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Routing in Virtual Earth Web Service

  • Article

I’ve been working on this one for a while and it kind of completes the basics for getting started with the Virtual Earth Web Service. The Routing Service in VEWS allows for route calculation and itinerary creation.  The following will get you started using the routing service. In this sample I’ll instantiate the service request, pass the points into an array, set options for the route object, get the route object back and parse the information into a table for viewing.

First things first, add a web reference to the route service.

image

Next, the following code will provide you with the route itinerary starting at lat/lon (40, –120) then stopping for some Starbucks coffee at lat/lon (40.5, –120.5) and ending at lat/lon (41, –121). The inline documentation should help explain what’s happening. The ASPX and Code-behind are available below.

//////////////////////
//Route.ASPX.CS
//////////////////////

using System;
using System.Web;
using System.Web.UI.WebControls;
using VEWSX.TokenService;
using VEWSX.RouteService;

namespace VEWSX
{
public partial class Route : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
//Labels are hidden when the page loads
Label3.Visible = false;
Table1.Visible = false;
}

        protected void Button1_Click(object sender, EventArgs e)
{
//Authenticate and get a token
string myToken = Authenticate.Authentication(Page.Request.UserHostAddress);
//Instantiate Route Request
RouteRequest myRouteRequest = new RouteRequest();
myRouteRequest.Credentials = new RouteService.Credentials();
myRouteRequest.Credentials.Token = myToken;
//Create an array of points (this could also be addresses, versus lat/lons
RouteService.Waypoint[] waypoints = new RouteService.Waypoint[3];
waypoints[0] = new RouteService.Waypoint();
waypoints[0].Description = "Start";
waypoints[0].Location = new RouteService.Location();
waypoints[0].Location.Latitude = 40;
waypoints[0].Location.Longitude = -120;
waypoints[1] = new RouteService.Waypoint();
waypoints[1].Description = "Starbucks";
waypoints[1].Location = new RouteService.Location();
waypoints[1].Location.Latitude = 40.5;
waypoints[1].Location.Longitude = -120.5;
waypoints[2] = new RouteService.Waypoint();
waypoints[2].Description = "End";
waypoints[2].Location = new RouteService.Location();
waypoints[2].Location.Latitude = 41;
waypoints[2].Location.Longitude = -121;
//Pass the array into the Route Request object
myRouteRequest.Waypoints = waypoints;
//Creation Route options
RouteOptions myRouteOptions = new RouteOptions();
//Set travel mode - Driving or Walking
myRouteOptions.Mode = TravelMode.Driving;
//Set the optimization type - MinimizeDistance or MinimizeTime
myRouteOptions.Optimization = RouteOptimization.MinimizeDistance;
//Set the use of traffic conditions - TrafficBasedRouteAndTime, TrafficBasedTime, or None
myRouteOptions.TrafficUsage = TrafficUsage.None;
//Pass the Route Options to the Route Object
myRouteRequest.Options = myRouteOptions;
//Instatiate Route Service Request
RouteService.RouteServiceClient myRouteServiceClient = new RouteService.RouteServiceClient();
//Instantiate Route response
RouteService.RouteResponse myRouteResponse;
//Calculate the Route
myRouteResponse = myRouteServiceClient.CalculateRoute(myRouteRequest);
//Instantiate Route Leg
RouteService.RouteLeg myRouteLeg;
//Create directions, parse them and put them in a table
string directions = "";
TableRow tRow = new TableRow();
Table1.Rows.Add(tRow);
TableCell tCell0 = new TableCell();
tCell0.VerticalAlign = VerticalAlign.Top;
tRow.Cells.Add(tCell0);
tCell0.Text = "";
for (int i = 0; i < myRouteResponse.Result.Legs.Length; i++)
{
myRouteLeg = myRouteResponse.Result.Legs[i];

                for (int j = 0; j < myRouteLeg.Itinerary.Length; j++)
{
directions = directions + myRouteLeg.Itinerary[j].Text
+ " (" + Math.Round(myRouteLeg.Itinerary[j].Summary.Distance, 2) + " miles, "
+ (myRouteLeg.Itinerary[j].Summary.TimeInSeconds / 60) + "mins)"
+ "<br/>";
}
}

            tCell0.Text += directions;
Label3.Visible = true;
Table1.Visible = true;
}
}
}

//////////////////////
//Route.ASPX
//////////////////////

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Route.aspx.cs" Inherits="VEWSX.Route" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "https://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="https://www.w3.org/1999/xhtml" >
<head runat="server">
<title>Untitled Page</title>
</head>
<body>
<form id="form1" runat="server">
<br />
<p>
<asp:Button ID="Button1" runat="server" onclick="Button1_Click"
Text="Get Route" />
</p>
<asp:Label ID="Label3" runat="server" Text="Results"></asp:Label>
<br />
<asp:Table ID="Table1" runat="server" Height="387px" Width="444px">
</asp:Table>
</form>
</body>
</html>

Here’s what you should end up with:

image

Pretty simple, but hopefully this will provide you with the information you need to get your routing application up and running. I didn’t do error handling, so make sure you include that with your application. Specifically, when you’re making your service calls.

CP

Comments

  • Anonymous
    January 31, 2009
    I get an error running the code. I gets a tokeb but fails getting the route:                RouteService.RouteResponse routeResponse =                    routeService.CalculateRoute(routeRequest); The reported error is
  •   ex	{&quot;An error occurred while processing the request.&quot;}	System.Web.Services.Protocols.SoapException

Drilling into ex  (The Soap exception)  it seems that validation isn't the problem: InnerXml "<ResponseSummary xmlns="http://dev.virtualearth.net/webservices/v1/common" xmlns:i="http://www.w3.org/2001/XMLSchema-instance"><AuthenticationResultCode>ValidCredentials</AuthenticationResultCode><Copyright>...Copyright><FaultReason>An error occurred while processing the request.</FaultReason><StatusCode>ServerError</StatusCode><TraceId>b79b0a7db86b41a8883f92dff7c69375|808</TraceId></ResponseSummary>" ?????????????

  • Anonymous
    February 27, 2009
    I get the same error. I can get the routing service to work from an ASP.NET webpage, but when I try to access it from a class library in SQL Server 2008 I get the 'An error occurred while processing you request' thrown from the CalculateRoute method, with no further details. I am getting the token generated ok because I can use the geocoding service from within the same library.... was this ever resolved?  

  • Anonymous
    February 27, 2009
    Don't know if it's relevant or not, but when I create the ASP.Net page in VS2008, I add a service reference to the routing service which automatically generates a RouteServiceClient class. When I create a class library for importing into SQL Server I have to manually create a proxy for the service using wsdl.exe, which instead generates a RouteService class... I don't understand why the name differs, although the class appears to be identical.

  • Anonymous
    March 11, 2009
    The comment has been removed

  • Anonymous
    March 11, 2009
    The comment has been removed

  • Anonymous
    June 01, 2009
    Hey Chris. Thanks for posting this article. I was wondering if you knew how to retrieve the optimized coordinates. For instance, you have passed in the coordinates in your RouteService.Waypoint[] waypoints variable. When you call the web service setting the optimization to RouteOptimization.MinimizeDistance, is it possible to retrieve the optimized order of the coordinates? I've been searching around the web for this, but haven't found anything yet. Thanks! Ankit