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来源： [C#/ASP.NET]List中Sort()、Find()、FindAll()、Exist()的使用方法 – zock – 博客园
[C#/ASP.NET]中List<T>真的非常好用。一个例子简单说明一下List<>中Sort()、Find()、FindAll()、Exist()的使用方法
简单介绍：
List<T>.Sort() → 排序T
List<T>.Find() → 找出一個T
List<T>.FindAll() →找出多個T
List<T>.Exist() →判斷T是否存在
示例代码：
页面文件GenericList.aspx
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<%@ Page Language="C#" AutoEventWireup="true" CodeFile="GenericList.aspx.cs" Inherits="GenericList" %><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head runat="server"> <title>GenericList</title></head><body> <form id="form1" runat="server"> <div> 原始資料： <asp:GridView ID="GridView1" runat="server"> </asp:GridView> </div> </form></body></html> |
后台代码文件GenericList.aspx.cs
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using System;using System.Collections.Generic;using System.Web;using System.Web.UI;using System.Web.UI.WebControls;public partial class GenericList : System.Web.UI.Page{ protected void Page_Load(object sender, EventArgs e) { List<Person> lstPerson = new List<Person>(); lstPerson.Add(new Person(1, "puma", 10)); lstPerson.Add(new Person(2, "F6 Team", 20)); lstPerson.Add(new Person(4, "Dotblogs", 40)); //原始資料顯示在GridView上 this.GridView1.DataSource = lstPerson; this.GridView1.DataBind(); //List<T>.Find() //找出Name='puma'的Person Response.Write("找出Name='puma'的Person→ "); Response.Write(lstPerson.Find(delegate(Person p) { return p.Name == "puma"; }).ToString() + "<p>"); //List<T>.FindAll() //找出Age>10的數目 Response.Write("找出Age>10的數目→ "); Response.Write(lstPerson.FindAll(delegate(Person p) { return p.Age > 10; }).Count.ToString() + "<p>"); //List<T>.Exists() //檢查Name='F6'是否存在 Response.Write("檢查Name='F6'是否存在→ "); Response.Write(lstPerson.Exists(delegate(Person p) { return p.Name == "F6"; }).ToString() + "<p>"); //List<T>.Sort() //依Name升冪排序 Response.Write("<p>依Name升冪排序↑<br/>"); lstPerson.Sort(delegate(Person p1, Person p2) { return Comparer<string>.Default.Compare(p1.Name, p2.Name); }); foreach (Person p in lstPerson) { Response.Write(p.ToString() + "<br/>"); } //List<T>.Sort() //依Name降冪排序 Response.Write("<p>依Name降冪排序↓<br/>"); lstPerson.Sort(delegate(Person p1, Person p2) { return Comparer<string>.Default.Compare(p2.Name, p1.Name); }); foreach (Person p in lstPerson) { Response.Write(p.ToString() + "<br/>"); } }}public class Person{ private int _ID; private string _Name; private int _Age; public Person(int ID, string Name, int Age) { _ID = ID; _Name = Name; _Age = Age; } public int ID { set { _ID = value; } get { return _ID; } } public string Name { set { _Name = value; } get { return _Name; } } public int Age { set { _Age = value; } get { return _Age; } } public override string ToString() { return string.Format("ID：{0}，Name：{1}，Age：{2}", _ID, _Name, _Age); }} |
本文地址：http://www.cnblogs.com/atree/archive/2011/02/25/Asp-Net_List_Sort_Find_FindAll_Exist.html
