Iteration Examples Generics : IEnumerator « Collections « ASP.NET Tutorial






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  3. IEnumerator
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="IterationExamplesGenerics" %>

<!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>Iteration Examples Generics</title>
</head>
<body>
    <form id="form1" runat="server">
   <div id="container">
      <h1>Generics Iteration Examples</h1>
      This example illustrates the different ways you can iterate through a generic collection
      
      <asp:Label ID="labMsg" runat="server" />
   </div>
    </form>
</body>
</html>

File: Default.aspx.cs

using System;
using System.Data;
using System.Configuration;
using System.Collections.Generic;
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 IterationExamplesGenerics : 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");

       List<Customer> myList = new List<Customer>();
       myList.Add(c1);
       myList.Add(c2);
       myList.Add(c3);
       myList.Add(c4);

       labMsg.Text = "<h2>First Iteration Output (List)</h2>";
       for (int i = 0; i < myList.Count; i++)
       {
          Customer c = myList[i];
          labMsg.Text += c.FirstName + "<br/>";
       }

       labMsg.Text += "<h2>Second Iteration Output (List)</h2>";
       foreach (Customer c in myList)
       {
          labMsg.Text += c.FirstName + "<br/>";
       }

       labMsg.Text += "<h2>Third Iteration Output (List)</h2>";
       IEnumerator<Customer> ie = myList.GetEnumerator();
       while (ie.MoveNext())
       {
          Customer c = ie.Current;
          labMsg.Text += c.FirstName + "<br/>";
       }

       Dictionary<string,Customer> dict = new Dictionary<string,Customer>();
       dict.Add(c1.Id, c1);
       dict.Add(c2.Id, c2);
       dict.Add(c3.Id, c3);
       dict.Add(c4.Id, c4);

       labMsg.Text += "<h2>Fourth Iteration Output (Dictionary)</h2>";
       foreach (KeyValuePair<string, Customer> pair in dict)
       {
          Customer c = pair.Value;
          labMsg.Text += c.FirstName + "<br/>";
       }

       labMsg.Text += "<h2>Fifth Iteration Output (Dictionary)</h2>";
       foreach (Customer c in dict.Values)
       {
          labMsg.Text += c.FirstName + "<br/>";
       }
    }
}

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; 
   }
}








7.7.IEnumerator
7.7.1.Iteraion
7.7.2.Iteration Examples Generics