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我仍在学习使用 XML 和 C#。

我已经看过很多关于如何让它正常工作的地方，但我还无法解决这个问题，并且想知道是否有人能看到我哪里出错了？我正在尝试获取一个列表，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，它是总距离/持续时间对：/DirectionsResponse/route/leg/distance/value，然后我试图获取第二个列表，其中包含步骤版本：/DirectionsResponse/route/leg/步数/距离/值。如果我能让第二个工作，我可以弄清楚第一个。

非常感谢杰伊

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();

    }
}
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1 回答 1

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我认为您已经非常接近您想要的位置，只需进行一点调试即可使您顺利通过。

Here is a small snippet of what I threw together in LinqPad which I use to scratch together things before I commit them to code.

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();

The Dump method spits the result out to the LinqPad results. I had a list of 16 items in my steps results, and the total distance was a value of 286372.

Hope this helps.

于 2013-03-30T10:30:38.120 回答