EF Classic - Bulk Insert - Real Life Scenarios - Bulk Insert specific column (EF Core)

CSharp · Console

/Program.cs

// Entity Framework Classic
// Doc: https://entityframework-classic.net/bulk-insert

// @nuget: Z.EntityFramework.Classic

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Data.Entity;

public class Program
{
	public static void Main()
	{
		var customers = GenerateCustomers(10);
		
		using (var context = new EntityContext())
		{
			FiddleHelper.WriteTable("1 - Customers Before", context.Customers);
			
			context.BulkInsert(customers, options => {
				options.ColumnInputExpression = x => new { x.Code, x.CreatedDate };
			});
			
			FiddleHelper.WriteTable("2 - Customers After", context.Customers);
		}		
	}

	public static List<Customer> GenerateCustomers(int count)
	{
		var customers = new List<Customer>();
		
		for(int i = 0; i < count; i++)
		{
			customers.Add(new Customer() { Code = "Inserted_" + i, Name = "Skipped_" + i, CreatedDate = DateTime.Now, ModifiedDate = DateTime.Now });
		}
		
		return customers;
	}

	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 Code { get; set; }
		public string Name { get; set; }
		public DateTime? CreatedDate { get; set; }
		public DateTime? ModifiedDate { get; set; }
	}
}