视频演示：http://u.115.com/file/f24db1fdfa

通过 LINQ 查询，可以轻松地在内存中的数据结构、sql 数据库、ADO.NET 数据集和 XML 流或文档之间转换数据。下面的示例将内存中的数据结构中的对象转换为 XML 元素。

List<Student> Students = new List<Student>()
{
    new Student {
        FirstName="Svetlana",LastName="Omelchenko",ID=111,scores = new List<int>{97,92,81,60}},new Student {
        FirstName="Claire",LastName="O’Donnell",ID=112,scores = new List<int>{75,84,91,39}},new Student {
        FirstName="Sven",LastName="Mortensen",ID=113,scores = new List<int>{88,94,65,91}},};

// Create the query.
var StudentsToXML = new XElement("Root",from student in Students
    let scoreString = String.Format("{0},{1},{2},{3}",student.scores[0],student.scores[1],student.scores[2],student.scores[3])
    select new XElement("Student",new XElement("FirstName",student.FirstName),new XElement("LastName",student.LastName),new XElement("scores",scoreString)
            ) 
        );

// Execute the query.
Console.WriteLine(StudentsToXML);

// Keep the console open in debug mode.
Console.WriteLine("Press any key to exit.");
Console.ReadKey();

此代码生成下面的 XML 输出：

<Root>
  <Student>
    <FirstName>Svetlana</FirstName>
    <LastName>Omelchenko</LastName>
    <scores>97,60</scores>
  </Student>
  <Student>
    <FirstName>Claire</FirstName>
    <LastName>O’Donnell</LastName>
    <scores>75,39</scores>
  </Student>
  <Student>
    <FirstName>Sven</FirstName>
    <LastName>Mortensen</LastName>
    <scores>88,91</scores>
  </Student>
</Root>