Sample Entity Framework (EF) auditable records

EntyFrameworkAudit.cs

public class YourApplicationDbContextBase : DbContext
{
    //...

    public override int SaveChanges()
    {
        var changeSet = ChangeTracker.Entries<IAuditable>();
        if (changeSet != null)
            SetAuditDetails(changeSet);         

        return base.SaveChanges();
    }
    
    protected static void SetAuditDetails(IEnumerable<DbEntityEntry<IAuditable>> changeSet)
    {
        var utcNowAuditDate = DateTime.UtcNow;

        foreach (var dbEntityEntry in changeSet)
        {
            switch (dbEntityEntry.State)
            {
                case EntityState.Added:
                    dbEntityEntry.Entity.CreatedOn = utcNowAuditDate;
                    dbEntityEntry.Entity.ModifiedOn = utcNowAuditDate;
                    break;
                case EntityState.Modified:
                    dbEntityEntry.Entity.ModifiedOn = utcNowAuditDate;
                    break;
            }
        }
    }
    //...
}
public interface IAuditable
{
	DateTimeOffset CreatedOn { get; set; }
  DateTimeOffset ModifiedOn { get; set; }	
}

public class MyAuditableEntity : IAuditable
{
	  public Guid Id { get; set; }
	  //other properties
	  public DateTimeOffset CreatedOn { get; set; }
    public DateTimeOffset ModifiedOn { get; set; }	
}