How do I get Route name from RouteData?

If you're working with a small subset of important routes you need to check for (a special case or two) you can just do this :

if (routeData.Route == RouteTable.Routes["gallery-route"])
{
   // current route is 'gallery-route'
}

A common reason for needing the route name is for debugging purposes. A quick and dirty way to do this follows - but you'll need to add each route name to the array of names. Should be fine for debugging - especially if the code isn't running during production.

// quick and dirty way to get route name
public string GetRouteName(RouteData routeData) 
{
    foreach (string name in new [] { "gallery-route", 
                                     "products-route", 
                                     "affiliate-route", 
                                     "default" }) 
    {
        if (routeData.Route == RouteTable.Routes[name])
        {
            return name;
        }
    }
    return "UNKNOWN-ROUTE";   // or throw exception
}

For anything beyond this you should take the (minimal) time needed for @haacked's solution.

Here's an implementation of @haacked's suggestion - with also a simple 'razor' table to display route data.

Note: You may not have realized that all the standard 'MapRoute' methods are actually extension methods. Therefore we cannot use the same name. I've just called it 'MapRoute2', because right now thats all I can think of.

You must replace all calls to MapRoute with a call to MapRoute2, don't forget all AreaRegistration files as well as global.asax.cs

Extension method:

public static class RouteNameExtensions
{
    // RouteCollection
    public static Route MapRoute2(this RouteCollection routes, string name, string url)
    {
        return AddRouteNameDataToken(name, routes.MapRoute(name, url));
    }

    public static Route MapRoute2(this RouteCollection routes, string name, string url, object defaults)
    {
        return AddRouteNameDataToken(name, routes.MapRoute(name, url, defaults));
    }

    public static Route MapRoute2(this RouteCollection routes, string name, string url, string[] namespaces)
    {
        return AddRouteNameDataToken(name, routes.MapRoute(name, url, namespaces));
    }

    public static Route MapRoute2(this RouteCollection routes, string name, string url, object defaults, object constraints)
    {
        return AddRouteNameDataToken(name, routes.MapRoute(name, url, defaults, constraints));
    }

    public static Route MapRoute2(this RouteCollection routes, string name, string url, object defaults, string[] namespaces)
    {
        return AddRouteNameDataToken(name, routes.MapRoute(name, url, defaults, namespaces));
    }

    public static Route MapRoute2(this RouteCollection routes, string name, string url, object defaults, object constraints, string[] namespaces)
    {
        return AddRouteNameDataToken(name, routes.MapRoute(name, url, defaults, constraints, namespaces));
    }

    // AreaRegistrationContext
    public static Route MapRoute2(this AreaRegistrationContext routes, string name, string url)
    {
        return AddRouteNameDataToken(name, routes.MapRoute(name, url));
    }

    public static Route MapRoute2(this AreaRegistrationContext routes, string name, string url, object defaults)
    {
        return AddRouteNameDataToken(name, routes.MapRoute(name, url, defaults));
    }

    public static Route MapRoute2(this AreaRegistrationContext routes, string name, string url, string[] namespaces)
    {
        return AddRouteNameDataToken(name, routes.MapRoute(name, url, namespaces));
    }

    public static Route MapRoute2(this AreaRegistrationContext routes, string name, string url, object defaults, object constraints)
    {
        return AddRouteNameDataToken(name, routes.MapRoute(name, url, defaults, constraints));
    }

    public static Route MapRoute2(this AreaRegistrationContext routes, string name, string url, object defaults, string[] namespaces)
    {
        return AddRouteNameDataToken(name, routes.MapRoute(name, url, defaults, namespaces));
    }

    public static Route MapRoute2(this AreaRegistrationContext routes, string name, string url, object defaults, object constraints, string[] namespaces)
    {
        return AddRouteNameDataToken(name, routes.MapRoute(name, url, defaults, constraints, namespaces));
    }

    private static Route AddRouteNameDataToken(string name, Route route)
    {
        route.DataTokens["route-name"] = name;
        return route;
    }
}

Here's a simple razor .cshtml file I'm using to display routing information:

<table class="basic-table">
    <tr>
        <th>Route Key</th>
        <th>Value</th>
    </tr>

    <tr>
        <td><strong>Route name</strong></td>
        <td>@ViewContext.RouteData.DataTokens["route-name"]</td>
    </tr>

    @foreach (var route in ViewContext.RouteData.Values)
    {
        <tr>
            <td>- @route.Key</td>
            <td>@(route.Value ?? "<null>")</td>
        </tr>
    }
    @foreach (var route in ViewContext.RouteData.DataTokens.Where(x=>x.Key != "route-name"))
    {
        <tr>
            <td><strong>@route.Key</strong></td>
            <td>@(route.Value ?? "<null>")</td>
        </tr>
    }

</table>

You can add every route parameters and its not necessary this parameters be in your Url: You can put your route name as a parameter like this inGlobal.asax:

 routes.MapPageRoute("Page",
                "Page-{ID}",
               "~/Item_show.aspx", false, new RouteValueDictionary{ { "RouteName" , "Page" }});

And Access it in your page:

if (RouteData.Values["RouteName"] != null)
           {
               if (RouteData.Values["RouteName"].ToString() == "Page")
               {
                   Response.Write(RouteData.Values["RouteName"]);

               }  

           }

Best way is not hard way.