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代码如下,谢谢阅读,控制台应用程序:
using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.IO; using System.Xml.Linq;
namespace LinqQueryDemo { class Student { public string Name { get; set; } public bool Sex { get; set; } public int Age { get; set; } }
class Program { static void Main(string[] args) { Console.WriteLine("===============数组的Linq查询============="); //隐式类型化数组 var persons = new[]{ new {Name="王二" ,Sex=true,Age=17}, new {Name="张三", Sex=true,Age=15}, new {Name="李四", Sex=true,Age=21} }; /* * 执行简单Linq查询 * 检索所有年龄在25岁以内的人 * 查询结果放在results变量中 * results变量的类型与数组persons相同 */ var results = from p in persons where p.Age <= 25 select p; foreach (var person in results) { Console.WriteLine(person.Name); } Console.WriteLine("===============集合的Linq查询============="); //集合构造者new List<Student>(){ } //对象构造者new Student(){ } List<Student> students = new List<Student>(){ new Student(){ Name="张三", Sex=true, Age=25}, new Student(){ Name="李文平", Sex=true, Age=22}, new Student(){ Name="刘庆溪", Sex=true, Age=22} }; var stus = from p in students where p.Age <= 25 select p; foreach (var stu in stus) { Console.WriteLine(stu.Name); } /* 执行简单Linq查询XML * 检索所有年龄在25岁以内的学生信息 * 查询结果放在stuResults变量中 */ Console.WriteLine("===============XML的Linq查询============="); string xml = "<students><student><Name>王二</Name><Sex>true</Sex><Age>28</Age></student><student><Name>李四</Name><Sex>true</Sex><Age>22</Age></student><student><Name>张三</Name><Sex>true</Sex><Age>25</Age></student></students>"; using (StringReader reader = new StringReader(xml))//创建字符串读取器 { XDocument xDoc = XDocument.Load(reader);//装载xml var stuResults = from p in xDoc.Element("students").Elements("student") where Convert.ToInt32(p.Element("Age").Value) <= 25 select p; foreach (var stu in stuResults) { Console.WriteLine(stu.Element("Name").Value); } } } } }
尊重作者,转发请注明出处:http://www.cnblogs.com/minotmin 谢谢阅读,有错请指出,不甚感激。
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