// Entity Framework Plus

// Doc: https://entityframework-plus.net/query-deferred

​

// @nuget: EntityFramework

// @nuget: Z.EntityFramework.Plus.EF6

​

using System;

using System.Data;

using System.Collections.Generic;

using System.Linq;

using System.Data.Entity;

using Z.EntityFramework.Plus;

​

public class Program

{

    public static void Main()

    {   

        GenerateData();

        using (var context = new EntityContext())

        {

            var countDeferred = context.Customers.DeferredCount();

            var taskCount = countDeferred.ExecuteAsync();

        }

    }

    public static void GenerateData()

    {

        using (var context = new EntityContext())

        {

            context.Customers.Add(new Customer() { Name ="Customer_A", IsActive = false  });

            context.Customers.Add(new Customer() { Name ="Customer_B", IsActive = true });

            context.Customers.Add(new Customer() { Name ="Customer_C", IsActive = false });

​

            context.SaveChanges();  

        }

    }

​

    public class EntityContext : DbContext

    {

        public EntityContext() : base(FiddleHelper.GetConnectionStringSqlServer())

        {

​

        }

        public DbSet<Customer> Customers { get; set; }

    }

    public class Customer

    {

        public int CustomerID { get; set; }

        public string Name { get; set; }

        public Boolean IsActive { get; set; }

    }

}