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<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="UsingCustomCollection" %>
<!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>Using a Customer Collection</title>
</head>
<body>
<form id="form1" runat="server">
<div id="container">
<h1>Using a Customer Collection</h1>
This example illustrates the use of a custom collection
<asp:DropDownList ID="drpSample" runat="server"
DataTextField="Name"
DataValueField="Id"
/>
</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 partial class UsingCustomCollection : 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");
CustomerCollection cc = new CustomerCollection();
cc.Add(c1);
cc.Add(c2);
cc.Add(c3);
cc.Add(c4);
drpSample.DataSource = cc;
drpSample.DataBind();
}
}
public class CustomerCollection: IEnumerable
{
private ArrayList _customers;
public CustomerCollection()
{
_customers = new ArrayList();
}
public void Add(Customer c)
{
if (c != null)
_customers.Add(c);
}
public Customer this[int index]
{
get {
if (index >= 0 && index < _customers.Count)
return (Customer)_customers[index];
else
return null;
}
}
public Customer FindById(string id)
{
foreach (Customer c in _customers)
{
if (c.Id == id)
return c;
}
return null;
}
public IEnumerator GetEnumerator()
{
return _customers.GetEnumerator();
}
}
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;
}
}
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