Associative array is very useful due to its flexibility and expandability. It can contain any data types and unlimited sub arrays. So far, .NET framework has not provide similar functionality with PHP associative array. Don’t worry, we can still do it in C#.NET by utilizing dictionary. We have to use dictionary to keep the order of array element entry. If we use hashtable, the element order will be messed up. In this article, we will show you how dictionary can support the flexibility and expandability of PHP associative array.
Here is the Associative Array class code, you may save it to a single file
//By : Xhanch Studio
//URL : http://xhanch.com/
using System;
using System.Collections.Generic;
using System.Text;
using System.Collections.ObjectModel;
namespace AssociativeArray{
public class AssociativeArray{
public Dictionary<object, object> Item;
public AssociativeArray(){
this.Item = new Dictionary<object, object>();
}
public void Add(object name, object value){
this.Item.Add(name, value);
}
public void Add(object name, AssociativeArray value){
this.Item.Add(name, value.Item);
}
public Dictionary<object, object>.KeyCollection GetKeys(){
return this.Item.Keys;
}
public bool InArray(object hook){
return this.Item.ContainsKey(hook);
}
public int Count(){
return this.Item.Count;
}
public static bool IsAssociativeArray(){
return (this.Item.GetType().ToString().StartsWith("System.Collections.Generic.Dictionary"));
}
}
}
Here is how to use the Associative Array class:
using System;
using AssociativeArray;
namespace Test{
public class Test{
static void Main(string[] args){
AssociativeArray arr= new AssociativeArray();
arr.Add("elm 1", "value 1");
arr.Add("elm 2", true);
arr.Add("elm 3", 1);
//Add a sub array
AssociativeArray arrChd = new AssociativeArray();
arrChd .Add("chd 1", "value 1");
arrChd .Add("chd 2", true);
arrChd .Add("chd 3", 1);
arr.Add("elm 4", arrChd);
// List all AssociativeArray manually
foreach (string key in arr.GetKeys()){
//Check if the current element is an associative array
if(AssociativeArray.IsAssociativeArray(arr.Item[key])){
//Accessing sub array
AssociativeArray tmp = new AssociativeArray();
tmp.Item = arr.Item[key];
foreach (string key1 in tmp.GetKeys()){
Console.WriteLine(key1 + ": " + tmp.Item[key1 ]);
}
}else
Console.WriteLine(key + ": " + arr.Item[key]);
}
// Single Item
Console.WriteLine("User: " + arr.Item["Line 1"]);
}
}
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This method in the class :
public static bool IsAssociativeArray(){
return (this.Item.GetType().ToString().StartsWith(“System.Collections.Generic.Dictionary”));
}
Give me an error “Impossible use Keyword this in static method” !
When i try to do this in my program :
mp.Item = arr.Item[key];
Give me an error :
Cast Missing , Impossible convert object in ‘System.Collections.Generic.Dictionary’.
Why ?
Have you try to use this class ??
This class has been tested for sure since I have used it on some of my projects.
The error you get does not make sense.
FYI, this class is built under .NET FX 3.5.
Perhaps it is caused by incompatible version.