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Associative Array (C# and Delphi Cross Reference Guide)

By Mike Prestwood

C# versus Delphi: A side by side comparison between C# and Delphi.

Data Structures

Data structures allow you to store and work with data. Common data structures include arrays, associative arrays, etc.

Associative Array

[Other Languages]

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

C#: Dictionary

Syntax Example:

//using System.Collections.Generic;

Dictionary <String, String> airports = new Dictionary <String, String>();

airports.Add("LAX", "Los Angeles"); 
airports.Add("SFO", "San Francisco"); 
airports.Add("SAN", "San Diego");

MessageBox.Show(airports["LAX"]);

C# Associative Array (Dictionary)

Delphi: TStringList Assoc Array

Object Pascal doesn't have a native associative array, but you can use a TStringList the same way. (Alternatively, search the Internet for TStringHash and THashedStringList classes for implementations of a true associative array).

Syntax Example:

var
  StateList : TStringList;
begin
  StateList := TStringList.Create;

  StateList.CommaText := 'CA=California, FL=Florida';

  ShowMessage('FL is ' + StateList.Values['FL']);
end;

Associative Arrays in Delphi/Object Pascal (Use TStringList)