C# | Check if an array object is equal to another array object

Last Updated : 23 Jan, 2019

An array is a group of like-typed variables that are referred to by a common name. And each data item is called an element of the array. Equals(Object) method which is inherited by Array class from object class is used to check whether an array is equal to another array 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:

// C# code to check if a Array is
// equal to other Array or not
using System;
  
namespace geeksforgeeks {
  
class GFG {
  
    // Main Method
    public static void Main()
    {
  
        // Two-dimensional array
        int[, ] intarray = new int[, ] { { 1, 2 },
                                         { 3, 4 },
                                         { 5, 6 },
                                         { 7, 8 } };
  
        // check if intarray is
        // equal to itself or not
        Console.WriteLine(intarray.Equals(intarray));
    }
}
}

Output:

True

Example 2:

// C# code to check if an Array is
// equal to other Array or not
using System;
  
namespace geeksforgeeks {
  
class GFG {
  
    // Main Method
    public static void Main()
    {
  
      
        // Creating and intializing new the String
        String[] arr1 = new String[4] { "Sun", "Mon", "Tue", "Thu" };
          
          
        // taking anotther array
        String[] arr2 = new String[4] { "Sun", "Mon", "Tue", "Thu" };
          
  
        // check if arr1 is
        // equal to arr2 or not
        Console.WriteLine(arr1.Equals(arr2));
          
        // assigning arr1 reference to arr3
        String[] arr3 = new String[4];
        arr3 = arr1;
          
        // check if arr2 is
        // equal to arr3 or not
        Console.WriteLine(arr2.Equals(arr3));
          
        // check if arr1 is
        // equal to arr3 or not
        // it will return true as both 
        // array object refer to same
        Console.WriteLine(arr1.Equals(arr3));
          
    }
}
}

Output:

False
False
True

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

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