ASP.NET Tutorial/Collections/List — различия между версиями

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Версия 15:30, 26 мая 2010

Generics

<%@ 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">
   <div id="container">
      <h1>Using Generics</h1>
      These two list boxes illustrates the use of two <em>Generic</em> <code>List</code> collections
      
      <asp:ListBox ID="lboxStrings" runat="server"    />
       
      <asp:ListBox ID="lboxCustomers" runat="server" 
         DataTextField="Name"
         DataValueField="Id" />    
     This list boxes illustrates the use of a <em>Generic</em> <code>Dictionary</code> collection
      <asp:ListBox ID="lboxDictionary" 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;
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; 
   }
}
Источник — «http://nfex.ru/index.php?title=ASP.NET_Tutorial/Collections/List&oldid=2773»