Bing Maps Route Service CalculateRoute returns "An error occurred while processing the request."

Question

I've written a Silverlight class to consume the Bing Maps Routing Service. I'm creating an array of Waypoint objects from lat/long data that I have stored in a database, and sending that to the CalculateRoute method of the webservice in order to get a route back, but I am unable to successfully get a route back. The response always contains the error "An error occurred while processing the request." I'm stumped. Any ideas about how I could solve this or at least get a more helpful error/exception out of the service? Here's the method that calls the service:

public void CalculateRoute(Waypoint[] waypoints)
{
 request = new RouteRequest();
    request.Waypoints = new ObservableCollection<Waypoint>();

    for (int idx = 0; idx < waypoints.Length; idx++)
    {
     request.Waypoints.Add(waypoints[idx] as Waypoint);
    }

    request.ExecutionOptions = new ExecutionOptions();
 request.ExecutionOptions.SuppressFaults = true;

 request.Options = new RouteOptions();
 request.Options.Optimization = RouteOptimization.MinimizeTime;
 request.Options.RoutePathType = RoutePathType.Points;
 request.Options.Mode = TravelMode.Walking;
 request.Options.TrafficUsage = TrafficUsage.TrafficBasedRouteAndTime;

    _map.CredentialsProvider.GetCredentials(
 (Credentials credentials) =>
 {
  request.Credentials = credentials;
     RouteClient.CalculateRouteAsync(request);
 });
}

I then have a callback that handles the response, but I have been unable to get a successful response. I've tried making sure the maxBufferSize and maxReceivedMessageSize are set correctly and that timeouts are set correctly, but to no avail. Any help would be much appreciated.

Answer 1

It appears that this line:

request.Options.TrafficUsage = TrafficUsage.TrafficBasedRouteAndTime;

was the culprit. Apparently if you've got that option set and request a route for somewhere that doesn't have traffic data, it dies rather than just ignoring it.