#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
{
protected void Page_Load(object sender, EventArgs e)
{
用Count()得出查询结果的个数#region 用Count()得出查询结果的个数
Response.Write("<hr>用Count()得出查询结果的个数<br>");
var langCount = (from s in GetStudents()
select s.Language)
.Distinct()
.Count();
Response.Write(string.Format("<div class='result'>{0}</div>", langCount));
#endregion
用Count()的Lambda表达式满足条件的元素个数#region 用Count()的Lambda表达式满足条件的元素个数
Response.Write("<hr>用Count()得出查询结果的个数<br>");
var ageCoun = (from s in GetStudents()
select s.Age)
.Count(a=>a>22);
Response.Write(string.Format("<div class='result'>{0}</div>", ageCoun));
#endregion
用Sum()将查询结果相加#region 用Sum()将查询结果相加
Response.Write("<hr>用Sum()将查询结果相加<br>");
var ageSum = (from s in GetStudents()
select s.Age)
.Sum();
//var ageSum = GetStudents().Sum(s=>s.Age);
Response.Write(string.Format("<div class='result'>{0}</div>", ageSum));
#endregion
用Min()得出查询结果的最小值#region 用Min()得出查询结果的最小值
Response.Write("<hr>用Min()得出查询结果的最小值<br>");
var ageMin = (from s in GetStudents()
select s.Age)
.Min();
//var ageMin = GetStudents().Min(s => s.Age);
Response.Write(string.Format("<div class='result'>{0}</div>", ageMin));
#endregion
用Max()得出查询结果的最大值#region 用Max()得出查询结果的最大值
Response.Write("<hr>用Max()得出查询结果的最大值<br>");
var ageMax = (from s in GetStudents()
select s.Age)
.Max();
//var ageMax = GetStudents().Max(s => s.Age);
Response.Write(string.Format("<div class='result'>{0}</div>", ageMax));
#endregion
用Average()得出查询结果的平均值#region 用Average()得出查询结果的平均值
Response.Write("<hr>用Average()得出查询结果的平均值<br>");
var ageAverage = (from s in GetStudents()
select s.Age)
.Average();
//var ageAverage = GetStudents().Average(s => s.Age);
Response.Write(string.Format("<div class='result'>{0}</div>", ageAverage));
#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
{
public int Age { get; set; }
public string Name { get; set; }
public string Language { get; set; }
}
#endregion
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