LINQ DefaultfEmpty() Method

In LINQ, DefaultfEmpty() method is used to return the default value in that case if the list/collection contains the null or empty value; otherwise, it will return the element from the sequence in the collection.

Syntax of using the LINQ DefaultfEmpty() method to get the list of the elements when the list returns an empty or null value.

From the above syntax, we are getting the list of items using the LINQ DefaultfEmpty method.

Example of LINQ DefaultfEmpty() Method

Here is the example of the LINQ DefaultfEmpty() method to get the elements from the list or return the value when we not found any element in the list/collection.

using System;
using System. Collections;
using System.Collections.Generic;
using System. Linq;
using System. Text;
using System.Threading.Tasks;
namespace ConsoleApp1
{
    class Programme2
    {
        static void Main(string[] args)
        {   
         //create an array 'b'        
            int[] b = { };
            int[] a = { 1, 2, 3, 4, 5 };
//with the help of DefaultfEmpty try to fetch the value from both of the list
            var result = a.DefaultIfEmpty();
            var result1 = b.DefaultIfEmpty();
            Console.WriteLine("----List1 with Values----");
//with the help of foreach loop we will print the value of 'result' variable 
            foreach (var val1 in result)
            {
                Console.WriteLine(val1);
            }
                Console.WriteLine("---List2 without Values---");
//with the help of foreach loop we will print the value of 'result1' variable 
            foreach (var val2 in result1)
            {
                Console.WriteLine(val2);
            }
                Console.ReadLine();
            }
    }
}

In the above example, we have two lists a and b, and we are trying to get the elements from these two lists using LINQ DefaultfEmpty() method.

Output: