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private class QueryPropagatingRoute : RouteBase {
private readonly RouteBase target;
private readonly string[] queryStringKeys;
public QueryPropagatingRoute(RouteBase target, params string[] queryStringKeys) { = target;
this.queryStringKeys = queryStringKeys;
public override VirtualPathData GetVirtualPath(RequestContext requestContext, RouteValueDictionary values) {
foreach (var key in this.queryStringKeys) {
if (values.ContainsKey(key))
values.Add(key, requestContext.HttpContext.Request.QueryString[key]);
var path = target.GetVirtualPath(requestContext, values);
return path;
public override RouteData GetRouteData(HttpContextBase httpContext) {
return target.GetRouteData(httpContext);
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