c# - XPathNodeIterator 从迭代数据访问子节点

Question

<?xml version="1.0"?>

-<bookstore>            
        <book > 
            <title>aaaa</title> 
            -<author > 
                <first-name>firts</first-name> 
                <last-name>last</last-name> 
            </author> 
            <price>8.23</price> 
            <otherbooks>
                    <book > 
                        <title>bbb</title>      
                        <price>18.23</price> 
                    </book>     
                    <book > 
                        <title>ccc</title>      
                        <price>11.22</price> 
                    </book>     
            </otherbooks>
        </book> 
</bookstore>

我已经从 xml 文件中选择了所有书籍。如何使用 XPath 选择每本书的标题、作者(名字和姓氏)和价格？

xPathDoc = new XPathDocument(filePath);
xPathNavigator = xPathDoc.CreateNavigator();
XPathNodeIterator xPathIterator = xPathNavigator.Select("/bookstore//book");
foreach (XPathNavigator book in xPathIterator)
{
    ??
}

Answer 1

使用SelectSingleNode() 和Value:

  XPathDocument xPathDoc = new XPathDocument(filePath); 
  XPathNavigator xPathNavigator = xPathDoc.CreateNavigator(); 
  XPathNodeIterator xPathIterator = xPathNavigator.Select("/bookstore//book"); 
  foreach (XPathNavigator book in xPathIterator) 
  {
    XPathNavigator nav = book.SelectSingleNode("title");
    string title = nav==null ? string.Empty : nav.Value;
    nav = book.SelectSingleNode("author/first-name");
    string authorFirstName = nav==null ? string.Empty : nav.Value;
    nav = book.SelectSingleNode("author/last-name");
    string authorLastName = nav==null ? string.Empty : nav.Value;
    nav = book.SelectSingleNode("price");
    string price = nav==null ? string.Empty : nav.Value;;
    Console.WriteLine("{0} {1} {2} {3}", title, authorFirstName, authorLastName, price);
  }