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Track Created and Modified Fields Automatically with Entity Framework Code First

21-01-2019
using System;
using System.Data.Entity;
using System.Data.Entity.Core.Objects;
using System.Data.Entity.Infrastructure;
using System.Data.Entity.ModelConfiguration.Conventions;
using System.Diagnostics;
using System.Linq;
using System.Reflection;
using System.Web;
using log4net;
using TelifBandrolTutanak.Models;

namespace TelifBandrolTutanak.DAL
{
    public class BandrolContext : DbContext
    {
        private readonly ILog _logger = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
        
        public BandrolContext() : base("BandrolContext")
        {
            Database.Log = log => _logger.Debug(log);
        }
        
        public  DbSet<User> Users { get; set; }
        
        
        public override int SaveChanges()
        {
            AddUserCreatedAndModified();
            /*var changed = ChangeTracker.Entries();
            if (changed != null)
            {
                foreach (var entry in changed.Where(e => e.State == EntityState.Deleted))
                {
                    entry.State = EntityState.Unchanged;
                    if (entry.Entity is ISoftDeletable)
                    {
                        ((Base)entry.Entity).DeletedAt=DateTime.Now;
                    }
                }
            }
            */
            return base.SaveChanges();
        }
        
        private void AddUserCreatedAndModified()
        {
            var entities = ChangeTracker.Entries().Where(x =>
            x.Entity is Base && (x.State == EntityState.Added || x.State == EntityState.Modified));
            
            var currentUsername = !string.IsNullOrEmpty(HttpContext.Current?.User?.Identity?.Name)
            ? HttpContext.Current.User.Identity.Name
            : "Anonymous";
            
            foreach (var entity in entities)
            {
                if (entity.State == EntityState.Added)
                {
                    ((Base) entity.Entity).CreatedAt = DateTime.Now;
                    ((Base) entity.Entity).UserCreated = currentUsername;
                }
                else
                {
                    if(entity.OriginalValues["CreatedAt"]!=null) ((Base) entity.Entity).CreatedAt = (DateTime) entity.OriginalValues["CreatedAt"];
                    if (entity.OriginalValues["UserCreated"]!=null)  ((Base) entity.Entity).UserCreated = (string) entity.OriginalValues["UserCreated"];
                }
                
                ((Base) entity.Entity).UpdatedAt = DateTime.Now;
                ((Base) entity.Entity).UserModified = currentUsername;
            }
        }
        
        protected override void OnModelCreating(DbModelBuilder modelBuilder)
        {
            Database.Log = s => Debug.WriteLine(s);
            modelBuilder.Conventions.Remove<OneToManyCascadeDeleteConvention>();
        }
        
        public ObjectSet<TEntity> CreateObjectSet<TEntity>() where TEntity : class
        {
            var context = ((IObjectContextAdapter) this).ObjectContext;
            return context.CreateObjectSet<TEntity>();
        }
    }
}

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