// 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 Z.EntityFramework.Classic;

​

public class Program

{

    public class EntityContext : DbContext

    {

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

        {

            // Add your configuration here

            this.Configuration.Audit.AutoSaveSet = this.AuditEntries;

            this.Configuration.Audit.IsEnabled = true;

        }

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

        public DbSet<AuditEntry> AuditEntries { get; set; }

        public DbSet<AuditEntryProperty> AuditEntryProperty { get; set; }

    }

    public static void Main()

    {

        using (var context = new EntityContext())

        {

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

            // Save changes with Audit Enabled

            context.SaveChanges();

        }

        using (var context = new EntityContext())

        {

            context.Customers.ToList().ForEach(x => x.Description = "Update");

            // Save changes with Audit Enabled

            context.SaveChanges();

            var audit = context.Configuration.Audit.LastAudit;

            // Display Audit Trail

            FiddleHelper.WriteTable("Entity Framework - OldValueRaw from AuditEntryProperty",audit.Entries.First().Properties.Select(x => x.OldValueRaw).ToList());

        }

    }

    public class Customer

    {

        public int CustomerID { get; set; }

        public string Name { get; set; }

        public string Description { get; set; }

    }

}