Содержание

1 Iteraion
2 Iteration Examples
3 Generics Iteration Examples

Iteraion

   <source lang="csharp">

<%@ 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">

Iteration Examples

     This example illustrates the different ways you can iterate through a collection
     
     <asp:Label ID="labMsg" runat="server" />

   </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 = "

First Iteration Output (ArrayList)

";

      for (int i = 0; i < myList.Count; i++)
      {
         Customer c = (Customer)myList[i];
         labMsg.Text += c.FirstName + "
";
      }

labMsg.Text += "

Second Iteration Output (ArrayList)

";

      foreach (Customer c in myList)
      {
         labMsg.Text += c.FirstName + "
";
      }

labMsg.Text += "

Third Iteration Output (ArrayList)

";

      IEnumerator ie = myList.GetEnumerator();
      while (ie.MoveNext())
      {
         Customer c = (Customer)ie.Current;
         labMsg.Text += c.FirstName + "
";
      }
     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 += "

Fourth Iteration Output (Hashtable)

";

     foreach (DictionaryEntry de in myTable)
     {
        Customer c = (Customer)de.Value;
        labMsg.Text += c.FirstName + "
";
     }

labMsg.Text += "

Fifth Iteration Output (Hashtable)

";

     foreach (Customer c in myTable.Values)
     {
        labMsg.Text += c.FirstName + "
";
     }
   }

} 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>