EF.Plus - Query Deferred - Query Deferred 3 (EF Core)

CSharp · Console

/Program.cs

// Entity Framework Plus
// Doc: https://entityframework-plus.net/query-deferred

// @nuget: Microsoft.EntityFrameworkCore.SqlServer
// @nuget: Z.EntityFramework.Plus.EFCore

using System;
using System.Linq;
using Z.EntityFramework.Plus;
using Microsoft.EntityFrameworkCore;
using Microsoft.Data.SqlClient;

public class Program
{
	public static void Main()
	{
		using (var context = new EntityContext())
		{
			context.Database.EnsureCreated();
		}
		
		GenerateData();
		
		using (var context = new EntityContext())
		{	
			// Query Cache
			context.Customers.DeferredCount().FromCache();

			// Query Future
			context.Customers.DeferredCount().FutureValue();
			
			// ADD CODE HERE
		}
	}
		 
	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() 
		{
		}

		protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
		{
			optionsBuilder.UseSqlServer(new SqlConnection(FiddleHelper.GetConnectionStringSqlServer()));

			base.OnConfiguring(optionsBuilder);
		}
		
		public DbSet<Customer> Customers { get; set; }
	}
	
	
	public class Customer
	{
		public int CustomerID { get; set; }
		public string Name { get; set; }
		public Boolean IsActive { get; set; }
	}
}