VB.NET List

The List class is used to store generic types of collections objects. By using a generic class on the list, we can store one type of object. The List size can be dynamically different depending on the need of the application, such as adding, searching or inserting elements into a list. A VB.NET List class is provided by the System.Collection.Generic namespace.

Properties of the VB.NET List

The following are the commonly used properties of the List.

Property name	Description
Capacity	It is used to obtain or set a number that indicates the number of elements can be placed in a list.
Count	It is used to count the number of elements available in the List.
Item	It is used to get or set an item at a specified position of the List.

VB.NET List Methods

The following are the methods of VB.NET List class for performing various operations like add, search, remove, sort.

Method	Description
Add	As the name represents, the Add() method is used to add an object at the end of the List
AddRange	It is used to add the elements of the specified collection to the end of the List.
Clear	It is used to clear all records from the List.
Contains	It is used to validate whether the specified object exists in the List or not.
CopyTo	A CopyTo() method is used to copy all records of a list into a one-dimensional array.
Find	A Find() method is used to search for a specified element from a list that matches the defined state and returns the first occurrence.
FindAll	A FindAll() method is used to fetch all the elements from a list that matches the condition defined by the specified predicate.
Insert	It is used to insert an element at the specified position of the List.
InsertRange	It is used to insert all elements of a specified collection in a list start from a specified location.
Remove	By using the Remove() method, we can delete a specified element from the list.
RemoveAt	By using the RemoveAt() method in a list, we can delete an element from the specified location in a list.
Reverse	The Reverse() method is used to reverse the order list of elements.
Sort	A Sort() method is used to sort the elements of the list.
ToArray	It is used to copy all the elements of the list to a new array object.

Let us create a program to understand how we can add new elements to a dynamic array in the VB.NET programming language.

Ar_List.vb

Imports System.Collections.Generic
Module Ar_List
    Sub Main()
        Dim Lt As List(Of Integer) = New List(Of Integer)()
        Dim i As Integer
        'Dim j As String
        Console.WriteLine(" Added elements in List1")
        ' Use of Add() function
        Lt.Add(50)
        Lt.Add(55)
        Lt.Add(10)
        'Lt.Add(70)

        Dim Lt2 As List(Of String) = New List(Of String)()
        Lt2.Add("Welcome")
        Lt2.Add("to")
        Lt2.Add("JavaTpoint")
        Lt2.Add("Site")

        'Access all element of List1
        For Each i In Lt
            Console.WriteLine("{0}", i)
        Next i
        Console.WriteLine("Total elements in list1: {0}", Lt.Count)
        Console.WriteLine("Number of elements can be placed in list1: {0}", Lt.Capacity)
        Console.WriteLine()

        'Access all element of list2
        Console.WriteLine(" Added elements in List2")
        For Each j In Lt2
            Console.WriteLine("{0}", j)
        Next j
        Console.WriteLine("Total elements in list2: {0}", Lt2.Count)
        Console.WriteLine("Number of elements can be placed in list2: {0}", Lt2.Capacity)
        Console.WriteLine()

        'Use Remove() function to delete an element
        Console.WriteLine("The 'Site' Element to be removed from the List2", Lt2.Remove("Site"))
        'Retrieve using For Loop
        For Each j In Lt2
            Console.WriteLine("{0}", j)
        Next j
        Console.WriteLine("Press any key to exit...")
        Console.ReadKey()
    End Sub
End Module

Output:

Let us create a program to understand the Insert(), Contains(), Copy array to List, and Sort() function in the VB.NET.

A_List2.vb

Imports System.Collections.Generic
Module A_List2
    Sub Main()
        Dim Lt As List(Of Integer) = New List(Of Integer)()
        Dim i As Integer

        Console.WriteLine(" Insert 60 and 5 in the List")
        ' Use of Add() function
        Lt.Add(50)
        Lt.Add(55)
        Lt.Add(10)
        Lt.Add(70)

        ' Insert an Item in the list
        Lt.Insert(2, 60)
        Lt.Insert(4, 5)
        'Access all element of List1
        For Each i In Lt
            Console.WriteLine("{0}", i)
        Next i
        Console.WriteLine()

        ' Use of Contains() Function to check an item is exit
        If Lt.Contains("60") Then
            Console.WriteLine(" Number '60' is exist in the List")
        Else
            Console.WriteLine(" Not exist")
        End If

        ' Copy array to list
        Dim Str_Ar As String() = New String(4) {}
        Str_Ar(0) = "Apple"
        Str_Ar(1) = "Mango"
        Str_Ar(2) = "Banana"
        Str_Ar(3) = "Orange"
        Dim ar_List As New List(Of String)(Str_Ar)

        For Each St As String In Str_Ar
            Console.WriteLine(St)
        Next

        'Sort element of List
        Lt.Sort()
        Console.WriteLine(" Sorted Elements in the List:")
        For Each i In Lt
            Console.WriteLine("{0}", i)
        Next i
        Console.WriteLine("Press any key to exit...")
        Console.ReadKey()
    End Sub
End Module

Output:

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