Create Indexers in C#
As we know arrays can be accessed by index. In the same way we can access any C# class members through index by using Indexers in C#.
Today we discussed about how to create Indexers in C# with simple example. Indexers in C# are almost same as lists in C#.
Create new console project CSharpIndexers in Microsoft Visual Studio.
Add new class Employee with get and set method. We access this class by using indexers in C# as shown below.
using System;
namespace CSharpIndexers
{
class Program
{
static void Main(string[] args)
{
Employee objEmp = new Employee();
//Add Employees
objEmp[0] = "A1";
objEmp[1] = "A2";
objEmp[2] = "A3";
objEmp[3] = "A4";
//Get EMployees
Console.WriteLine(objEmp[0]);
Console.WriteLine(objEmp[1]);
Console.WriteLine(objEmp[2]);
Console.WriteLine(objEmp[120]);
Console.ReadLine();
}
}
class Employee
{
string[] _names = new string[100];
public string this[int id]
{
get
{
if (id >= 0 && id < _names.Length)
{
return _names[id];
}
else
{
return "No Employee Found";
}
}
set
{
if (id >= 0 && id < _names.Length)
{
_names[id] = value;
}
}
}
}
}
As shown above in Employee class we created the indexer by using this operator. Run the application and output as below.
