Indexing with an Integer Indexer : Indexer « Class « C# / CSharp Tutorial

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C# / CSharp Tutorial » Class » Indexer 
7. 40. 2. Indexing with an Integer Indexer
  1. It is possible to overload the [ ] operator for classes that you create with an indexer.
  2. An indexer allows an object to be indexed like an array.
 

using System;
using System.Collections;

class Pair
{
    public Pair(string name, object data)
    {
        this.name = name;
        this.data = data;
    }
    public string Name
    {
        get
        {
            return(name);
        }
        set
        {
            name = value;
        }
    }
    public object Data
    {
        get
        {
            return(data);
        }
        set
        {
            data = value;
        }
    }
    string    name;
    object data;
}
class PairList
{
    public PairList()
    {
        row = new ArrayList();
    }
    
    public void Load() 
    {
        /* load code here */ 
        row.Add(new Pair("A"5551212));
        row.Add(new Pair("B""Fred"));
        row.Add(new Pair("C"2355.23m));
    }
    
    // the indexer
    public Pair this[int column]
    {
        get
        {
            return((Pairrow[column - 1]);
        }
        set
        {
            row[column - 1= value;
        }
    }
    ArrayList    row;    
}
class MainClass
{
    public static void Main()
    {
        PairList row = new PairList();
        row.Load();
        Console.WriteLine("Column 0: {0}", row[1].Data);
        row[1].Data = 12;    
    }
}

        
Column 0: 5551212
  
7. 40. Indexer
7. 40. 1. Creating One-Dimensional Indexers
7. 40. 2. Indexing with an Integer Indexer
7. 40. 3. Indexing with an String Indexer
7. 40. 4. Indexing with Multiple Parameters
7. 40. 5. Define both int and string indexer for a class
7. 40. 6. Use indexer to add element
7. 40. 7. Define getter only indexer
7. 40. 8. Use an indexer to create a fail-soft array.
7. 40. 9. Overload the MyArray indexer
7. 40. 10. Indexers don't have to operate on actual arrays
7. 40. 11. Indexer based on 0 or non-zero
7. 40. 12. Indexer based on switch statement
7. 40. 13. Indexer for generic type
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