// Entity Framework Classic

// Doc: https://entityframework-classic.net/audit

​

// @nuget: Z.EntityFramework.Classic

​

using System;

using System.Linq;

using System.Collections.Generic;

using System.Data.Entity;

using System.Text;

using Z.EntityFramework.Classic;

​

public class Program

{

    public class EntityContext : DbContext

    {

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

        {

            // Add your configuration here

            this.Configuration.Audit.AutoSaveAction = (context,auditing) => {

                using (System.IO.StreamWriter file = 

            new System.IO.StreamWriter(@"Log.txt"))

            {

                    foreach(var entry in auditing.EntriesXml)

                    {

                        file.WriteLine("EntitySetName: " + entry.EntitySetName);

                        file.WriteLine("EntityTypeName: " + entry.EntityTypeName);

                        file.WriteLine("State: " + entry.State);

                        file.WriteLine("StateName: " + entry.StateName);

                        file.WriteLine("CreatedBy: " + entry.CreatedBy);

                        file.WriteLine("CreatedDate: " + entry.CreatedDate);

                        file.WriteLine("XmlProperties: ");

                        file.WriteLine(entry.XmlProperties);

                        file.WriteLine("---");

                        file.WriteLine("---");

                        file.WriteLine("---");

                    }   

                }

            };

            this.Configuration.Audit.IsEnabled = true;

        }

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

    }

    public static void Main()

    {

        using (var context = new EntityContext())

        {

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

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

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

            // Save changes with Audit Enabled

            context.SaveChanges();

        }

        // Display Audit Trail in the Log.txt

        string[] lines = System.IO.File.ReadAllLines(@"Log.txt");

        foreach (string line in lines)

        {

            Console.WriteLine(line);

        }

    }

​

    public class Customer

    {

        public int CustomerID { get; set; }

        public string Name { get; set; }

        public string Description { get; set; }

    }

}