Sum Method in LINQ MeThods in Entity Framework Core

Sum method is used to used to calculate the total or sum of any numeric column in database.

using EntityFrameworkCore_ConsoleApp.Models;

namespace EntityFrameworkCore_ConsoleApp
{
    public class Program
    {
        static void Main(string[] args)
        {
            using (var databaseContext = new DatabaseContext())
            {
                var sum = databaseContext.Products.Sum(product => product.Quantity);
                Console.WriteLine("Sum: " + sum);
            }
        }
    }
}

Output

Sum: 146

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

using EntityFrameworkCore_ConsoleApp.Models;

namespace EntityFrameworkCore_ConsoleApp
{
    public class Program
    {
        static void Main(string[] args)
        {
            using (var databaseContext = new DatabaseContext())
            {
                var sum = databaseContext.Products.Where(product => product.Status == true).Sum(product => product.Quantity);
                Console.WriteLine("Sum: " + sum);
            }
        }
    }
}

Output

Sum: 83

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

using EntityFrameworkCore_ConsoleApp.Models;

namespace EntityFrameworkCore_ConsoleApp
{
    public class Program
    {
        static void Main(string[] args)
        {
            using (var databaseContext = new DatabaseContext())
            {
                var sum = databaseContext.Products.Where(product => product.Status == true).Select(product => product.Quantity).Sum();
                Console.WriteLine("Sum: " + sum);
            }
        }
    }
}

Output

Sum: 83

You can also do the sum of an expression with multiple columns as below:

using EntityFrameworkCore_ConsoleApp.Models;

namespace EntityFrameworkCore_ConsoleApp
{
    public class Program
    {
        static void Main(string[] args)
        {
            using (var databaseContext = new DatabaseContext())
            {
                var sum = databaseContext.Products.Where(product => product.Status == true).Sum(product => product.Price * product.Quantity);
                Console.WriteLine("Sum: " + sum);
            }
        }
    }
}

Output

Sum: 1310