ASP.NET Tutorial/Collections/SortedList
Содержание
Sorted list
<source lang="csharp">
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="UsingSortedList" Debug="true"%> <!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 id="Head1" runat="server">
<title>SortedList Example</title>
</head> <body>
<form id="form1" runat="server">
SortedList Examples
This example illustrates the use of a SortedList
collection
<asp:Label ID="labMsg" runat="server" />
</form>
</body> </html> File: Default.aspx.cs using System; using System.Data; using System.Configuration; using System.Collections; using System.Web; using System.Web.Security; using System.Web.UI; using System.Web.UI.WebControls; using System.Web.UI.WebControls.WebParts; using System.Web.UI.HtmlControls; public partial class UsingSortedList : System.Web.UI.Page {
protected void Page_Load(object sender, EventArgs e) { Customer c1 = new Customer("1", "A", "AA", "123-4567"); Customer c2 = new Customer("2", "B", "BB", "123-1267"); Customer c3 = new Customer("3", "C", "CC", "123-7823"); Customer c4 = new Customer("4", "D", "DD", "123-6383"); SortedList mySort = new SortedList(); mySort.Add(c1.Id, c1); mySort.Add(c2.Id, c2); mySort.Add(c3.Id, c3); mySort.Add(c4.Id, c4); foreach (Customer c in mySort.Values) { labMsg.Text += c.Id + "," + c.LastName + "labMsg.Text += "
"; }
";
Customer tempCust1 = (Customer)mySort["1"]; labMsg.Text += tempCust1.Id + "," + tempCust1.LastName + "
"; Customer tempCust2 = (Customer)mySort.GetByIndex(3); labMsg.Text += tempCust2.Id + "," + tempCust2.LastName + "
"; }
} public abstract class AbstractEntity {
private string _id; public AbstractEntity(string id) { _id = id; }
public string Id { get { return _id; } set { _id = value; } }
public abstract bool IsValid { get; }
} public class Customer: AbstractEntity {
private string _firstName; private string _lastName; private string _phone; public Customer(string id, string firstName, string lastName, string phone): base(id) { _firstName = firstName; _lastName = lastName; _phone = phone; }
public string FirstName { get { return _firstName; } set { _firstName = value; } } public string LastName { get { return _lastName; } set { _lastName = value; } } public string Phone { get { return _phone; } set { _phone = value; } } public string Name { get { return LastName + ", " + FirstName; } } public override bool IsValid { get { if (Id.Length > 0 && LastName.Length > 0) return true; else return false; } } public override string ToString() { return Id + "," + Name + "," + Phone; }
}</source>
Using a SortedList to sort by values by key (C#)
<source lang="csharp">
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %> <!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>Untitled Page</title>
</head> <body>
<form id="form1" runat="server">
</form>
</body> </html> File: Default.aspx.cs
using System; using System.Collections; public partial class _Default : System.Web.UI.Page {
protected void Page_Load(object sender, EventArgs e) { Person scott = new Person("A", "B"); Person bill = new Person("C", "D"); Person srini = new Person("E", "F"); Hashtable peopleHashtable = new Hashtable(); peopleHashtable.Add("sh", scott); peopleHashtable.Add("be", bill); peopleHashtable.Add("ss", srini); SortedList peopleSortedList = new SortedList(peopleHashtable); foreach (Person p in peopleSortedList.Values) { Response.Write(p.FullName + "
"); } Response.Write("Index of E: " + peopleSortedList.IndexOfKey("ss")); }
} public class Person : IComparable {
string FirstName; string LastName; public Person(string first, string last) { FirstName = first; LastName = last; } public string FullName { get { return FirstName + " " + LastName; } } int IComparable.rupareTo(object obj) { Person p2 = obj as Person; if (p2 == null) throw new ArgumentException("Object is not a Person!"); int lastNameResult = this.LastName.rupareTo(p2.LastName); if (lastNameResult == 0) { int firstNameResult = this.FirstName.rupareTo(p2.FirstName); return firstNameResult; } else { return lastNameResult; } }
}</source>
Using a SortedList to sort by values by key (VB)
<source lang="csharp">
<%@ Page Language="VB" AutoEventWireup="false" CodeFile="Default.aspx.vb" Inherits="_Default" %> <!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>Untitled Page</title>
</head> <body>
<form id="form1" runat="server">
</form>
</body> </html> File: Default.aspx.vb Imports System Imports System.Collections Imports Microsoft.VisualBasic Public Class Person
Implements IComparable Dim FirstName As String Dim LastName As String Public Sub New(ByVal First As String, ByVal Last As String) FirstName = First LastName = Last End Sub Public ReadOnly Property FullName() As String Get Return FirstName & " " & LastName End Get End Property Public Function CompareTo(ByVal obj As Object) _ As Integer Implements IComparable.rupareTo If Not TypeOf (obj) Is Person Then Throw New ArgumentException("Object is not a Person!") End If Dim p2 As Person = CType(obj, Person) Dim lastNameResult As Integer = Me.LastName.rupareTo(p2.LastName) If lastNameResult = 0 Then Dim firstNameResult As Integer = Me.FirstName.rupareTo(p2.FirstName) Return firstNameResult Else Return lastNameResult End If End Function
End Class Partial Class _Default
Inherits System.Web.UI.Page Protected Sub Page_Load(ByVal sender As Object, _ ByVal e As System.EventArgs) Handles Me.Load Dim scott As New Person("A", "B") Dim bill As New Person("C", "D") Dim srini As New Person("E", "F") Dim peopleHashtable As New Hashtable() peopleHashtable.Add("sh", scott) peopleHashtable.Add("be", bill) peopleHashtable.Add("ss", srini) Dim peopleSortedList As SortedList = New SortedList(peopleHashtable) For Each p As Person In peopleSortedList.Values Response.Write(p.FullName & "
") Next Response.Write("Index of E: " & peopleSortedList.IndexOfKey("ss")) End Sub
End Class</source>