ReadOnlyCollection(T) Class Provides the base class for a generic read-only collection. : HashSet « Data Structure « VB.Net

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

ReadOnlyCollection(T) Class Provides the base class for a generic read-only collection.

 

Imports System
Imports System.Collections.Generic
Imports System.Collections.ObjectModel

Public Class Example
    Public Shared Sub Main()
        Dim numbers As New List(Of String)

        numbers.Add("One")
        numbers.Add("Two")
        numbers.Add("Four")
        numbers.Add("Five")

        Dim readOnlyNumbers As New ReadOnlyCollection(Of String)(numbers)

        For Each num As String In readOnlyNumbers
            Console.WriteLine(num)
        Next

        Console.WriteLine(readOnlyNumbers.Count)
        Console.WriteLine(readOnlyNumbers.Contains("Four"))
        Console.WriteLine(readOnlyNumbers(3))
        Console.WriteLine(readOnlyNumbers.IndexOf("Five"))

        numbers.Insert(2, "New Value")

        For Each num As String In readOnlyNumbers
            Console.WriteLine(num)
        Next

        Dim dinoArray(readOnlyNumbers.Count + 1) As String
        readOnlyNumbers.CopyTo(dinoArray, 1)

        Console.WriteLine(dinoArray.Length)
        For Each num As String In dinoArray
            Console.WriteLine(num)
        Next

   End Sub
End Class

   
  

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