Add Range from one list to another

Question

I have a list(of string) and I search it to get a start and end range, I then need to add that range to a separate list

ex: List A = "a" "ab" "abc" "ba" "bac" "bdb" "cba" "zba"

I need List B to be all the b's (3-5)

What I want to do is ListB.Addrange(ListA(3-5))
How can I accomplish this??

Answer 1

Use List.GetRange()

Imports System
Imports System.Collections.Generic

Sub Main()
    '                                               0    1     2      3     4      5      6      7
    Dim ListA As New List(Of String)(New String() {"a", "ab", "abc", "ba", "bac", "bdb", "cba", "zba"})
    Dim ListB As New List(Of String)

    ListB.AddRange(ListA.GetRange(3, 3))
    For Each Str As String In ListB
        Console.WriteLine(Str)
    Next
    Console.ReadLine()
End Sub

or you can use Linq

Imports System
Imports System.Collections.Generic
Imports System.Linq

Module Module1
    Sub Main()
        '                                               0    1     2      3     4      5      6      7
        Dim ListA As New List(Of String)(New String() {"a", "ab", "abc", "ba", "bac", "bdb", "cba", "zba"})
        Dim ListB As New List(Of String)

        ListB.AddRange(ListA.Where(Function(s) s.StartsWith("b")))
        ' This does the same thing as .Where()
        ' ListB.AddRange(ListA.FindAll(Function(s) s.StartsWith("b")))
        For Each Str As String In ListB
            Console.WriteLine(Str)
        Next
        Console.ReadLine()
    End Sub
End Module

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