在XmlReader C#中跳过子项

Question

我有以下XML

<Company name="Kinanah Computers">
  <Computer Name="Computer" type="Dell">
      <Accessory type="screen" model="dell"/>
      <Accessory type="mouse" model="dell"/>
      <Accessory type="keyboard" model="dell"/>
  </Computer>
  <Computer Name="Computer" type="HP">
        <Accessory type="screen" model="hp"/>
        <Accessory type="mouse" model="chinese"/>
        <Accessory type="keyboard" model="dell"/>
  </Computer>
  <Computer Name="Computer" type="HP">
        <Accessory type="screen" model="hp"/>
        <Accessory type="mouse" model="chinese"/>
        <Accessory type="keyboard" model="dell"/>
  </Computer>
  <Computer Name="Computer" type="acer">
        <Accessory type="screen" model="acer"/>
        <Accessory type="mouse" model="acer"/>
        <Accessory type="keyboard" model="acer"/>
  </Computer>
</Company>

我想做的是跳过惠普电脑，如果它的类型是惠普，谁能告诉我怎么做吗？

我使用了以下C#代码：

var stream = new StringReader(instanceXml/*the xml above*/);
var reader = XmlReader.Create(stream);
var hpCount = 0;
reader.MoveToContent();

while (reader.Read())
{
  if(reader.NodeType == XmlNodeType.Element)
  {
     if(reader.GetAttribute("Name") == "Computer" && reader.GetAttribute("type") == "HP")
     {
        if(hpCount >1)
        {
           reader.Skip();
          continue;
        }
        hpCount++;
     }
  }
}

但是跳过不起作用，下一个被读取的元素是

<Accessory type="screen" model="hp"/>

如何跳过这些行有什么帮助吗？谢谢。

Answer 1

您可以使用Linq轻松解析您的xml：

XDocument xdoc = XDocument.Parse(instanceXml);
var query = from c in xdoc.Descendatns("Computer")
            where (string)c.Attribute("type") != "HP"
            select new {
               Name = (string)c.Attribute("Name"),
               Type = (string)c.Attribute("type"),
               Accessories = from a in c.Elements()
                             select new {
                                Type = (string)a.Attribute("type"),
                                Model = (string)a.Attribute("model")
                             }
            };

这将为您提供强类型匿名对象的集合，用嵌套附件集合表示计算机数据。

Answer 2

实际上这不会有什么帮助，因为我将根据计数进行过滤，对不起，我已经更新了上面的代码，你能重新检查一下吗？

List<XElement> query = from c in xdoc.Decendants("Computer") // from <Computer> tag or lower
where (string)c.Attribute("type") == "HP" // where <Computer> attribute name is "type" and "type" equals string value "HP"
select c; // return List of matching `<Computer>` XElements

int HpComputers = query.count; // You want to filter by amount of HP computers?

像这样按计数过滤吗？

Answer 3

不检查hpCount > 1，而是检查hpCount > 0

if(hpCount >1)
{
  reader.Skip();
  continue;
 }