// 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

            // Saving audit trail in a database

            this.Configuration.Audit.AutoSaveSet = this.XmlAuditEntries;

            this.Configuration.Audit.IsEnabled = true;

        }

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

        public DbSet<XmlAuditEntry> XmlAuditEntries { get; set; }

    }

    public static void Main()

    {

        // Many changes

        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" });

            // Save changes and Audit trail in database

            context.SaveChanges();

        }

        using (var context = new EntityContext())

        {

            var customers = context.Customers.ToList();

            context.Customers.Remove(customers.Where(x => x.Name == "Customer_B").First());

            customers.Where(x => x.Name == "Customer_A").First().Description = "updated";

            // Save changes and Audit trail in database

            context.SaveChanges();

        }

        // Display

        using (var context = new EntityContext())

        {

            // Displaying audit trail history

            var auditEntries = context.XmlAuditEntries.ToAuditEntries();

            FiddleHelper.WriteTable("1 - Audit Entries", auditEntries);

            FiddleHelper.WriteTable("2 - Audit Properties", auditEntries.SelectMany(x => x.Properties));

        }

    }

    public class Customer

    {

        public int CustomerID { get; set; }

        public string Name { get; set; }

        public string Description { get; set; }

    }

}