Use Sort (), Find (), FindAll (), and Exist () of the List to solve some problems.
Original article address:
Http://www.dotblogs.com.tw/puma/archive/2009/05/28/asp.net-generic-list-sort-find-findall-exsit.aspx#12190
List is often used in recent cases. This is really useful.
Because it has the following things:
List <T>. Sort () → Sort T
List <T>. Find () → Find a T
List <T>. FindAll () → find multiple T
List <T>. Exist () → judge whether the existence of limit T exists
Let's talk about these things ..
GenericList. aspx
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<%@ Page Language="C#" AutoEventWireup="true" CodeFile="GenericList.aspx.cs" Inherits="GenericList" %> |
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> |
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<html xmlns="http://www.w3.org/1999/xhtml"> |
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<title>GenericList</title> |
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<form id="form1" runat="server"> |
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<asp:GridView ID="GridView1" runat="server"> |
GenericList. aspx. cs
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Print?
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using System.Collections.Generic; |
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using System.Web.UI.WebControls; |
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public partial class GenericList : System.Web.UI.Page |
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protected void Page_Load(object sender, EventArgs e) |
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List<Person> lstPerson = new List<Person>(); |
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lstPerson.Add(new Person(1, "puma", 10)); |
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lstPerson.Add(new Person(2, "F6 Team", 20)); |
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lstPerson.Add(new Person(3, "ASP.NET", 30)); |
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lstPerson.Add(new Person(4, "Dotblogs", 40)); |
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// Raw information is displayed on the GridView |
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this.GridView1.DataSource = lstPerson; |
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this.GridView1.DataBind(); |
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// Find the Person whose Name is 'puma' |
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Response.Write("Find the Person with Name = 'puma '→"); |
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Response.Write(lstPerson.Find(delegate(Person p) { return p.Name == "puma"; }).ToString() + "<p>"); |
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// Locate the number of Age> 10 |
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Response.Write("Find the number of Age> 10 →"); |
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Response.Write(lstPerson.FindAll(delegate(Person p) { return p.Age > 10; }).Count.ToString() + "<p>"); |
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// Check whether Name = 'f6 'exists |
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Response.Write("Checking whether Name = 'f6 'exists →"); |
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Response.Write(lstPerson.Exists(delegate(Person p) { return p.Name == "F6"; }).ToString() + "<p>"); |
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// Sort by Name in ascending order |
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Response.Write("<P> sort by Name in ascending order <br/>"); |
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lstPerson.Sort(delegate(Person p1, Person p2) { return Comparer<string>.Default.Compare(p1.Name, p2.Name); }); |
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foreach (Person p in lstPerson) |
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Response.Write(p.ToString() + "<br/>"); |
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// Sort by Name in descending order |
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Response.Write("<P> sort by Name in descending order <br/>"); |
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lstPerson.Sort(delegate(Person p1, Person p2) { return Comparer<string>.Default.Compare(p2.Name, p1.Name); }); |
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foreach (Person p in lstPerson) |
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Response.Write(p.ToString() + "<br/>"); |
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private string _Name; |
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public Person(int ID, string Name, int Age) |
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set { _Name = value; } |
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get { return _Name; } |
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set { _Age = value; } |
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public override string ToString() |
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return string.Format("ID：{0}，Name：{1}，Age：{2}", _ID, _Name, _Age); |
The result of the rows:
Exam Website:
Http://blogs.msdn.com/kcwalina/archive/2004/06/22/162533.aspx
Http://www.dotblogs.com.tw/chhuang/archive/2008/05/08/3908.aspx
