// 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

            // Format DBNull.Value as 'null' value. True by default.

            this.Configuration.Audit.DisplayDBNullAsNull(false);

            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()

    {

        using (var context = new EntityContext())

        {

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

            // Save changes with Audit Enabled

            context.SaveChanges();

            // Display Audit Trail

            FiddleHelper.WriteTable("Entity Framework - Audit Trail", context.XmlAuditEntries.ToList().ToAuditEntries().SelectMany(x => x.Properties));

            context.Configuration.Audit.DisplayDBNullAsNull(true);

            FiddleHelper.WriteTable("Entity Framework - Audit Trail", context.XmlAuditEntries.ToList().ToAuditEntries().SelectMany(x => x.Properties));

        }

    }

    public class Customer

    {

        public int CustomerID { get; set; }

        public string Name { get; set; }

        public string Description { get; set; }

    }

}