读取XML到列表使用xmlread

我将读取gps点到列表的xml文件，然后将它们转换为多边形并保存在数据库中。这是我的问题，当我试着读文件的每一项都是一样的，你能帮我解决我的问题吗?提前感谢下面是我的代码:

  public List<string[]> loadXML(string xmlpath)
    {
        List<string[]> points = new List<string[]>();
        XmlReader xmlReader = XmlReader.Create(xmlpath);
        while (xmlReader.Read())
        {
            string[] item = new string[3];
            if ((xmlReader.NodeType == XmlNodeType.Element) && (xmlReader.Name == "trkpt"))
            {
                if (xmlReader.HasAttributes) 
                {
                    item[0] = xmlReader.GetAttribute("lat");
                    item[1] = xmlReader.GetAttribute("lon");
                }

            }
            if ((xmlReader.NodeType == XmlNodeType.Element) && (xmlReader.Name == "ele"))
            {

                    item[2] = xmlReader.ReadInnerXml();

            }
            points.Add(item);
        }
        return points;
    }

这是我的一段xml:

    <?xml version="1.0" encoding="UTF-8" standalone="no" ?>
<gpx xmlns="" xmlns:gpxx="" xmlns:wptx1="" xmlns:gpxtpx="" creator="GPSMAP 78s" version="1.1" xmlns:xsi="" xsi:schemaLocation="">
<metadata>
<link href=""><text>Garmin International</text></link>
<time>2014-06-18T13:55:07Z</time></metadata>
<trk><name>PV164B2KHE</name>
<extensions><gpxx:TrackExtension><gpxx:DisplayColor>Cyan</gpxx:DisplayColor></gpxx:TrackExtension></extensions>
<trkseg>
<trkpt lat="31.0403929744" lon="51.5264290944"><ele>2089.08</ele><time>2014-06-18T13:45:57Z</time></trkpt>
<trkpt lat="31.0403881129" lon="51.5264252387"><ele>2088.60</ele><time>2014-06-18T13:46:01Z</time></trkpt></trkseg></trk></gpx>

我想为每个点提取lat,lon和ele

var xmlDocument = XDocument.Load("path");
XNamepsace ns = xmlDocument.Root.GetDefaultNamespace();
var values = xmlDocument.Root
             .Descendants(ns + "trkpt")
             .Select(x => new
                    {
                        lat = (string)x.Attribute("lat"), 
                        lon = (string)x.Attribute("lon"), 
                        ele = (string)x.Element(ns + "ele")
                    });