A strongly typed collection of your own Objects
Imports System Imports System.Collections Imports System.Collections.Generic Public Class MainClass Shared Sub Main(ByVal args As String()) Dim student_list As New StudentCollection student_list.Add(New Student("A", "E")) student_list.Add(New Student("B", "D")) student_list.Add(New Student("C", "C")) student_list.Add(New Student("D", "B")) student_list.Add(New Student("E", "A")) For Each student As Student In student_list Console.WriteLine(student.ToString) Next student End Sub End Class Public Class Student Private m_FirstName As String Private m_LastName As String Public Sub New(ByVal first_name As String, ByVal last_name As String) m_FirstName = first_name m_LastName = last_name End Sub Public Overrides Function ToString() As String Return m_FirstName & " " & m_LastName End Function End Class ' A strongly typed collection of Students. Public Class StudentCollection Inherits CollectionBase ' Add an Student. Public Sub Add(ByVal value As Student) List.Add(value) End Sub ' Return True if the collection contains this employee. Public Function Contains(ByVal value As Student) As Boolean Return List.Contains(value) End Function ' Return this Student's index. Public Function IndexOf(ByVal value As Student) As Integer Return List.IndexOf(value) End Function ' Insert a new Student. Public Sub Insert(ByVal index As Integer, ByVal value As Student) List.Insert(index, value) End Sub ' Return the Student at this position. Default Public ReadOnly Property Item(ByVal index As Integer) As Student Get Return DirectCast(List.Item(index), Student) End Get End Property ' Remove an Student. Public Sub Remove(ByVal value As Student) List.Remove(value) End Sub End Class
1. | Inherit from CollectionBase |