouteBase是一个抽象基类，定义了两个功能：

1.从HttpContextBase中根据Route Map规则得到RouteData

2.得到虚拟路径数据(将在 Route 类(下) 中讲解)

using System.Security.Permissions;
using System.Web;

namespace System.Web.Routing
{
    [AspNetHostingPermission(SecurityAction.InheritanceDemand, Level = AspNetHostingPermissionLevel.Minimal),
     AspNetHostingPermission(SecurityAction.LinkDemand, Level = AspNetHostingPermissionLevel.Minimal)]
    public abstract class RouteBase
    {
        // Methods

        public abstract RouteData GetRouteData(HttpContextBase httpContext);
        public abstract VirtualPathData GetVirtualPath(RequestContext requestContext, RouteValueDictionary values);
    }
}

2. RouteData类，保存Route数据的类，提供如下功能

     1.可保存对Route和RouteHandler的引用（基类和接口）

     2.保存两个键值对，分别存储RouteValues 和用户自传入的DataToken

     3.提供一个方法从RouteValues 中读取文本值

using System;
using System.Globalization;
using System.Security.Permissions;
using System.Web;

namespace System.Web.Routing
{
    [AspNetHostingPermission(SecurityAction.LinkDemand, Level = AspNetHostingPermissionLevel.Minimal),
     AspNetHostingPermission(SecurityAction.InheritanceDemand, Level = AspNetHostingPermissionLevel.Minimal)]
    public class RouteData
    {
        // Fields
        private RouteValueDictionary _dataTokens;
        private IRouteHandler _routeHandler;
        private RouteValueDictionary _values;

        // Methods
        public RouteData()
        {
            this._values = new RouteValueDictionary();
            this._dataTokens = new RouteValueDictionary();
        }

        public RouteData(RouteBase route, IRouteHandler routeHandler)
        {
            this._values = new RouteValueDictionary();
            this._dataTokens = new RouteValueDictionary();
            this.Route = route;
            this.RouteHandler = routeHandler;
        }

        public string GetRequiredString(string valueName)
        {
            object obj2;
            if (this.Values.TryGetValue(valueName, out obj2))
            {
                string str = obj2 as string;
                if (!string.IsNullOrEmpty(str))
                    return str;
            }
            throw new InvalidOperationException(string.Format(CultureInfo.CurrentUICulture,
                                                              RoutingResources.RouteData_RequiredValue,
                                                              new object[] {valueName}));
        }

        // Properties
        public RouteValueDictionary DataTokens
        {
            get { return this._dataTokens; }
        }

        public RouteBase Route { get; set; }

        public IRouteHandler RouteHandler
        {
            get { return this._routeHandler; }
            set { this._routeHandler = value; }
        }

        public RouteValueDictionary Values
        {
            get { return this._values; }
        }
    }
}

3.RouteValueDictionary 类，实现了一个IDictionary<string, object>接口，包装了一个Dictionary<string, object>对象，其实没什么功能的，唯一的功能就是支持传入一个对象（最好是匿名类型的对象），并通过反射把它当作键值对使用，详情请看代码中加粗的部分。

using System;
using System.Collections;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Security.Permissions;
using System.Web;

namespace System.Web.Routing
{
    [AspNetHostingPermission(SecurityAction.InheritanceDemand, Level = AspNetHostingPermissionLevel.Minimal),
     AspNetHostingPermission(SecurityAction.LinkDemand, Level = AspNetHostingPermissionLevel.Minimal)]
    public class RouteValueDictionary : IDictionary<string, object>
    {
        // Fields
        private Dictionary<string, object> _dictionary;

        Constructors

        private void AddValues(object values)
        {
            if (values != null)
                foreach (PropertyDescriptor descriptor in TypeDescriptor.GetProperties(values))
                {
                    object obj2 = descriptor.GetValue(values);
                    this.Add(descriptor.Name, obj2);
                }
        }

        public bool ContainsValue(object value)
        {
            return this._dictionary.ContainsValue(value);
        }

        public Dictionary<string, object>.Enumerator GetEnumerator()
        {
            return this._dictionary.GetEnumerator();
        }

        public Dictionary<string, object>.KeyCollection Keys
        {
            get { return this._dictionary.Keys; }
        }

        public Dictionary<string, object>.ValueCollection Values
        {
            get { return this._dictionary.Values; }
        }

        IEnumerableKeyValuePairstring, object Members

        IEnumerable Members

        Implementation of ICollectionKeyValuePairstring,object

        Implementation of IDictionarystring,object
    }
}