用XML代码扩展C＃代码

Question

我从链接“http://www.codeproject.com/Tips/146237/Reading-XML-documents-using-LINQ”得到了一些启示。

如果我需要检索的Subject1和Subject2数据，应该如何在新的C＃是通过更换这个代码listBox1.Items.Add(b.Element("Subject").Value.Trim());

C＃：

var books = from nodes in System.Xml.Linq.XElement.Load("Books.xml").Elements("Book") select nodes; 

if (books != null) 
{ 
    foreach (var b in books) 
    { 
     listBox1.Items.Add(b.Element("Subject").Value.Trim()); 

    } 
} 

XML：

<?xml version="1.0" encoding="utf-8" ?> 
<Books> 
    <Book> 
    <Subject> 
    <Subject1>Subject1a</Subject1> 
    <Subject2>Subject1a</Subject2> 
    </Subject> 
    <Content> 
     History,Geography 
    </Content> 
    </Book> 

    <Book> 
    <Subject> 
    <Subject1>Subject2b</Subject1> 
    <Subject2>Subject2b</Subject2> 
    </Subject> 
    <Content> 
     Biology,Chemistry,Physics 
    </Content> 
    </Book> 
</Books> 

Answer 1

我我不确定我是否正确理解你，

foreach (var b in books) { 
    var s = b.Element("Subject"); 
    listBox1.Items.Add(s.Element("Subject1").Value.Trim()); 
    listBox1.Items.Add(s.Element("Subject1").Value.Trim()); 
} 

Answer 2

var items = (from node in System.Xml.Linq.XElement.Parse(xml).Elements("Book") 
        let subject = node.Element("Subject") 
        select new 
        { 
         Subject1 = subject.Element("Subject1"), 
         Subject2 = subject.Element("Subject2") 

        }).ToList();