XPathNodeIterator上时间循环的问题

Question

我正在尝试在XPathNodeIterator对象上执行while循环

     XPathNodeIterator xpCategories = GetCategories().Current.Select("/root/category/id");    

现在，xpCategories持有这样一个xml

 <root>
  <category numberofproducts="0">
    <id>format</id>
    <name>Kopi/Print</name>
  </category>
  <category numberofproducts="1">
    <id>frankering</id>
    <name>Kopi/Print</name>
  </category>
  <category numberofproducts="0">
    <id>gardbøjler</id>
    <name>Møbler</name>
  </category>
  <category numberofproducts="0">
    <id>gardknager</id>
    <name>Møbler</name>
  </category>
  <category numberofproducts="0">
    <id>gardspejle</id>
    <name>Møbler</name>
  </category>

</root>

我需要在loop.tried中获取每个类别节点"id“，如下所示

XPathNodeIterator xpCategories = GetCategories().Current.Select("/root/category/id");    
while (xpCategories.MoveNext())
Console.WriteLine(xpCategories.Current.Value);

但是这个循环在那之后只工作了一次，我不明白出了什么问题？

Answer 1

它应该是

while (xpCategories.MoveNext())
{
    XPathNavigator n = xpCategories.Current;
    Console.WriteLine(n.Value);
}

或

foreach (XPathNavigator n in xpCategories)Console.WriteLine(n.Value);

虽然我推荐LINQ2XML

XDocument doc=XDocument.Load(xmlPath);
List<string> ids=doc.Elements("category")
                    .Select(x=>x.Element("id").Value)
                    .ToList();