应用程序处理的映射示例如下：

http://samplesite/userid/1234 – http://samplesite/users.aspx?userid=1234
http://samplesite/userid/1235 – http://samplesite/users.aspx?userid=1235

此示例使用查询字符串，并避免任何修改aspx页面上的代码的要求。

步骤1 – 将必要的条目添加到web.config

<system.web>
<compilation debug="true">
        <assemblies>
            …
            <add assembly="System.Web.Routing,Version=3.5.0.0,Culture=neutral,PublicKeyToken=31BF3856AD364E35"/>
        </assemblies>
    </compilation>
…
    <httpModules>
    …
        <add name="UrlRoutingModule" type="System.Web.Routing.UrlRoutingModule,System.Web.Routing,PublicKeyToken=31BF3856AD364E35" />
        </httpModules>
</system.web>
<system.webServer>
    …
    <modules>
        …
        <add name="UrlRoutingModule" type="System.Web.Routing.UrlRoutingModule,PublicKeyToken=31BF3856AD364E35"/>
    </modules>
    <handlers
…   
        <add name="UrlRoutingHandler" preCondition="integratedMode" verb="*" path="UrlRouting.axd" type="System.Web.HttpForbiddenHandler,System.Web,Version=2.0.0.0,PublicKeyToken=b03f5f7f11d50a3a"/>
    </handlers>
</system.webServer>

步骤2 – 在global.asax中添加路由表

定义从友好的URL到aspx页面的映射，保存请求的用户名以供以后使用。

void Application_Start(object sender,EventArgs e)
{
    RegisterRoutes(RouteTable.Routes);
}

public static void RegisterRoutes(RouteCollection routes)
{
    routes.Add("UseridRoute",new Route
    (
       "userid/{userid}",new CustomRouteHandler("~/users.aspx")
    ));
}

步骤3 – 实现路由处理程序

在发生路由之前，将querystring添加到当前上下文中。

using System.Web.Compilation;
using System.Web.UI;
using System.Web;
using System.Web.Routing;

public class CustomRouteHandler : IRouteHandler
{
    public CustomRouteHandler(string virtualPath)
    {
        this.VirtualPath = virtualPath;
    }

    public string VirtualPath { get; private set; }

    public IHttpHandler GetHttpHandler(RequestContext
          requestContext)
    {
        // Add the querystring to the URL in the current context
        string queryString = "?userid=" + requestContext.RouteData.Values["userid"];
        HttpContext.Current.RewritePath(
          string.Concat(
          VirtualPath,queryString)); 

        var page = BuildManager.CreateInstanceFromVirtualPath
             (VirtualPath,typeof(Page)) as IHttpHandler;
        return page;
    }
}

来自users.aspx的代码

aspx页面上的代码供参考。

protected void Page_Load(object sender,EventArgs e)
{
    string id = Page.Request.QueryString["userid"];
    switch (id)
    {
        case "1234":
            lblUserId.Text = id;
            lblUserName.Text = "Bill";
            break;
        case "1235":
            lblUserId.Text = id;
            lblUserName.Text = "Claire";
            break;
        case "1236":
            lblUserId.Text = id;
            lblUserName.Text = "David";
            break;
        default:
            lblUserId.Text = "0000";
            lblUserName.Text = "Unknown";
            break;
}