C#中linq学习（将泛型集合转换为XML元素）示例

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Xml.Linq;

namespace LinqStudy

{

//***********************************************************************************************************

//Module:Program.cs

//Author:limeteor

//Create Date:2008-06-27

//***********************************************************************************************************

class Program

{

static void Main(string[] args)

{

List<Student> students = new List<Student>() {

new Student{First="Svetlana",Last="Omelchenko",ID=111,Street="123 Main Street",City="Seattle",Scores=new List<int>(){97, 92, 81, 60}},

new Student{First="Claire",Last="O’Donnell",ID=112,Street="124 Main Street",City="Redmond",Scores=new List<int>(){75, 84, 91, 39}},

new Student{First="Sven",Last="Mortensen",ID=113,Street="125 Main Street",City="Lake City",Scores= new List<int> {88, 94, 65, 91}},

};

List<Teacher> teachers = new List<Teacher>(){

new Teacher {First="Ann", Last="Beebe", ID=945, City = "Seattle"},

new Teacher {First="Alex", Last="Robinson", ID=956, City = "Redmond"},

new Teacher {First="Michiyo", Last="Sato", ID=972, City = "Tacoma"}

};

//用查询语法生成xml格式

var studentXML = new XElement("Root", from student in students

let x = String.Format("{0},{1},{2},{3}", student.Scores[0], student.Scores[1], student.Scores[2], student.Scores[3])

select new XElement("student",

new XElement("First", student.First),

new XElement("Last", student.Last),

new XElement("Scores", x)));

//用Lambda表达式（方法语法）生成xml格式

var teacherXML = new XElement("Root",teachers.Select(p=> new XElement("Teacher",new XElement("First",p.First),

new XElement("Last",p.Last),

new XElement("Id",p.ID),

new XElement("City",p.City))));

Console.WriteLine("---------开始打印----------------------");

Console.WriteLine(studentXML);

Console.WriteLine("----------------------------------------");

Console.WriteLine(teacherXML);

Console.WriteLine("----------------------------------------");

foreach (var i in teacherXML.Nodes())

{

Console.WriteLine(i);//打印第一个节点子节点的集合

}

Console.WriteLine("--------------打印完成------------------");

Console.ReadKey();

}

}

//***********************************************************************************************************

//Module:Student.cs

//Author:limeteor

//Create Date:2008-06-27

//***********************************************************************************************************

class Student

{

public string First { get; set; }

public string Last { get; set; }

public int ID { get; set; }

public string Street { get; set; }

public string City { get; set; }

public List<int> Scores;

}

//***********************************************************************************************************

//Module:Teacher.cs

//Author:limeteor

//Create Date:2008-06-27

//***********************************************************************************************************

class Teacher

{

public string First { get; set; }

public string Last { get; set; }

public int ID { get; set; }

public string City { get; set; }

}

}