List of String or Array or ArrayList

Question

Hopefully a simple question to most programmers with some experience    What is the datatype that lets me do this   Dim lstOfStrings as  IDK   Dim String0 As String    some value  Dim String1 As String    some value  Dim String2 As String    some value  Dim String3 As String    some value  Dim String4 As String    some value  Dim String5 As String    some value    lstOfStrings add String0  String1  String2  String3    I would access these like this  Dim s1   lstOfStrings 0  Dim s2   lstOfStrings 1   Dim s3   lstOfStrings 2   Dim s4   lstOfStrings 3    if I use List of String  I am only able to  add one thing to the list  at a time   and in my function I want to be able to store several values at a time    Solution   Private Function Foo   As List Of String        Dim temp1 As String     Dim temp2 As String      Dim temp3 As String       Dim temp4 As String      Dim temp5 As String      Dim temp6 As String       Dim inputs   As String    temp1  temp2  temp3  temp4  temp5  temp6       Dim lstWriteBits As List Of String    New List Of String  inputs        Return lstWriteBits End Function

User · Answer

look to the List AddRange method here

User · Answer

For those who are stuck maintaining old  net  here is one that works in  net framework 2 x  Dim lstOfStrings As New List of String   new String    quot v1 quot   quot v2 quot   quot v3 quot

User · Answer

Sometimes I don t want to add items to a list when I instantiate it    Instantiate a blank list  Dim blankList As List Of String    New List Of String    Add to the list  blankList Add  Dis be part of me list    blankList is no longer blank  but you get the drift   Loop through the list  For Each item in blankList     write code here  for example    Console WriteLine item  Next

User · Answer

List Of String  will handle that  mostly - though you need to either use AddRange to add a collection of items  or Add to add one at a time   lstOfString Add String1  lstOfString Add String2  lstOfString Add String3  lstOfString Add String4    If you re adding known values  as you show  a good option is to use something like   Dim inputs   As String      some value                                    some value2                                    some value3                                    some value4     Dim lstOfString as List Of String    new List Of String  inputs         Dim s3   lstOfStrings 3    This will still allow you to add items later as desired  but also get your initial values in quickly     Edit   In your code  you need to fix the declaration   Change   Dim lstWriteBits   As List Of String     To   Dim lstWriteBits As List Of String     Currently  you re declaring an Array of List Of String  objects

User · Answer

You can do something like this       Dim lstOfStrings As New List Of String  From   Value1    Value2    Value3     Collection Initializers

User · Answer

You can use IList Of String  in the  function    Private Function getWriteBits   As IList Of String    Dim temp1 As String Dim temp2 As Boolean Dim temp3 As Boolean    Pallet Destination Unique Dim temp4 As Boolean Dim temp5 As Boolean Dim temp6 As Boolean  Dim lstWriteBits As Ilist    temp1  temp2  temp3  temp4  temp5  temp6   Return lstWriteBits End Function   use  list1 AddRange list2  to add lists  Hope it helps

User · Answer

Neither collection will let you add items that way   You can make an extension to make for examle List Of String  have an Add method that can do that   Imports System Runtime CompilerServices Module StringExtensions     lt Extension   gt    Public Sub Add ByVal list As List Of String   ParamArray values As String        For Each s As String In values       list Add s      Next   End Sub  End Module   Now you can add multiple value in one call   Dim lstOfStrings as New List Of String  lstOfStrings Add String1  String2  String3  String4

[vb.net] List(of String) or Array or ArrayList

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