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VB.Net Language Basics:

VB.Net Associative Array (Dictionary)

By Mike Prestwood

Posted 16 years ago on 11/4/2008 and updated 1/20/2009

VB.Net Code Snippet:

To/From Code Guide: VB.Net Associative A... vs. Other Languages

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Tags: VB.Net , Associative Array

KB101520

General Info: Associative Array

A set of unique keys linked to a set of values. Each unique key is associated with a value. Think of it as a two column table. MyArray['CA'] = 'California' MyArray['AR'] = 'Arizona'

Languages Focus: Associative Array

Associative arrays are also known as a dictionary or a hash table in other languages.

VB.Net Associative Array

An associative array links a set of keys to a set of values. In Visual Basic, associative arrays are implemented as Dictionaries.

This code produces a message box saying "Nevada."

Syntax Example:

//Imports System.Collections.Generic
�

Dim States As New Dictionary(Of String, String)


States.Add("CA", "California")
States.Add("NV", "Nevada")

MsgBox(States("NV"))

About Associative Array
A set of unique keys linked to a set of values. Each unique key is associated with a value. Think of it as a two column table. MyArray['CA'] = 'California' MyArray['AR'] = 'Arizona'

More Info

Definition:	Associative Array
Code:	Associative Arrays in Visual Basic (a Dictionary)

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Code Contributed By Mike Prestwood:

Mike Prestwood is a drummer, an author, and creator of the PrestwoodBoards online community. He is the President & CEO of Prestwood IT Solutions. Prestwood IT provides Coding, Website, and Computer Tech services. Mike has authored 6 computer books and over 1,200 articles. As a drummer, he maintains play-drums.com and has authored 3 drum books. If you have a project you wish to discuss with Mike, you can send him a private message through his PrestwoodBoards home page or call him 9AM to 4PM PST at 916-726-5675 x205.

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Linked Certification Question(s)

The following are practice certification questions with answers highlighted. These questions were prepared by Mike Prestwood and are intended to stress an important aspect of this KB post. All our practice questions are intended to prepare you generally for passing any certification test as well as prepare you for professional work.

Intermediate

1 Intermediate Level Question

Question #1: Multiple Choice

Which code snippet is the correct syntax for declaring and using an associative array?

Answer:

//Imports System.Collections.Generic

Dim States As New Collection


States.Add("CA", "California")
States.Add("NV", "Nevada")

MsgBox(States("NV"))

//Imports System.Collections.Generic

Dim States As New _
        Dictionary(Of String, String)


States.Add("CA", "California")
States.Add("NV", "Nevada")

MsgBox(States("NV"))

//Imports System.Collections.Generic

Dim States As New _
   Collection(Of String, String)

  
States("CA") = "California"
States("NV") = "Nevada"

MsgBox(States.Item("NV"))

//Imports System.Collections.Generic

Dim States As New Collection(Of String)


States.Add("CA", "California")
States.Add("NV", "Nevada")

MsgBox(States.Item("NV"))

//Imports System.Collections.Generic

Dim States As New Array(String, String)


States.Add("California", "CA")
States.Add("Nevada", "NV")

MsgBox(States.ListItem("NV"))

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