我有一个XML feed,我通过httpwebrequest检索过,而且我在解析feed时遇到问题,因为它与我过去尝试过的时间不同。到目前为止,我有网址 http://webservices.nextbus.com/service/publicXMLFeed?command=routeConfig&a=sf-muni&r=N
我存储在
中 XDocument doc = XDocument.Parse(feedString);
我知道当我为了调试目的将所有内容都放在列表框中时,我得到了所有内容,我只是在解析feed时遇到了问题:
<body copyright="All data copyright San Francisco Muni 2012.">
<route tag="N" title="N-Judah" color="003399" oppositeColor="ffffff" latMin="37.7601699" latMax="37.7932299" lonMin="-122.5092" lonMax="-122.38798">
<stop tag="5240" title="King St & 4th St" lat="37.7760599" lon="-122.39436" stopId="15240"/>
<stop tag="5237" title="King St & 2nd St" lat="37.7796199" lon="-122.38982" stopId="15237"/>
<stop tag="7145" title="The Embarcadero & Brannan St" lat="37.7846299" lon="-122.38798" stopId="17145"/>
<stop tag="4510" title="Embarcadero Folsom St" lat="37.7907499" lon="-122.3898399" stopId="14510"/>
<stop tag="5629" title="Tunnel Entry Point Inbound Nea" lat="37.79279" lon="-122.39126" stopId="15629"/>
依旧等等
我想将每个停止标记中的每个属性存储到一个数组中,但我完全不知道我是如何开始的。
谢谢
更新: 我想我可以在第一个msdn链接上工作,但这只能得到第一行:
using (XmlReader reader = XmlReader.Create(new StringReader(feed)))
{
reader.ReadToFollowing("stop");
reader.MoveToFirstAttribute();
string tag = reader.Value;
reader.MoveToNextAttribute();
string title = reader.Value;
reader.MoveToNextAttribute();
string lat = reader.Value;
reader.MoveToNextAttribute();
string lon = reader.Value;
}
我如何使用上面的代码遍历每个站点?
由于
编辑:#2
此循环有效,但会一直显示停止属性的第一行:
using (XmlReader reader = XmlReader.Create(new StringReader(feed)))
{
reader.ReadToFollowing("stop");
while (reader.MoveToNextAttribute())
{
// Move the reader back to the element node.
//reader.ReadToFollowing("stop");
reader.MoveToFirstAttribute();
string tag = reader.Value;
MessageBox.Show(tag);
reader.MoveToNextAttribute();
string title = reader.Value;
MessageBox.Show(title);
reader.MoveToNextAttribute();
string lat = reader.Value;
MessageBox.Show(lat);
reader.MoveToNextAttribute();
string lon = reader.Value;
MessageBox.Show(lon);
}
reader.MoveToElement();
}
我觉得我很接近搞清楚。
答案 0 :(得分:1)
在Linq的帮助下,这是一个完整的解决方案。只需查看result
包含的内容
using (WebClient w = new WebClient())
{
string xml = w.DownloadString("http://webservices.nextbus.com/service/publicXMLFeed?command=routeConfig&a=sf-muni&r=N");
XDocument xDoc = XDocument.Parse(xml);
var result = xDoc.Descendants("stop")
.Select(n => new
{
Tag = (string)n.Attribute("tag"),
Title = (string)n.Attribute("title"),
Lat = (string)n.Attribute("lat"),
Lon = (string)n.Attribute("lon"),
StopId = (string)n.Attribute("stopId")
})
.ToArray();
}
答案 1 :(得分:0)
解析XML文件的方法有很多种。这是一个简单的方法:
XDocument doc = XDocument.Load(feedString);
var stops = doc.Document.Descendants(XName.Get("route"));
// Loop over all stops in the XML
foreach (var stop in stops)
{
}
我不确定你的意思是“将每个停止标记中的每个属性存储到一个数组中”,但我会定义一个类型:
class RouteStop
{ // make setters private and init them in ctor to make it immutable
public string Tag {get; set;} //maybe int ?
public string Title {get; set;}
public double Latitude {get; set;}
public double Longitude {get; set;}
public int ID {get; set;}
}
然后定义RouteStop列表
List<RouteStop> routeStops = new List<RouteStop>();
,只需在foreach循环中的create对象中
foreach (var stop in stops)
{
var tag = stop.Attribute("tag").Value;
var title = stop.Attribute("title").Value;
var long = double.Parse(stop.Attribute("lon").Value,
CultureInfo.InvariantCulture);
//etc
routeStops.add(new RouteStop() { Tag = tag } //and so on
}
答案 2 :(得分:0)
您可以使用以下内容:
XmlReader xmlReader = XmlReader.Create("http://webservices.nextbus.com/service/publicXMLFeed? command=routeConfig&a=sf-muni&r=N");
List<string> aTitle= new List<string>();
// Add as many as attributes you have in your "stop" element
while (xmlReader.Read())
{
//keep reading until we see your element
if (xmlReader.Name.Equals("stop") && (xmlReader.NodeType == XmlNodeType.Element))
{
string title = xmlReader.GetAttribute("title");
aTitle.Add(title);
// Add code for all other attribute you would want to store in list.
}
}
最后调用列表并根据索引获取所有项目。