我仍在学习使用XML和C#。
我已经看了很多关于如何使其正常工作的地方,但我还是无法解决这个问题,并且想知道是否有人能看到我哪里出错了? 我试图得到一个列表,其中包含两个单独场合的距离和持续时间的节点值。首先应该只是一对,即总的dist / duration对:/ DirectionsResponse / route / leg / distance / value,然后我试图获得第二个列表,其中包含步骤版本:/ DirectionsResponse / route / leg /步骤/距离/值。如果我能让第二个工作,我可以弄清楚第一个。
非常感谢 Jaie
public class MyNode
{
public string Distance { get; set; }
public string Duration { get; set; }
}
public class Program
{
static void Main(string[] args)
{
//The full URI
//http://maps.googleapis.com/maps/api/directions/xml?`enter code here`origin=Sydney+australia&destination=Melbourne+Australia&sensor=false
//refer: https://developers.google.com/maps/documentation/webservices/
string originAddress = "Canberra+Australia";
string destinationAddress = "sydney+Australia";
StringBuilder url = new StringBuilder();
//http://maps.googleapis.com/maps/api/directions/xml?
//different request format to distance API
url.Append("http://maps.googleapis.com/maps/api/directions/xml?");
url.Append(string.Format("origin={0}&", originAddress));
url.Append(string.Format("destination={0}", destinationAddress));
url.Append("&sensor=false&departure_time=1343605500&mode=driving");
WebRequest request = HttpWebRequest.Create(url.ToString());
var response = request.GetResponse();
var stream = response.GetResponseStream();
XDocument xdoc = XDocument.Load(stream);
List<MyNode> routes =
(from route in xdoc.Descendants("steps")
select new MyNode
{
Duration = route.Element("duration").Value,
Distance = route.Element("distance").Value,
}).ToList<MyNode>();
foreach (MyNode route in routes)
{
Console.WriteLine("Duration = {0}", route.Duration);
Console.WriteLine("Distance = {0}", route.Distance);
}
stream.Dispose();
}
}
答案 0 :(得分:0)
我认为你非常接近你想要的地方,只需要一点调试就可以让你上线。
以下是我在LinqPad中汇总的一小部分内容,在我提交代码之前,我将其用于一起划分。
var origin = "Canberra+Australia";
var dest = "sydney+Australia";
var baseUrl = "http://maps.googleapis.com/maps/api/directions/xml?origin={0}&destination={1}&sensor=false&departure_time=1343605500&mode=driving";
var req = string.Format(baseUrl, origin, dest);
var resp = new System.Net.WebClient().DownloadString(req);
var doc = XDocument.Parse(resp);
var total = doc.Root.Element("route").Element("leg").Element("distance").Element("value").Value;
total.Dump();
var steps = (from row in doc.Root.Element("route").Element("leg").Elements("step")
select new
{
Duration = row.Element("duration").Element("value").Value,
Distance = row.Element("distance").Element("value").Value
}).ToList();
steps.Dump();
Dump方法将结果吐出到LinqPad结果中。我在步骤结果中列出了16个项目,总距离值为286372。
希望这有帮助。