C# | Check if two List objects are equal

Last Updated : 27 Jan, 2019

Equals(Object) Method which is inherited from the Object class is used to check if a specified List<T> object is equal to another List<T> object or not. Syntax:

public virtual bool Equals (object obj);

Here, obj is the object which is to be compared with the current object. Return Value: This method return true if the specified object is equal to the current object otherwise it returns false. Below programs illustrate the use of above-discussed method: Example 1:

CSharp

// C# program to if a List object
// is equal to another List object
using System;
using System.Collections.Generic;

class Geeks {

    // Main Method
    public static void Main(String[] args)
    {

        // Creating an List<T> of Integers
        List<int> firstlist = new List<int>();

        // Adding elements to List
        firstlist.Add(17);
        firstlist.Add(19);
        firstlist.Add(21);
        firstlist.Add(9);
        firstlist.Add(75);
        firstlist.Add(19);
        firstlist.Add(73);

        // Checking whether firstlist is
        // equal to itself or not
        Console.WriteLine(firstlist.Equals(firstlist));
    }
}

Output:

True

Example 2:

CSharp

// C# program to if a List object
// is equal to another List object
using System;
using System.Collections.Generic;

class Geeks {

    // Main Method
    public static void Main(String[] args)
    {

        // Creating a List of strings
        List<string> list1 = new List<string>();

        // Inserting elements in List
        list1.Add("DS");
        list1.Add("C++");
        list1.Add("Java");
        list1.Add("JavaScript");

        // Creating an List<T> of Integers
        List<int> list2 = new List<int>();

        // Adding elements to List
        list2.Add(78);
        list2.Add(44);
        list2.Add(27);
        list2.Add(98);
        list2.Add(74);

        // Checking whether list1 is
        // equal to list2 or not
        Console.WriteLine(list1.Equals(list2));

        // Creating a List of integers
        List<int> list3 = new List<int>();

        // Assigning list2 to list3
        list3 = list2;

        // Checking whether list3 is
        // equal to list2 or not
        Console.WriteLine(list3.Equals(list2));
    }
}

Output:

False
True

Note: If the current instance is a reference type, the Equals(Object) method checks for reference equality.

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Kirti_Mangal

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