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What is Indexer?

Topic Name Introduction to C# Environment Setup C# Keywords Contextual Keywords C# Namespaces What Is Class? What is Object? Data Types Nullable Types C# Variables What are Access Modifiers? What is Property? What is Indexer? Hello world Program What is Type conversion? What is if else condition? What is Array? What is Jagged Array? What is ArrayList? What is List? What is string and StringBuilder? What is for loop? What is foreach loop? What is switch? What is Method? What is method overloading? What is Constructor? What is constructor overloading? What is Boxing and Unboxing? What is delegate in C# and uses of delegates? What is Inheritance? What are Value types and Reference types? What is Exception Handling? What is struct? What is Dictionary? What is Hashtable? What is interface? What is Abstraction? What is Polymorphism? What is Enums? What is Sealed Class? What is Partial Class? Extension Methods? What is static? What is Encapsulation? Difference between Equality Operator (==) and Equals() Method in C# ? What is IEnumerable? What is Serializing? What is LINQ? Differences between IEnumerable and IQueryable? What is Multithreading? What is File Handling? What is late binding and early binding? What is Singleton Design Patterns?
1/7/2020 7:02:24 AM

In C# introduce new concept is indexer. This is very useful some situation. Indexers allow our object to be used just like an array, or we can index the object using [] brackets just like array. We can say indexers are special type of property’s which adds logic that how can array or list store the values. Syntax of the indexers resembles to properties. We can use all access modifiers with indexers and also have return types. We can say indexers are regular members of a class. Indexers are use this keyword. Given bellow the example code:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ObjectTest
{
    class Student
    {
        private int[] myArr = new int[5];
        public int this[int ind]
        {
            get { return myArr[ind]; }
            set { myArr[ind] = value; }
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            Student stdObj = new Student();
            stdObj[0] = 5;
            Console.WriteLine("Value is Assign : "+ stdObj[0]);
            Console.ReadKey();
        }
    }
}

In this code we use an int array and this array is private so we can’t access from another class. So, we use indexer to get and set value from another class. This indexer is public so we can access another class. Indexer can be overload.

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