ASP.NET Tutorial/Collections/Array

Содержание

1 Array binding
2 Array with custom objects
3 Define and use array in asp.net page (C#)
4 Define and use array in asp.net page (VB)
5 Looking for an object in an array by reference (C#)
6 Looking for an object in an array by reference (VB)
7 Searching for an equivalent object with Array.BinarySearch (C#)
8 Searching for an equivalent object with Array.BinarySearch (VB)
9 Searching for a object in an array by reference (C#)
10 Searching for a object in an array by reference (VB)
11 Sorting arrays of Person (C#)
12 Sorting arrays of Person (VB)

Array binding

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="SimpleArrayDataBinding" %>
<!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>Simple Data Binding to Array</title>
</head>
<body>
    <form id="form1" runat="server">
   <div id="container">
      <h1>Simple Data Binding to Array</h1>
      This example illustrates simple data binding. The drop-down list is data bound to an array.
      <asp:DropDownList ID="drpSample" 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 SimpleArrayDataBinding : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
       string[] names;
       names = new string[3] { "Austen", "Dante", "Goethe" };
       drpSample.DataSource = names;
       drpSample.DataBind();
    }
}

Array with custom objects

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="UsingArrays" %>
<!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>Using Arrays</title>
</head>
<body>
    <form id="form1" runat="server">
   <div id="container">
      <h1>Using Objects in an Array</h1>
      This example illustrates how an array can contain multiple objects.
      <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 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; 
   }
}
public partial class UsingArrays : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
      Customer[] myCustomers = new Customer[] {
         new Customer("1", "A", "AA", "123-4567"),
         new Customer("2", "B", "BB", "456-1267"),
         new Customer("3", "C", "CC", "564-7823"),
         new Customer("4", "D", "DD", "253-6383")
      };
      Customer c1 = myCustomers[2];
      labMsg.Text = c1.FirstName + "<br/>";
      labMsg.Text += myCustomers.GetUpperBound(0) + "," + myCustomers.Length ;
       labMsg.Text += "<h2>Iteration Output</h2>";
       IEnumerator ie = myCustomers.GetEnumerator();
       while (ie.MoveNext())
       {
          Customer c = (Customer)ie.Current;
          labMsg.Text += c.FirstName + "<br/>";
       }
    }
}

Define and use array in asp.net page (C#)

<%@ Page Language="C#" %>
<script runat="server">
   string[] arrColors = new string[5];
   
   void Page_Load(Object Sender, EventArgs e) {
      arrColors[0] = "green";
      arrColors[1] = "red";
      arrColors[2] = "yellow";
      arrColors[3] = "blue";
      arrColors[4] = "violet";
      
      Response.Write("The first element is: ");
      Response.Write(arrColors[0] + "");
      
      Response.Write("The third element is: ");
      Response.Write(arrColors[2] + "");
      
      Response.Write("The 5-3 element is: ");
      Response.Write(arrColors[5-3] + "");
   }
</script>
<html><body>
</body></html>

Define and use array in asp.net page (VB)

<%@ Page Language="VB" %>
<script runat="server">
   dim arrColors(5) as String
   
   sub Page_Load(Sender as object, e as eventargs)
      arrColors(0) = "green"
      arrColors(1) = "red"
      arrColors(2) = "yellow"
      arrColors(3) = "blue"
      arrColors(4) = "violet"
      
      Response.Write("The first element is: ")
      Response.Write(arrColors(0) & "")
      
      Response.Write("The third element is: ")
      Response.Write(arrColors(2) & "")
      
      Response.Write("The 5-3 element is: ")
      Response.Write(arrColors(5-3) & "")
   end sub      
</script>
<html><body>
</body></html>

Looking for an object in an array by reference (C#)

<%@ Page Language="C#" AutoEventWireup="true"  CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!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>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    
    </div>
    </form>
</body>
</html>
File: Default.aspx.cs

using System;
using System.Data;
using System.Configuration;
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 _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        Person scott = new Person("A", "B");
        Person bill = new Person("C", "D");
        Person srini = new Person("E", "F");
        Person[] people = { bill, scott, srini };
        int indexOfC = Array.IndexOf(people, bill);
        Response.Write("C is at " + indexOfC + "<BR/>");
        int indexOfA = Array.IndexOf(people, scott);
        Response.Write("A is at " + indexOfA + "<BR/>");
    }
}
public class Person
{
    string FirstName;
    string LastName;
    public Person(string first, string last)
    {
        FirstName = first;
        LastName = last;
    }
    public string FullName
    {
        get
        {
            return FirstName + " " + LastName;
        }
    }
}

Looking for an object in an array by reference (VB)

<%@ Page Language="VB" AutoEventWireup="false" CodeFile="Default.aspx.vb" Inherits="_Default" %>
<!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>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    
    </div>
    </form>
</body>
</html>
File: Default.aspx.vb
Imports Microsoft.VisualBasic
Partial Class _Default
    Inherits System.Web.UI.Page
    Protected Sub Page_Load(ByVal sender As Object, _
            ByVal e As System.EventArgs) Handles Me.Load
        Dim scott As New Person("A", "B")
        Dim bill As New Person("C", "D")
        Dim srini As New Person("E", "F")
        Dim people() As Person = {bill, scott, srini}
        Dim indexOfC As Integer = Array.IndexOf(people, bill)
        Response.Write("C is at " & indexOfC & "<BR/>")
        Dim indexOfA As Integer = Array.IndexOf(people, scott)
        Response.Write("A is at " & indexOfA & "<BR/>")
    End Sub
End Class

Public Class Person
    Dim FirstName As String
    Dim LastName As String
    Public Sub New(ByVal First As String, ByVal Last As String)
        FirstName = First
        LastName = Last
    End Sub
    Public ReadOnly Property FullName() As String
        Get
            Return FirstName & " " & LastName
        End Get
    End Property
End Class

Searching for an equivalent object with Array.BinarySearch (C#)

<%@ Page Language="C#" AutoEventWireup="true"  CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!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>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    
    </div>
    </form>
</body>
</html>
File: Default.aspx.cs
using System;
using System.Data;
using System.Configuration;
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 _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        Person scott = new Person("A", "B");
        Person bill = new Person("C", "D");
        Person srini = new Person("E", "F");
        Person[] people = { bill, scott, srini };
        int indexOfC = Array.IndexOf(people, bill);
        Response.Write("C is at " + indexOfC + "<BR/>");
        int indexOfA = Array.IndexOf(people, scott);
        Response.Write("A is at " + indexOfA + "<BR/>");
        Person scott2 = new Person("A", "B");
        int indexOfA2 = Array.IndexOf(people, scott2);
        Response.Write("A #2 is at " + indexOfA2 + "<BR/>");
        int indexOfEquivalentA = Array.BinarySearch(people, scott2);
        Response.Write("An Equivalent A is at " + indexOfEquivalentA + "<BR/>");
    }
}
public class Person : IComparable
{
    string FirstName;
    string LastName;
    public Person(string first, string last)
    {
        FirstName = first;
        LastName = last;
    }
    public string FullName
    {
        get
        {
            return FirstName + " " + LastName;
        }
    }
    int IComparable.rupareTo(object obj)
    {
        Person p2 = obj as Person;
        if (p2 == null) throw new ArgumentException("Object is not a Person!");
        int lastNameResult = this.LastName.rupareTo(p2.LastName);
        if (lastNameResult == 0)
        {
            int firstNameResult = this.FirstName.rupareTo(p2.FirstName);
            return firstNameResult;
        }
        else
        {
            return lastNameResult;
        }
    }
}

Searching for an equivalent object with Array.BinarySearch (VB)

<%@ Page Language="VB" AutoEventWireup="false" CodeFile="Default.aspx.vb" Inherits="_Default" %>
<!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>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    
    </div>
    </form>
</body>
</html>
File: Default.aspx.vb
Imports Microsoft.VisualBasic
Public Class Person
    Implements IComparable
    Dim FirstName As String
    Dim LastName As String
    Public Sub New(ByVal First As String, ByVal Last As String)
        FirstName = First
        LastName = Last
    End Sub
    Public ReadOnly Property FullName() As String
        Get
            Return FirstName & " " & LastName
        End Get
    End Property
    Public Function CompareTo(ByVal obj As Object) _
        As Integer Implements IComparable.rupareTo
        If Not TypeOf (obj) Is Person Then
            Throw New ArgumentException("Object is not a Person!")
        End If
        Dim p2 As Person = CType(obj, Person)
        Dim lastNameResult As Integer = Me.LastName.rupareTo(p2.LastName)
        If lastNameResult = 0 Then
            Dim firstNameResult As Integer = Me.FirstName.rupareTo(p2.FirstName)
            Return firstNameResult
        Else
            Return lastNameResult
        End If
    End Function
End Class
Partial Class _Default
    Inherits System.Web.UI.Page
    Protected Sub Page_Load(ByVal sender As Object, _
            ByVal e As System.EventArgs) Handles Me.Load
        Dim scott As New Person("A", "B")
        Dim bill As New Person("C", "D")
        Dim srini As New Person("E", "F")
        Dim people() As Person = {bill, scott, srini}
        Dim indexOfC As Integer = Array.IndexOf(people, bill)
        Response.Write("C is at " & indexOfC & "<BR/>")
        Dim indexOfA As Integer = Array.IndexOf(people, scott)
        Response.Write("A is at " & indexOfA & "<BR/>")
        Dim scott2 As New Person("A", "B")
        Dim indexOfA2 As Integer = Array.IndexOf(people, scott2)
        Response.Write("A #2 is at " & indexOfA2 & "<BR/>")
        Dim indexOfEquivalentA As Integer = Array.BinarySearch(people, scott2)
        Response.Write("An Equivalent A is at " & indexOfEquivalentA & "<BR/>")
    End Sub
End Class

Searching for a object in an array by reference (C#)

<%@ Page Language="C#" AutoEventWireup="true"  CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!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>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    
    </div>
    </form>
</body>
</html>
File: Default.aspx.cs
using System;
using System.Data;
using System.Configuration;
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 _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        Person scott = new Person("A", "B");
        Person bill = new Person("C", "D");
        Person srini = new Person("E", "F");
        Person[] people = { bill, scott, srini };
        int indexOfC = Array.IndexOf(people, bill);
        Response.Write("C is at " + indexOfC + "<BR/>");
        int indexOfA = Array.IndexOf(people, scott);
        Response.Write("A is at " + indexOfA + "<BR/>");
        Person scott2 = new Person("A", "B");
        int indexOfA2 = Array.IndexOf(people, scott2);
        Response.Write("A #2 is at " + indexOfA2 + "<BR/>");
    }
}
public class Person
{
    string FirstName;
    string LastName;
    public Person(string first, string last)
    {
        FirstName = first;
        LastName = last;
    }
    public string FullName
    {
        get
        {
            return FirstName + " " + LastName;
        }
    }
}

Searching for a object in an array by reference (VB)

<%@ Page Language="VB" AutoEventWireup="false" CodeFile="Default.aspx.vb" Inherits="_Default" %>
<!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>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    
    </div>
    </form>
</body>
</html>
File: Default.aspx.vb
Imports Microsoft.VisualBasic
Public Class Person
    Dim FirstName As String
    Dim LastName As String
    Public Sub New(ByVal First As String, ByVal Last As String)
        FirstName = First
        LastName = Last
    End Sub
    Public ReadOnly Property FullName() As String
        Get
            Return FirstName & " " & LastName
        End Get
    End Property
End Class
Partial Class _Default
    Inherits System.Web.UI.Page
    Protected Sub Page_Load(ByVal sender As Object, _
            ByVal e As System.EventArgs) Handles Me.Load
        Dim scott As New Person("A", "B")
        Dim bill As New Person("C", "D")
        Dim srini As New Person("E", "F")
        Dim people() As Person = {bill, scott, srini}
        Dim indexOfC As Integer = Array.IndexOf(people, bill)
        Response.Write("C is at " & indexOfC & "<BR/>")
        Dim indexOfA As Integer = Array.IndexOf(people, scott)
        Response.Write("A is at " & indexOfA & "<BR/>")
        Dim scott2 As New Person("A", "B")
        Dim indexOfA2 As Integer = Array.IndexOf(people, scott2)
        Response.Write("A #2 is at " & indexOfA2 & "<BR/>")
    End Sub
End Class

Sorting arrays of Person (C#)

<%@ Page Language="C#" AutoEventWireup="true"  CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!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>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    
    </div>
    </form>
</body>
</html>
File: Default.aspx.cs
using System;
using System.Data;
using System.Configuration;
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 _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        Person scott = new Person("A", "B");
        Person bill = new Person("C", "D");
        Person srini = new Person("E", "F");
        Person[] people = { scott, bill, srini };
        Response.Write("Unsorted. We used foreach.<BR/>");
        foreach (Person p in people)
        {
            Response.Write(p.FullName + "<BR/>");
        }
        Response.Write("Sort...<BR/>");
        Array.Sort(people);
        Response.Write("Sorted. We used foreach.<BR/>");
        foreach (Person p in people)
        {
            Response.Write(p.FullName + "<BR/>");
        }
    }
}

public class Person : IComparable
{
    string FirstName;
    string LastName;
    public Person(string first, string last)
    {
        FirstName = first;
        LastName = last;
    }
    public string FullName
    {
        get
        {
            return FirstName + " " + LastName;
        }
    }
    int IComparable.rupareTo(object obj)
    {
        Person p2 = obj as Person;
        if (p2 == null) throw new ArgumentException("Object is not a Person!");
        int lastNameResult = this.LastName.rupareTo(p2.LastName);
        if (lastNameResult == 0)
        {
            int firstNameResult = this.FirstName.rupareTo(p2.FirstName);
            return firstNameResult;
        }
        else
        {
            return lastNameResult;
        }
    }
}

Sorting arrays of Person (VB)

<%@ Page Language="VB" AutoEventWireup="false" CodeFile="Default.aspx.vb" Inherits="_Default" %>
<!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>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    
    </div>
    </form>
</body>
</html>
File: Default.aspx.vb
Imports Microsoft.VisualBasic
Public Class Person
    Implements IComparable
    Dim FirstName As String
    Dim LastName As String
    Public Sub New(ByVal First As String, ByVal Last As String)
        FirstName = First
        LastName = Last
    End Sub
    Public ReadOnly Property FullName() As String
        Get
            Return FirstName & " " & LastName
        End Get
    End Property
    Public Function CompareTo(ByVal obj As Object) _
        As Integer Implements IComparable.rupareTo
        If Not TypeOf (obj) Is Person Then
            Throw New ArgumentException("Object is not a Person!")
        End If
        Dim p2 As Person = CType(obj, Person)
        Dim lastNameResult As Integer = Me.LastName.rupareTo(p2.LastName)
        If lastNameResult = 0 Then
            Dim firstNameResult As Integer = Me.FirstName.rupareTo(p2.FirstName)
            Return firstNameResult
        Else
            Return lastNameResult
        End If
    End Function
End Class
Partial Class _Default
    Inherits System.Web.UI.Page
    Protected Sub Page_Load(ByVal sender As Object, _
            ByVal e As System.EventArgs) Handles Me.Load
        Dim scott As New Person("A", "B")
        Dim bill As New Person("C", "D")
        Dim srini As New Person("E", "F")
        Dim people() As Person = {scott, bill, srini}
        Response.Write("Unsorted. We used foreach.<BR/>")
        For Each p As Person In people
            Response.Write(p.FullName & "<BR/>")
        Next
        Response.Write("Sort...<BR/>")
        Array.Sort(people)
        Response.Write("Sorted. We used foreach.<BR/>")
        For Each p As Person In people
            Response.Write(p.FullName & "<BR/>")
        Next
    End Sub
End Class

ASP.NET Tutorial/Collections/Array

Содержание

Array binding

Array with custom objects

Define and use array in asp.net page (C#)

Define and use array in asp.net page (VB)

Looking for an object in an array by reference (C#)

Looking for an object in an array by reference (VB)

Searching for an equivalent object with Array.BinarySearch (C#)

Searching for an equivalent object with Array.BinarySearch (VB)

Searching for a object in an array by reference (C#)

Searching for a object in an array by reference (VB)

Sorting arrays of Person (C#)

Sorting arrays of Person (VB)

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