在c＃或asp.net中找到地图上两个地方之间的距离以及汽车路线

Question

我正在使用下面的代码来找出两个位置之间的距离。当我将自己的距离（英里）与其他站点进行比较时，我的值有误。

提取我想要以英里为单位的距离（通过汽车定向）

public double getDistance(string origin, string destination)
    {
        System.Threading.Thread.Sleep(1000);
        double distance = 0;
        string url = "http://maps.googleapis.com/maps/api/directions/json?origin=" + origin + "&destination=" + destination + "&sensor=false";
        string requesturl = url;

        string content = fileGetContents(requesturl);
        JObject o = JObject.Parse(content);
        try
        {
            distance = (int)o.SelectToken("routes[0].legs[0].distance.value");
            return distance;
        }
        catch
        {
            return 0;
        }
    }

    protected string fileGetContents(string fileName)
    {
        string sContents = string.Empty;
        string me = string.Empty;
        try
        {
            if (fileName.ToLower().IndexOf("http:") > -1)
            {
                System.Net.WebClient wc = new System.Net.WebClient();
                byte[] response = wc.DownloadData(fileName);
                sContents = System.Text.Encoding.ASCII.GetString(response);

            }
            else
            {
                System.IO.StreamReader sr = new System.IO.StreamReader(fileName);
                sContents = sr.ReadToEnd();
                sr.Close();
            }
        }
        catch { sContents = "unable to connect to server "; }
        return sContents;
    }

Answer 1

您从SelectToken收到的值以米为单位。 要将其更改为英里，应将该值乘以0.00062137。

distance = (int)o.SelectToken("routes[0].legs[0].distance.value");
return distance*0.00062137;