static KeyValuePair <string, IHttpRoute>[] CopyRouteEntries(HttpRouteCollection routes)
{
Contract.Requires(routes != null);
Contract.Ensures(Contract.Result <KeyValuePair <string, IHttpRoute>[]>() != null);
var items = new KeyValuePair <string, IHttpRoute> [routes.Count];
try
{
routes.CopyTo(items, 0);
}
catch (NotSupportedException) when(routes.GetType().FullName == "System.Web.Http.WebHost.Routing.HostedHttpRouteCollection")
{
var keys = GetRouteKeys(routes);
for (var i = 0; i < keys.Count; i++)
{
var key = keys[i];
var route = routes[key];
items[i] = new KeyValuePair <string, IHttpRoute>(key, route);
}
}
return(items);
}
static ICollection <string> GetDictionaryKeys(HttpRouteCollection routes)
{
// HACK: System.Web.Routing.RouteCollection doesn't expose the names associated with registered routes. The
// HostedHttpRouteCollection could have provided an adapter to support it, but didn't. Instead, it always throws
// NotSupportedException for the HttpRouteCollection.CopyTo method. This only happens when hosted on IIS. The
// only way to get the keys is use reflection to poke at the underlying dictionary.
var routeCollection = routes.GetType().GetField("_routeCollection", Instance | NonPublic).GetValue(routes);
var dictionary = routeCollection.GetType().GetField("_namedMap", Instance | NonPublic).GetValue(routeCollection);
var keys = (ICollection <string>)dictionary.GetType().GetRuntimeProperty("Keys").GetValue(dictionary, null);
return(keys);
}
/// <summary>
/// Returns the route collection as a read-only dictionary mapping configured names to routes.
/// </summary>
/// <param name="routes">The <see cref="HttpRouteCollection">route collection</see> to convert.</param>
/// <returns>A new <see cref="IReadOnlyDictionary{TKey, TValue}">read-only dictonary</see> of
/// <see cref="IHttpRoute">routes</see> mapped to their name.</returns>
public static IReadOnlyDictionary <string, IHttpRoute> ToDictionary(this HttpRouteCollection routes)
{
Arg.NotNull(routes, nameof(routes));
Contract.Ensures(Contract.Result <IReadOnlyDictionary <string, IHttpRoute> >() != null);
const string HostedHttpRouteCollection = "System.Web.Http.WebHost.Routing.HostedHttpRouteCollection";
try
{
return(routes.CopyToDictionary());
}
catch (NotSupportedException) when(routes.GetType().FullName == HostedHttpRouteCollection)
{
return(routes.BuildDictionaryFromKeys());
}
}
/// <summary>
/// Returns the route collection as a read-only dictionary mapping configured names to routes.
/// </summary>
/// <param name="routes">The <see cref="HttpRouteCollection">route collection</see> to convert.</param>
/// <returns>A new <see cref="IReadOnlyDictionary{TKey, TValue}">read-only dictonary</see> of
/// <see cref="IHttpRoute">routes</see> mapped to their name.</returns>
public static IReadOnlyDictionary <string, IHttpRoute> ToDictionary(this HttpRouteCollection routes)
{
if (routes == null)
{
throw new ArgumentNullException(nameof(routes));
}
const string HostedHttpRouteCollection = "System.Web.Http.WebHost.Routing.HostedHttpRouteCollection";
try
{
return(routes.CopyToDictionary());
}
catch (NotSupportedException) when(routes.GetType().FullName == HostedHttpRouteCollection)
{
return(routes.BuildDictionaryFromKeys());
}
}