/// <summary>
/// Send the request to the Bing Maps REST API
/// and deserialize the JSON response.
/// </summary>
private Response GetJsonResponse(string requestUrl)
{
HttpWebRequest request = WebRequest.Create(requestUrl) as HttpWebRequest;
using (HttpWebResponse response = request.GetResponse() as HttpWebResponse)
{
if (response.StatusCode != HttpStatusCode.OK)
{
throw new Exception(String.Format(
"Server error (HTTP {0}: {1}).",
response.StatusCode, response.StatusDescription));
}
DataContractJsonSerializer jsonSerializer =
new DataContractJsonSerializer(typeof(BingMapsRestV1.Response));
object objResponse =
jsonSerializer.ReadObject(response.GetResponseStream());
BingMapsRestV1.Response jsonResponse =
objResponse as BingMapsRestV1.Response;
return(jsonResponse);
}
}
/// <summary>
/// Calculates the shortest distance between two points based on their zipcodes,
/// and returns the value.
/// </summary>
private double CalculateDistance(string startPoint, string endPoint)
{
double distance = 0.0;
// Required start and end waypoint parameters (location string
// or a pair of latitude and longitude coordinates).
string fromAddress = startPoint;
string toAddress = endPoint;
// Optional route calculation parameters:
// Optimize route for the shortest distance.
string optimize = "distance";
// Driving travel mode: driving/walking/transit
string travelMode = "driving";
// Measure distance: km/mi
string distanceUnit = "km";
// User needs to put here his/her Bing Maps Key
string BingMapsKey = "Au9tmAwIDZ2XAQVedm85L51EujHtSfgvdFBLpLXBvH-p94kNrokavf00POMu74Xz";
// Create a REST request for the route's details.
string requestUrl = "http://dev.virtualearth.net/REST/v1/Routes" +
"?output=json" + "&key=" + BingMapsKey + "&wp.0=" + fromAddress +
"&wp.1=" + toAddress + "&optimize=" + optimize +
"&travelMode=" + travelMode + "&distanceUnit=" + distanceUnit;
// Send the request and parse the response.
BingMapsRestV1.Response jsonResponse = GetJsonResponse(requestUrl);
// Get the shortest distance
distance = (from Route r in jsonResponse.ResourceSets[0].Resources
orderby r.TravelDistance ascending
select r.TravelDistance).First();
return(distance);
}
