ASP.NET MVC路由匹配检测组件RouteDebug.dll
摘要：以前使用RouteMonitor.dll进行MVC路由检测URL路径的映射匹配情况，现RouteMonitor.dll已经将名称改为了RouteDebug.dll，本文将讲述RouteDebug.dll的使用方法
以前我们使用RouteMonitor.dll进行MVC路由检测URL路径的映射匹配情况。由于公司电脑没有此组件，所以上网搜了下，结果才发现RouteMonitor.dll已经将名称改为了RouteDebug.dll 。
具体参阅 官方网站。
下载地址：http://files.cnblogs.com/Capricornus/RouteDebug-Binary.zip
使用方法:
1. 在MVC项目中添加引用此组件
2. 在全局应用程序类Global.asax.cs中设置代码
protected void Application_Start()
{
RegisterRoutes(RouteTable.Routes);
RouteDebug.RouteDebugger.RewriteRoutesForTesting(RouteTable.Routes);
//以前RouteMonitor方式
//RouteMonitor.RouteDebugger.RewriteRoutesForTesting(RouteTable.Routes);
}
3.匹配路由如下图: 
我们可以使用Reflector反编译这个RouteDebugger.dll组件，查看一下原理。如图：
RouteDebug中包含了DebugHttpHandler、DebugRoute、DebugRouteHandler、RouteDebugger这4个类。
首先从我们调用RouteDebug.RouteDebugger.RewriteRoutesForTesting的着手。
RouteDebugger类：
public static class RouteDebugger
{
// Methods
public static void RewriteRoutesForTesting(RouteCollection routes)
{
using (routes.GetReadLock())
{
bool flag = false;
foreach (RouteBase base2 in routes)
{
Route route = base2 as Route;
if (route != null)
{
route.RouteHandler = new DebugRouteHandler();
}
if (route == DebugRoute.Singleton)
{
flag = true;
}
}
if (!flag)
{
routes.Add(DebugRoute.Singleton);
}
}
}
}
首先，整个代码是使用System.Web.Routing命名空间下的RouteCollection.GetReadLock()锁定的，提供一个对象，用于管理在从集合中检索对象时的线程安全性;然后遍历我们传过来的路由集合参数。用RouteDebug中的DebugRouteHandler去替换原有RouteHandler，以便改变Http处理程序的方向，接着将Singletion属性的值添加到路由结合中。
DebugRoute类:
public class DebugRoute : Route
{
private static DebugRoute singleton = new DebugRoute();
private DebugRoute() : base("{*catchall}", new DebugRouteHandler())
{
}
public static DebugRoute Singleton
{
get
{
return singleton;
}
}
}
DebugRoute继承与Route类,构造函数实现了构造可捕获所有URL地址的Route。
DebugRouteHandler路由处理程序类:
public class DebugRouteHandler : IRouteHandler
{
// Methods
public IHttpHandler GetHttpHandler(RequestContext requestContext)
{
DebugHttpHandler handler = new DebugHttpHandler();
handler.RequestContext = requestContext;
return handler;
}
}
实现IHttpHanlder接口的实例化对象,传入了一个RequestContext对象实例。
DebugHttpHandler类：
public class DebugHttpHandler : IHttpHandler
{
[CompilerGenerated]
private RequestContext <RequestContext>k__BackingField;
private static string FormatRouteValueDictionary(RouteValueDictionary values)
{
if ((values == null) || (values.Count == 0))
{
return "(null)";
}
string str = string.Empty;
foreach (string str2 in values.Keys)
{
str = str + string.Format("{0} = {1}, ", str2, values[str2]);
}
if (str.EndsWith(", "))
{
str = str.Substring(0, str.Length - 2);
}
return str;
}
public void ProcessRequest(HttpContext context)
{
string str = string.Empty;
if (context.Request.QueryString.Count > 0)
{
RouteValueDictionary dictionary = new RouteValueDictionary();
foreach (string str2 in context.Request.QueryString.Keys)
{
dictionary.Add(str2, context.Request.QueryString[str2]);
}
VirtualPathData virtualPath = RouteTable.Routes.GetVirtualPath
(this.RequestContext, dictionary);
if (virtualPath != null)
{
str = "<p><label>Generated URL</label>: ";
str = str + "<strong style=\"color: #00a;\">"
+ virtualPath.VirtualPath + "</strong>";
Route route = virtualPath.Route as Route;
if (route != null)
{
str = str + " using the route \"" + route.Url + "\"</p>";
}
}
}
string format = "<html>\r\n<head>\r\n
<title>Route Tester</title>\r\n <style>\r\n
body, td, th {{font-family: verdana; font-size: small;}}\r\n
.message {{font-size: .9em;}}\r\n
caption {{font-weight: bold;}}\r\n
tr.header {{background-color: #ffc;}}\r\n
label {{font-weight: bold; font-size: 1.1em;}}\r\n
.false {{color: #c00;}}\r\n
.true {{color: #0c0;}}\r\n
</style>\r\n</head>\r\n<body>\r\n<h1>Route Tester</h1>\r\n<div id=\"main\">\r\n
<p class=\"message\">\r\n
Type in a url in the address bar to see which defined routes match it. \r\n
A {{*catchall}} route is added to the list of routes automatically in \r\n
case none of your routes match.\r\n </p>\r\n <p class=\"message\">\r\n
To generate URLs using routing, supply route values via the query string. example:
<code>http://localhost:14230/?id=123</code>\r\n </p>\r\n
<p><label>Matched Route</label>: {1}</p>\r\n {5}\r\n
<div style=\"float: left;\">\r\n
<table border=\"1\" cellpadding=\"3\" cellspacing=\"0\" width=\"300\">\r\n
<caption>Route Data</caption>\r\n
<tr class=\"header\"><th>Key</th><th>Value</th></tr>\r\n
{0}\r\n </table>\r\n </div>\r\n <div style=\"float: left; margin-left: 10px;\">\r\n
<table border=\"1\" cellpadding=\"3\" cellspacing=\"0\" width=\"300\">\r\n
<caption>Data Tokens</caption>\r\n
<tr class=\"header\"><th>Key</th><th>Value</th></tr>\r\n
{4}\r\n </table>\r\n </div>\r\n <hr style=\"clear: both;\" />\r\n
<table border=\"1\" cellpadding=\"3\" cellspacing=\"0\">\r\n
<caption>All Routes</caption>\r\n <tr class=\"header\">\r\n
<th>Matches Current Request</th>\r\n <th>Url</th>\r\n
<th>Defaults</th>\r\n <th>Constraints</th>\r\n
<th>DataTokens</th>\r\n </tr>\r\n {2}\r\n
</table>\r\n <hr />\r\n <h3>Current Request Info</h3>\r\n
<p>\r\n
AppRelativeCurrentExecutionFilePath is the portion of the request that Routing
acts on.\r\n </p>\r\n
<p><strong>AppRelativeCurrentExecutionFilePath</strong>: {3}</p>\r\n</div>\r\n
</body>\r\n</html>";
string str4 = string.Empty;
//RouteData类包含所请求路由的相关值
RouteData routeData = this.RequestContext.RouteData;
//获得路由的URL参数值和默认值的集合
RouteValueDictionary values = routeData.Values;
//获取路由的对象
RouteBase base2 = routeData.Route;
string str5 = string.Empty;
using (RouteTable.Routes.GetReadLock())
{
foreach (RouteBase base3 in RouteTable.Routes)
{
//返回有关集合中与指定值匹配的路由的信息，如果为空，说明不匹配
bool flag = base3.GetRouteData(this.RequestContext.HttpContext) != null;
string str6 = string.Format("<span class=\"{0}\">{0}</span>", flag);
string url = "n/a";
string str8 = "n/a";
string str9 = "n/a";
string str10 = "n/a";
Route route2 = base3 as Route;
if (route2 != null)
{
//如果路由不为空，得到匹配的Url路由
url = route2.Url;
//得到默认的Url匹配规则信息
str8 = FormatRouteValueDictionary(route2.Defaults);
//得到约束的Url匹配规则信息
str9 = FormatRouteValueDictionary(route2.Constraints);
//得到命名空间的Url匹配规则信息
str10 = FormatRouteValueDictionary(route2.DataTokens);
}
str5 = str5 + string.Format
("<tr><td>{0}</td><td>{1}</td><td>{2}</td>
<td>{3}</td><td>{4}</td></tr>",
new object[] { str6, url, str8, str9, str10 });
}
}
string str11 = "n/a";
string str12 = "";
//如果只被{@cacheall}捕获时，提示不匹配
if (base2 is DebugRoute)
{
str11 = "<strong class=\"false\">NO MATCH!</strong>";
}
else
{
//匹配的路由信息
foreach (string str2 in values.Keys)
{
str4 = str4 + string.Format
("\t<tr><td>{0}</td><td>{1} </td></tr>", str2, values[str2]);
}
foreach (string str2 in routeData.DataTokens.Keys)
{
str12 = str12 + string.Format("\t<tr><td>{0}</td><td>{1} </td></tr>",
str2, routeData.DataTokens[str2]);
}
Route route3 = base2 as Route;
if (route3 != null)
{
str11 = route3.Url;
}
}
context.Response.Write(string.Format(format, new object[]
{ str4, str11, str5, context.Request.AppRelativeCurrentExecutionFilePath, str12, str }));
}
public bool IsReusable
{
get
{
return true;
}
}
public RequestContext RequestContext
{
[CompilerGenerated]
get
{
return this.<RequestContext>k__BackingField;
}
[CompilerGenerated]
set
{
this.<RequestContext>k__BackingField = value;
}
}
}
通过ProcessRequest方法来处理请求,最后呈现在路由检测的页面上。
首先从RequestContext.RouteData可以得到RouteData类，RouteData类包含所请求路由的相关值。从RouteData.Values获取路由的URL参数值和默认值集合,在从RouteData.Route获取路由的对象,在获取有关集合中与指定值匹配的路由信息.