ASP.NET MVC路由匹配检测组件RouteDebug.dll

　　以前使用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：https://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.