ASP.NET Tutorial/Collections/IEnumerator

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Iteraion

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="IterationExamples" %>
<!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>Iteration Examples</title>
</head>
<body>
    <form id="form1" runat="server">
   <div id="container">
      <h1>Iteration Examples</h1>
      This example illustrates the different ways you can iterate through a 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;
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 IterationExamples : 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");
       ArrayList myList = new ArrayList();
       myList.Add(c1);
       myList.Add(c2);
       myList.Add(c3);
       myList.Add(c4);
       labMsg.Text = "<h2>First Iteration Output  (ArrayList)</h2>";
       for (int i = 0; i < myList.Count; i++)
       {
          Customer c = (Customer)myList[i];
          labMsg.Text += c.FirstName + "<br/>";
       }
       labMsg.Text += "<h2>Second Iteration Output (ArrayList)</h2>";
       foreach (Customer c in myList)
       {
          labMsg.Text += c.FirstName + "<br/>";
       }
       labMsg.Text += "<h2>Third Iteration Output (ArrayList)</h2>";
       IEnumerator ie = myList.GetEnumerator();
       while (ie.MoveNext())
       {
          Customer c = (Customer)ie.Current;
          labMsg.Text += c.FirstName + "<br/>";
       }
      Hashtable myTable = new Hashtable();
      myTable.Add(c1.Id, c1);
      myTable.Add(c2.Id, c2);
      myTable.Add(c3.Id, c3);
      myTable.Add(c4.Id, c4);

      labMsg.Text += "<h2>Fourth Iteration Output (Hashtable)</h2>";
      foreach (DictionaryEntry de in myTable)
      {
         Customer c = (Customer)de.Value;
         labMsg.Text += c.FirstName + "<br/>";
      }
      labMsg.Text += "<h2>Fifth Iteration Output (Hashtable)</h2>";
      foreach (Customer c in myTable.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; 
   }
}


Iteration Examples Generics

<%@ 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; 
   }
}
Источник — «http://nfex.ru/index.php?title=ASP.NET_Tutorial/Collections/IEnumerator&oldid=2770»