Silverlight Windows phone 7使用XDocument读取XML
嗨,我正在尝试制作我的第一个windows phone 7应用程序。它涉及到向服务器查询航班信息。然后接收一个XML文档。然后,我想基于我得到的XML创建一系列对象。但是,存在一个问题,因为对象值为空 我的代码Silverlight Windows phone 7使用XDocument读取XML,silverlight,windows-phone-7,Silverlight,Windows Phone 7,嗨,我正在尝试制作我的第一个windows phone 7应用程序。它涉及到向服务器查询航班信息。然后接收一个XML文档。然后,我想基于我得到的XML创建一系列对象。但是,存在一个问题,因为对象值为空 我的代码 private void SearchButton_Click(object sender, RoutedEventArgs e) { getResults("http://test.com/"); } public void ge
private void SearchButton_Click(object sender, RoutedEventArgs e)
{
getResults("http://test.com/");
}
public void getResults(string websiteURL)
{
WebClient c = new WebClient();
c.DownloadStringAsync(new Uri(websiteURL));
c.DownloadStringCompleted += new DownloadStringCompletedEventHandler(c_DownloadStringCompleted);
}
void c_DownloadStringCompleted(object sender, DownloadStringCompletedEventArgs e)
{
lock (this)
{
string s = e.Result;
XmlReader r = XmlReader.Create(new MemoryStream(System.Text.UnicodeEncoding.Unicode.GetBytes(s)));
// So something with the XML we get back
XDocument data = XDocument.Load(r);
var ns = data.Root.GetDefaultNamespace();
var flights = from query in data.Descendants(ns+"Flight")
select new Flight
{
AircraftType = (int)query.Element(ns + "AircraftType"),
ArrivalTerminal = (int)query.Element(ns + "ArrivalTerminal"),
Carrier = (string)query.Element(ns + "Carrier"),
DepartureTerminal = (int)query.Element(ns + "DepartureTerminal"),
Duration = (string)query.Element(ns + "Duration"),
EndDateTime = (string)query.Element(ns + "EndDateTime"),
EndPoint = (string)query.Element(ns + "EndPoint"),
FlightIndexNo = (int)query.Element(ns + "FlightIndexNo"),
FlightNo = (int)query.Element(ns + "FlightNo"),
NumStops = (int)query.Element(ns + "NumStops"),
OperatedBy = (string)query.Element(ns + "OperatedBy"),
StartDateTime = (string)query.Element(ns + "StartDateTime"),
StartPoint = (string)query.Element(ns + "StartPoint")
};
//checking if anything is there.
string result ="";
foreach (Flight i in flights)
{
result += i.Carrier;
}
resultsBlock.Text = result;
}
}
public class Flight
{
public int aircraftType;
public int arrivalTerminal;
public string carrier;
public int departureTerminal;
public string duration;
public string endDateTime;
public string endPoint;
public int flightIndexNo;
public int flightNo;
public int numStops;
public string operatedBy;
public string startDateTime;
public string startPoint;
//Getter and setters
我想要的XML部分如下所示。这也是在XML中首次使用Flight标记。添加了XML的开头,整个过程有数百行,所以不会,但会全部结束。我要的航班标签就在那里
<FindFlightsResponse xmlns="urn:webjet.com.au" xmlns:i="http://www.w3.org/2001/XMLSchema-instance">
<DisplayMessage i:nil="true" />
<OutboundFlightInfo>
...
<Flight>
<AircraftType>734</AircraftType>
<ArrivalTerminal>3</ArrivalTerminal>
<Carrier>QF</Carrier>
<DepartureTerminal>1</DepartureTerminal>
<Duration>PT1H25M</Duration>
<EndDateTime>2011-04-20T07:25:00</EndDateTime>
<EndPoint>SYD</EndPoint>
<FlightIndexNo>1</FlightIndexNo>
<FlightNo>400</FlightNo>
<NumStops>0</NumStops>
<OperatedBy>QF</OperatedBy>
<StartDateTime>2011-04-20T06:00:00</StartDateTime>
<StartPoint>MEL</StartPoint>
</Flight>
我可能犯了一些简单的错误。
谢谢你的帮助。
谢谢
编辑im现在得到一个方法传递错误。为了简单起见,我将datetime改为string我猜您没有向我们展示完整的XML,它可能指定了默认名称空间。名称空间将类似于xmlns=http://www.domain.com. 如果确实是这种情况,那么LINQ到XML查询需要引用该名称空间,可以按如下方式完成:
var ns = data.Root.GetDefaultNamespace();
var flights = from query in data.Descendants(ns + "Flight")
select new Flight
{
AircraftType = (int)query.Element(ns + "AircraftType"),
ArrivalTerminal = (int)query.Element(ns + "ArrivalTerminal"),
Carrier = (string)query.Element(ns + "Carrier"),
DepartureTerminal = (int)query.Element(ns + "DepartureTerminal"),
Duration = (string)query.Element(ns + "Duration"),
EndDateTime = (DateTime)query.Element(ns + "EndDateTime"),
EndPoint = (string)query.Element(ns + "EndPoint"),
FlightIndexNo = (int)query.Element(ns + "FlightIndexNo"),
FlightNo = (int)query.Element(ns + "FlightNo"),
NumStops = (int)query.Element(ns + "NumStops"),
OperatedBy = (string)query.Element(ns + "OperatedBy"),
StartDateTime = (DateTime)query.Element(ns + "StartDateTime"),
StartPoint = (string)query.Element(ns + "StartPoint")
};
请注意,您需要在每个元素名称前面加上名称空间,因此在整个代码中使用ns+。谢谢Ahmad,您说得对,指定了名称空间。然而,我做了改变,仍然有相同的problem@user704314您能用所做的更改更新您的问题并用名称空间显示更多的XML吗?为了简单起见,我已经更新了代码并更改了datetime参数,因为现在我收到一个错误,说在创建新航班时FormatException未经处理。@user704314可能是其他原因导致了异常,可能是在飞行类中,或者是在使用它的线路上。为了验证,我建议在查询之后放置一个断点并检查结果。如果它在到达断点之前失败,那么作为查询的一部分,很可能会出现一些问题。事实上,您可以注释掉Flight并临时使用匿名类型来验证查询是否按如下方式工作:选择new//Flight。通过从飞行中删除注释并检查代码,这些都应该起作用并揭示问题所在。