// Entity Framework Plus

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

​

// @nuget: Microsoft.EntityFrameworkCore

// @nuget: Microsoft.EntityFrameworkCore.SqlServer

// @nuget: Z.EntityFramework.Extensions.EFCore

// @nuget: Z.EntityFramework.Plus.EFCore

​

using System;

using System.Linq;

using Microsoft.EntityFrameworkCore;

using System.Collections.Generic;

using Microsoft.Data.SqlClient;

using Z.EntityFramework.Plus;

​

public class Program

{

    public static void Main()

    {

        using (var context = new EntityContext())

        {

            context.Database.EnsureCreated();

        }

        GenerateData();     

​

        // Audit : Easily tracks changes, exclude/include entity or property and auto save audit entries in the database.

        using (var context = new EntityContext())

        {

            var listToRemove = context.Customers.Where(x => x.IsActive == false ).ToList();

            var listToModify = context.Customers.Where(x => x.IsActive == true ).ToList();

            var listToAdd = new List<Customer>() { new Customer() { Name = "Customer_C", Description = "Description", IsActive = false}};

            context.Customers.AddRange(listToAdd); // add

            context.Customers.RemoveRange(listToRemove); // remove

            listToModify.First().Description = "Updated_A"; // modify

            // Audit + Entity Framework Extensions: If you are using Entity Framework Extensions, it is still possible to use the EF+ Audit features. 

            // However, it will only works with BulkSaveChanges.

            context.BulkSaveChangesWithAudit();

        }

        using (var context = new EntityContext())

        {

            FiddleHelper.WriteTable("All Entry",context.AuditEntries.ToList());

            foreach(var entry in context.AuditEntries.ToList())

            {

                FiddleHelper.WriteTable("Properties for Entry ID: " + entry.AuditEntryID,context.AuditEntryProperties.Where(x => x.AuditEntryID == entry.AuditEntryID).ToList());

            }

        }

    }

    public static void GenerateData()

    {

        using (var context = new EntityContext())

        {

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

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

            context.BulkSaveChanges();  

        }

    }

​

    public class EntityContext : DbContext

    {

        public EntityContext() 

        {

        }

​

        protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)

        {

            optionsBuilder.UseSqlServer(new SqlConnection(FiddleHelper.GetConnectionStringSqlServer()));

​

            base.OnConfiguring(optionsBuilder);

        }

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

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

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

​

        public void BulkSaveChangesWithAudit()

        {

            var audit = new Audit();

            audit.PreSaveChanges(this);

            this.BulkSaveChanges();

            audit.PostSaveChanges();

            if (audit.Entries.Count > 0)

            {

                this.BulkInsert(audit.Entries);

                // The ID must be set, there is currently no navigation properties in the AuditEntryProperty class

                audit.Entries.ForEach(x => x.Properties.ForEach(y => y.AuditEntryID = x.AuditEntryID));

                // Don't output the Id for EntryProperty for more performance

                this.BulkInsert(audit.Entries.SelectMany(y => y.Properties), operation =>

                {

                    operation.AutoMapOutputDirection = false;

                    operation.BatchSize = 50000;

                });

            }

        }

        static EntityContext()

        {

            AuditManager.DefaultConfiguration.AutoSavePreAction = (context, audit) =>

                // ADD "Where(x => x.AuditEntryID == 0)" to allow multiple SaveChanges with same Audit

                (context as EntityContext).AuditEntries.AddRange(audit.Entries);

       }

    } 

    public class Customer

    {

        public int CustomerID { get; set; }

        public string Name { get; set; }

        public string Description { get; set; }

        public Boolean IsActive { get; set; }

    }

}