使用 XPath 从 XML 中提取所需数据时遇到问题。我正在连接到 Web 服务并以 XML 格式获取响应。然后我使用 XPath 将数据加载到 XmlNode 中。我在这段代码中使用 C#。我面临的问题是我无法从 XML 响应中读取任何节点和与之关联的数据。XmlNode 中的值始终为空。理想情况下,我想提取特定节点的数据。
这是我在 C# 代码中读取响应和存储节点值的操作。
String webURL3;
WebRequest YRCRateQuote;
WebResponse resp3;
Stream respStream3;
XmlDocument rateQuote3 = new XmlDocument();
XmlNode freightCharge3;
XmlNode serviceDays3;
//build web request
webURL3 = String.Format(webstring);
//create web request
YRCRateQuote = WebRequest.Create(webURL3);
//make web service call
resp3 = YRCRateQuote.GetResponse();
//read response
respStream3 = resp3.GetResponseStream();
rateQuote3.Load(respStream3);
//use xpath to pull reqd data
freightCharge3 = rateQuote3.SelectSingleNode("//TOTAL_COST");
serviceDays3 = rateQuote3.SelectSingleNode("//SERVICEDAYS");
//I also tried this
freightCharge3 = rateQuote3.SelectSingleNode("//TOTAL_COST[DELIVERYTIME='Multi-hour Window']");
这是我从 Web 服务获得的 XML 响应。
<?xml version="1.0"?>
<RateQuoteResponse xmlns="http://ratequote.usfnet.usfc.com/v2/x1">
<STATUS>
<CODE>0</CODE>
<VIEW>SECURED</VIEW>
<VERSION>
<CURRENT>V2X1</CURRENT>
<CURRENT_RELEASE_DATE>02/06/2010</CURRENT_RELEASE_DATE>
<LATEST>V2X1</LATEST><LATEST_RELEASE_DATE>02/06/2010</LATEST_RELEASE_DATE>
</VERSION></STATUS>
<RateQuote>
<ORIGIN>
<NAME>INDIANAPOLIS</NAME>
<CARRIER>USF Holland, Inc</CARRIER>
<ADDRESS>2530 S TIBBS AVE</ADDRESS>
<CITY>INDIANAPOLIS</CITY>
<STATE>IN</STATE>
<ZIP>46241</ZIP>
<PHONE>3172277627</PHONE>
<PHONE_TOLLFREE>8006274831</PHONE_TOLLFREE>
<FAX>3172277629</FAX>
</ORIGIN>
<DESTINATION>
<NAME>INDIANAPOLIS</NAME>
<CARRIER>USF Holland, Inc</CARRIER>
<ADDRESS>2530 S TIBBS AVE</ADDRESS>
<CITY>INDIANAPOLIS</CITY>
<STATE>IN</STATE>
<ZIP>46241</ZIP>
<PHONE>3172277627</PHONE>
<PHONE_TOLLFREE>8006274831</PHONE_TOLLFREE>
<FAX>3172277629</FAX>
</DESTINATION>
<ORIGIN_ZIP>46202</ORIGIN_ZIP>
<DESTINATION_ZIP>46204</DESTINATION_ZIP>
<TOTAL_COST>117.02</TOTAL_COST>
<DISCOUNTPERCENTAGE>85.0</DISCOUNTPERCENTAGE>
<DISCOUNTAMOUNT>512.04</DISCOUNTAMOUNT>
<SERVICEDAYS>1</SERVICEDAYS>
<INDUSTRYDAYS>1.5</INDUSTRYDAYS>
<CLASSWEIGHT>
<CLASS>60</CLASS>
<ASCLASS>60</ASCLASS>
<WEIGHT>1500</WEIGHT>
<CHARGES>602.4</CHARGES>
</CLASSWEIGHT>
<ADDIONALCHARGES>
<RATE>Fuel Surcharge</RATE>
<CHARGES>26.66</CHARGES>
<DESCRIPTION>FSC29.50% ON DIESEL OF 386.7</DESCRIPTION>
</ADDIONALCHARGES>
<SERVICEUPGRADES>
<DELIVERYDAYS>Please Call Customer Service for Available Days and Times</DELIVERYDAYS>
<DELIVERYTIME>Single-hour Window</DELIVERYTIME>
<SERVICE_TYPE>guaranteed window</SERVICE_TYPE>
<TOTAL_COST>267.02</TOTAL_COST>
</SERVICEUPGRADES>
<SERVICEUPGRADES>
<DELIVERYDAYS>Please Call Customer Service for Available Days and Times</DELIVERYDAYS>
<DELIVERYTIME>Multi-hour Window</DELIVERYTIME>
<SERVICE_TYPE>guaranteed window</SERVICE_TYPE>
<TOTAL_COST>267.02</TOTAL_COST>
</SERVICEUPGRADES>
<SERVICEUPGRADES>
<DELIVERYDAYS>Please Call Customer Service for Available Days and Times</DELIVERYDAYS>
<DELIVERYTIME>Single or Multi Day Window</DELIVERYTIME>
<SERVICE_TYPE>guaranteed window</SERVICE_TYPE>
<TOTAL_COST>152.02</TOTAL_COST>
</SERVICEUPGRADES>
<SERVICEUPGRADES>
<DELIVERYDATE>07/17/2013</DELIVERYDATE>
<DELIVERYDAYS>1</DELIVERYDAYS>
<DELIVERYTIME>before 9:00 AM</DELIVERYTIME>
<SERVICE_TYPE>guaranteed delivery</SERVICE_TYPE>
<TOTAL_COST>217.02</TOTAL_COST>
</SERVICEUPGRADES>
<SERVICEUPGRADES>
<DELIVERYDATE>07/17/2013</DELIVERYDATE>
<DELIVERYDAYS>1</DELIVERYDAYS>
<DELIVERYTIME>before 12:00 PM (noon)</DELIVERYTIME>
<SERVICE_TYPE>guaranteed delivery</SERVICE_TYPE>
<TOTAL_COST>182.02</TOTAL_COST>
</SERVICEUPGRADES>
<SERVICEUPGRADES>
<DELIVERYDATE>07/17/2013</DELIVERYDATE>
<DELIVERYDAYS>1</DELIVERYDAYS>
<DELIVERYTIME>before 3:30 PM</DELIVERYTIME>
<SERVICE_TYPE>guaranteed delivery</SERVICE_TYPE>
<TOTAL_COST>152.02</TOTAL_COST>
</SERVICEUPGRADES>
<SERVICEUPGRADES>
<DELIVERYDATE>07/17/2013</DELIVERYDATE>
<DELIVERYDAYS>1</DELIVERYDAYS>
<SERVICE_TYPE>regional delivery</SERVICE_TYPE>
<TOTAL_COST>117.02</TOTAL_COST>
</SERVICEUPGRADES>
</RateQuote>
</RateQuoteResponse>