using#region using using System; using System.Data; using System.Configuration; using System.Linq; using System.Web; using System.Web.Security; using System.Web.UI; using System.Text; using System.Web.UI.WebControls; using System.Web.UI.WebControls.WebParts; using System.Web.UI.HtmlControls; using System.Collections.Generic; using System.Collections; #endregion public partial class _Default : System.Web.UI.Page { protectedvoid Page_Load(object sender, EventArgs e) { 根据条件查询数组#region 根据条件查询数组 Response.Write("<hr>列出数组中字符长度大于等于6的字符串数组:<br>"); string[] Demo1 ={ "Ajax", "Csharp", "Javascript", "Css Desige", "Asp.net", "Gis" }; var books = from n in Demo1 where n.Length >=6 select n; foreach (var book in books){ Response.Write(string.Format("<span class='result'>{0}</span>", book)); } #endregion where查询的Lambda表达式#region where查询的Lambda表达式 Response.Write("<hr>where查询的快捷方法:<br>"); var books2 = Demo1.Where(book => book.Length >=6); foreach (var book in books2) { Response.Write(string.Format("<span class='result'>{0}</span>", book)); } #endregion 根据条件查询集合体#region 根据条件查询集合体 Response.Write("<hr>列出集合中语言为Chinese的学生:<br>"); List<Student> Demo2 = GetStudents(); var students1 = from n in Demo2 where n.Language =="Chinese" select n.Name; foreach (var student in students1){ Response.Write(string.Format("<span class='result'>{0}</span>", student)); } #endregion 根据条件查询集合体#region 根据条件查询集合体 Response.Write("<hr>列出集合中年龄大于等于20的英国或苏格兰学生:<br>"); var students2 = from n in Demo2 where (n.Language =="English"|| n.Language =="Scotland") && n.Age >=20 select n; foreach (var student in students2){ Response.Write(string.Format("<span class='result'>{0}</span>", student.Name)); } #endregion } 构造一个学生集合体#region 构造一个学生集合体 private List<Student> GetStudents() { List<Student> students =new List<Student>{ new Student{ Name="YOUNG", Age=25, Language="Chinese"}, new Student{ Name="JESSIE", Age=21, Language="Scotland"}, new Student{ Name="KELLY", Age=18, Language="English"}, new Student{ Name="JUNE", Age=20, Language="English"}, new Student{ Name="ADRIAN", Age=22, Language="Italy"}, new Student{ Name="BRUCE", Age=17, Language="Scotland"}, new Student{ Name="BRANT", Age=30, Language="Germany"}, new Student{ Name="BEN", Age=25, Language="Chinese"} }; return students; } #endregion } 学生类#region 学生类 class Student { publicint Age { get; set; } publicstring Name { get; set; } publicstring Language { get; set; } } #endregion