Uses the For Each statement which hides the complexity of the enumerator : ReadOnlyCollectionBase « Data Structure « VB.Net

1. VB.Net
2. Data Structure
3. ReadOnlyCollectionBase

Uses the For Each statement which hides the complexity of the enumerator

 

Imports System
Imports System.Collections

Public Class ROCollection
    Inherits ReadOnlyCollectionBase
    Public Sub New(sourceList As IList)
        InnerList.AddRange(sourceList)
    End Sub 'New
    Default Public ReadOnly Property Item(index As Integer) As [Object]
        Get
            Return InnerList(index)
        End Get
    End Property
    Public Function IndexOf(value As [Object]) As Integer
        Return InnerList.IndexOf(value)
    End Function 
    Public Function Contains(value As [Object]) As Boolean
        Return InnerList.Contains(value)
    End Function 
End Class 


Public Class SamplesCollectionBase

    Public Shared Sub Main()
        Dim myAL As New ArrayList()
        myAL.Add("A")
        myAL.Add("B")
        myAL.Add("C")

        Dim myCol As New ROCollection(myAL)

        PrintValues1(myCol)
        Console.WriteLine("Contains yellow: {0}", myCol.Contains("yellow"))
        Console.WriteLine("orange is at index {0}.", myCol.IndexOf("orange"))
    End Sub 'Main

    Public Shared Sub PrintValues1(myCol As ROCollection)
        Dim obj As [Object]
        For Each obj In  myCol
            Console.WriteLine("   {0}", obj)
        Next obj
        Console.WriteLine()
    End Sub 'PrintValues1
End Class  

   
  

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