linq to xml只选择具有特定元素的节点

Question

使用以下xml我只想返回<category domain="Portal Sub" value="Events">节点中存在子元素的项目。

我试着用下面的代码，但它仍然返回所有节点。 任何帮助将不胜感激，因为我似乎无法弄清楚如何获得只有子节点存在的项目。

<item guid="123"> 
    <title>test1</title> 
     <category domain="Target">Business Decision Makers</category> 
     <category domain="Target">Individual Customers</category> 
     <category domain="Target">IT Decision Makers</category> 
     <category domain="Portal" value="IT Network"> 
      <category domain="Portal Sub" value="Events"> 
       <category domain="Portal Sub" value="Forum" /> 
      </category> 
     </category> 
    </item> 
    <item guid="456"> 
    <title>test2</title> 
     <category domain="Target">IT managers</category> 
     <category domain="Target">IT Professional</category> 
     <category domain="Portal" value="IT Network"> 
      <category domain="Portal Sub" value="Events" /> 
     </category> 
    </item> 





var getFilteredItems = (from item in xdoc.Descendants("item") 
          where item.Descendants("category").Descendants("category").Any() 
          select new 
          { 
            etype = (from x in item.Elements("category").Elements("category") 
              where x.Attribute("value").Value == "Events" 
              select new 
              { 
               cctype = x.Descendants("category").Select(i => i.Attribute("value").Value ?? "") 
              }).First() 

          }).ToList(); 

Answer 1

from item in xdoc.Descendants("item") 
where item.Descendants("category").Any(c => (string)c.Attribute("domain") == "Portal" 
    && (string)c.Attribute("value") == "Events" && c.Elements().Any()) 
select ...