ASP.NET Tutorial/Collections/Hashtable

Содержание

1 Hashtable collection
2 Retrieving Person objects from a Hashtable (C#)
3 Retrieving Person objects from a Hashtable (VB)
4 Using For Each with a Hashtable"s default IEnumerator implementation (C#)
5 Using For Each with a Hashtable"s default IEnumerator implementation (VB)
6 Using For Each with a Hashtable"s Keys and Values member collections (C#)
7 Using For Each with a Hashtable"s Keys and Values member collections (VB)

Hashtable collection

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="UsingHashtable" %>
<!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>Hashtable Example</title>
</head>
<body>
    <form id="form1" runat="server">
   <div id="container">
      <h1>Hashtable Example</h1>
      
      <asp:ListBox ID="lboxCustomers" runat="server" 
         DataTextField="Value"
         DataValueField="Key" />   
         
   </div>
    </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 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 
{
   // data members
   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; 
   }
}
public partial class UsingHashtable : 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", "123-7823");
       Customer c3 = new Customer("3", "C", "CC", "123-6383");
       Hashtable table = new Hashtable();
       table.Add(c1.Id, c1);
       table.Add(c2.Id, c2);
       table.Add(c3.Id, c3);
       lboxCustomers.DataSource = table;
       lboxCustomers.DataBind();
    }
}

Retrieving Person objects from a Hashtable (C#)

<%@ 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">
    <div>
    
    </div>
    </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);
        Person found = (Person)peopleHashtable["sh"];
        Response.Write(found.FullName + "<BR/>");
        found = (Person)peopleHashtable["be"];
        Response.Write(found.FullName + "<BR/>");
        found = (Person)peopleHashtable["sh"];
        Response.Write(found.FullName + "<BR/>");
    }
}
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;
        }
    }
}

Retrieving Person objects from a Hashtable (VB)

<%@ 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">
    <div>
    
    </div>
    </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 found As Person = CType(peopleHashtable("sh"), Person)
        Response.Write(found.FullName & "<BR/>")
        found = CType(peopleHashtable("be"), Person)
        Response.Write(found.FullName & "<BR/>")
        found = CType(peopleHashtable("sh"), Person)
        Response.Write(found.FullName & "<BR/>")
    End Sub
End Class

Using For Each with a Hashtable"s default IEnumerator implementation (C#)

<%@ 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">
    <div>
    
    </div>
    </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);
        Person found = (Person)peopleHashtable["sh"];
        Response.Write(found.FullName + "<BR/>");
        found = (Person)peopleHashtable["be"];
        Response.Write(found.FullName + "<BR/>");
        found = (Person)peopleHashtable["sh"];
        Response.Write(found.FullName + "<BR/>");
        foreach (DictionaryEntry de in peopleHashtable)
        {
            Response.Write(de.Key.ToString() + ":" + ((Person)de.Value).FullName +
               "<BR/>");
        }
    }
}
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;
        }
    }
}

Using For Each with a Hashtable"s default IEnumerator implementation (VB)

<%@ 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">
    <div>
    
    </div>
    </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 found As Person = CType(peopleHashtable("sh"), Person)
        Response.Write(found.FullName & "<BR/>")
        found = CType(peopleHashtable("be"), Person)
        Response.Write(found.FullName & "<BR/>")
        found = CType(peopleHashtable("sh"), Person)
        Response.Write(found.FullName & "<BR/>")
        For Each de As DictionaryEntry In peopleHashtable
            Response.Write(de.Key.ToString() & ":" & CType(de.Value, Person).FullName & _
               "<BR/>")
        Next
    End Sub
End Class

Using For Each with a Hashtable"s Keys and Values member collections (C#)

<%@ 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">
    <div>
    
    </div>
    </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);
        Person found = (Person)peopleHashtable["sh"];
        Response.Write(found.FullName + "<BR/>");
        found = (Person)peopleHashtable["be"];
        Response.Write(found.FullName + "<BR/>");
        found = (Person)peopleHashtable["sh"];
        Response.Write(found.FullName + "<BR/>");
        foreach (string s in peopleHashtable.Keys)
        {
            Response.Write(s + "<BR/>");
        }
        foreach (Person p in peopleHashtable.Values)
        {
            Response.Write(p.FullName + "<BR/>");
        }
    }
}
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;
        }
    }
}

Using For Each with a Hashtable"s Keys and Values member collections (VB)

<%@ 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">
    <div>
    
    </div>
    </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 found As Person = CType(peopleHashtable("sh"), Person)
        Response.Write(found.FullName & "<BR/>")
        found = CType(peopleHashtable("be"), Person)
        Response.Write(found.FullName & "<BR/>")
        found = CType(peopleHashtable("sh"), Person)
        Response.Write(found.FullName & "<BR/>")
        For Each s As String In peopleHashtable.Keys
            Response.Write(s & "<BR/>")
        Next
        For Each p As Person In peopleHashtable.Values
            Response.Write(p.FullName & "<BR/>")
        Next
    End Sub
End Class

ASP.NET Tutorial/Collections/Hashtable

Содержание

Hashtable collection

Retrieving Person objects from a Hashtable (C#)

Retrieving Person objects from a Hashtable (VB)

Using For Each with a Hashtable"s default IEnumerator implementation (C#)

Using For Each with a Hashtable"s default IEnumerator implementation (VB)

Using For Each with a Hashtable"s Keys and Values member collections (C#)

Using For Each with a Hashtable"s Keys and Values member collections (VB)

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