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XmlDocument xmlDoc = new XmlDocument();
xmlDoc.LoadXml(@"<Root>
<DiscountInfo>
<Number>1</Number>
<FlightNO>ZH9683</FlightNO>
<Class>Z</Class>
<Discount>55</Discount>
<Nums>A</Nums>
<Price>380</Price>
<ClassType>常规</ClassType>
<PolicyID />
<IsPAT>0</IsPAT>
<PATCmd />
<Area />
<IsChild>0</IsChild>
</DiscountInfo>
<DiscountInfo>
<Number>1</Number>
<FlightNO>ZH9683</FlightNO>
<Class>G</Class>
<Discount>51</Discount>
<Nums>A</Nums>
<Price>350</Price>
<ClassType>常规</ClassType>
<PolicyID />
<IsPAT>0</IsPAT>
<PATCmd />
<Area />
<IsChild>0</IsChild>
</DiscountInfo>
<DiscountInfo>
<Number>2</Number>
<FlightNO>ZH9683</FlightNO>
<Class>V</Class>
<Discount>45</Discount>
<Nums>A</Nums>
<Price>310</Price>
<ClassType>常规</ClassType>
<PolicyID />
<IsPAT>0</IsPAT>
<PATCmd />
<Area />
<IsChild>0</IsChild>
</DiscountInfo>
</Root>");
XmlNodeList nodes = xmlDoc.SelectNodes("//DiscountInfo[./Number = '1']");
foreach (XmlNode node in nodes)
{
MessageBox.Show(node.InnerXml);
}