FirstOrDefault in LINQ Query in Entity Framework Core

FirstOrDefault method will return the first item or return the default value (which is null in case the given type is a reference type) when there is no item from a database using Entity Framework Core.

using EntityFrameworkCore_ConsoleApp.Models;

namespace EntityFrameworkCore_ConsoleApp
{
    public class Program
    {
        static void Main(string[] args)
        {
            using (var databaseContext = new DatabaseContext())
            {
                var productInfo = (from product in databaseContext.Products
                                   select product).FirstOrDefault();
                Console.WriteLine("Id: " + productInfo.Id);
                Console.WriteLine("Name: " + productInfo.Name);
                Console.WriteLine("Price: " + productInfo.Price);
                Console.WriteLine("Quantity: " + productInfo.Quantity);
                Console.WriteLine("Description: " + productInfo.Description);
                Console.WriteLine("Status: " + productInfo.Status);
                Console.WriteLine("Photo: " + productInfo.Photo);
                Console.WriteLine("Created: " + productInfo.Created.ToString("dd/MM/yyyy"));
                Console.WriteLine("Category Id: " + productInfo.CategoryId);
            }
        }
    }
}

Output

Id: 9
Name: Tivi 1
Price: 10
Quantity: 15
Description: Description 1
Status: True
Photo: photo1.gif
Created: 20/10/2023
Category Id: 1

You can also add condition to FirstOrDefault method as below:

using EntityFrameworkCore_ConsoleApp.Models;

namespace EntityFrameworkCore_ConsoleApp
{
    public class Program
    {
        static void Main(string[] args)
        {
            using (var databaseContext = new DatabaseContext())
            {
                var productInfo = (from product in databaseContext.Products
                                   select product).FirstOrDefault(product => product.Status == false);
                Console.WriteLine("Id: " + productInfo.Id);
                Console.WriteLine("Name: " + productInfo.Name);
                Console.WriteLine("Price: " + productInfo.Price);
                Console.WriteLine("Quantity: " + productInfo.Quantity);
                Console.WriteLine("Description: " + productInfo.Description);
                Console.WriteLine("Status: " + productInfo.Status);
                Console.WriteLine("Photo: " + productInfo.Photo);
                Console.WriteLine("Created: " + productInfo.Created.ToString("dd/MM/yyyy"));
                Console.WriteLine("Category Id: " + productInfo.CategoryId);
            }
        }
    }
}

Output

Id: 10
Name: Tivi 2
Price: 5
Quantity: 22
Description: Description 2
Status: False
Photo: photo2.gif
Created: 20/04/2022
Category Id: 1

You can use combination of FirstOrDefault method and Where as below:

using EntityFrameworkCore_ConsoleApp.Models;

namespace EntityFrameworkCore_ConsoleApp
{
    public class Program
    {
        static void Main(string[] args)
        {
            using (var databaseContext = new DatabaseContext())
            {
                var productInfo = (from product in databaseContext.Products
                                   where product.Status == true 
                                   select product).FirstOrDefault();
                Console.WriteLine("Id: " + productInfo.Id);
                Console.WriteLine("Name: " + productInfo.Name);
                Console.WriteLine("Price: " + productInfo.Price);
                Console.WriteLine("Quantity: " + productInfo.Quantity);
                Console.WriteLine("Description: " + productInfo.Description);
                Console.WriteLine("Status: " + productInfo.Status);
                Console.WriteLine("Photo: " + productInfo.Photo);
                Console.WriteLine("Created: " + productInfo.Created.ToString("dd/MM/yyyy"));
                Console.WriteLine("Category Id: " + productInfo.CategoryId);
            }
        }
    }
}

Output

Id: 9
Name: Tivi 1
Price: 10
Quantity: 15
Description: Description 1
Status: True
Photo: photo1.gif
Created: 20/10/2023
Category Id: 1

You can use combination of FirstOrDefault method and Where and OrderBy as below:

using EntityFrameworkCore_ConsoleApp.Models;

namespace EntityFrameworkCore_ConsoleApp
{
    public class Program
    {
        static void Main(string[] args)
        {
            using (var databaseContext = new DatabaseContext())
            {
                var productInfo = (from product in databaseContext.Products
                                   where product.Status == true 
                                   orderby product.Price
                                   select product).FirstOrDefault();
                Console.WriteLine("Id: " + productInfo.Id);
                Console.WriteLine("Name: " + productInfo.Name);
                Console.WriteLine("Price: " + productInfo.Price);
                Console.WriteLine("Quantity: " + productInfo.Quantity);
                Console.WriteLine("Description: " + productInfo.Description);
                Console.WriteLine("Status: " + productInfo.Status);
                Console.WriteLine("Photo: " + productInfo.Photo);
                Console.WriteLine("Created: " + productInfo.Created.ToString("dd/MM/yyyy"));
                Console.WriteLine("Category Id: " + productInfo.CategoryId);
            }
        }
    }
}

Output

Id: 9
Name: Tivi 1
Price: 10
Quantity: 15
Description: Description 1
Status: True
Photo: photo1.gif
Created: 20/10/2023
Category Id: 1

You can use combination of FirstOrDefault method and Where and OrderBy and Select as below:

using EntityFrameworkCore_ConsoleApp.Models;

namespace EntityFrameworkCore_ConsoleApp
{
    public class Program
    {
        static void Main(string[] args)
        {
            using (var databaseContext = new DatabaseContext())
            {
                var productInfo = (from product in databaseContext.Products
                                   where product.Status == true
                                   orderby product.Price
                                   select new
                                   {
                                       Id = product.Id,
                                       Name = product.Name,
                                       Price = product.Price
                                   }).FirstOrDefault();
                Console.WriteLine("Id: " + productInfo.Id);
                Console.WriteLine("Name: " + productInfo.Name);
                Console.WriteLine("Price: " + productInfo.Price);
            }
        }
    }
}

Output

Id: 9
Name: Tivi 1
Price: 10