ASP.NET Tutorial/Collections/List
Generics
<source lang="csharp">
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="UsingGenerics" %> <!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 Generics</title>
</head> <body>
<form id="form1" runat="server">
Using Generics
These two list boxes illustrates the use of two GenericListcollections <asp:ListBox ID="lboxStrings" runat="server" /> <asp:ListBox ID="lboxCustomers" runat="server" DataTextField="Name" DataValueField="Id" /> This list boxes illustrates the use of a GenericDictionarycollection <asp:ListBox ID="lboxDictionary" runat="server" DataTextField="Value" DataValueField="Key" />
</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; using System.Collections.Generic; public partial class UsingGenerics : System.Web.UI.Page {
protected void Page_Load(object sender, EventArgs e)
{
List<string> names = new List<string>();
names.Add("A");
names.Add("B");
names.Add("C");
lboxStrings.DataSource = names;
lboxStrings.DataBind();
string temp1 = names[2];
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");
List<Customer> customers = new List<Customer>();
customers.Add(c1);
customers.Add(c2);
customers.Add(c3);
Customer c = customers[2];
customers[1] = c;
lboxCustomers.DataSource = customers;
lboxCustomers.DataBind();
Dictionary<string, Customer> dict = new Dictionary<string, Customer>();
dict.Add(c1.Id, c1);
dict.Add(c2.Id, c2);
lboxDictionary.DataSource = dict;
lboxDictionary.DataBind();
}
} 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>
