Asp.Net MVC keep logs for CRUD functions - asp.net-mvc

Question

In my mvc application i have a base model as below
namespace ModulericaV1.Models
{
public class BaseModel
{
private ApplicationDbContext db = new ApplicationDbContext();
public DateTime? CrDate { get; set; }
[ForeignKey("CrUser")]
public ApplicationUser UserCr { get; set; }
public string CrUser { get; set; }
public DateTime? MdDate { get; set; }
[ForeignKey("MdUser")]
public ApplicationUser UserMd { get; set; }
public string MdUser { get; set; }
public bool IsDeleted { get; set; }
public ApplicationUser GetUserObject(string id)
{
var UserObject = db.Users.Find(id);
return UserObject;
}
public void LogBasic()
{
if (this.CrDate == null)
{
this.CrDate = System.DateTime.Now;
this.CrUser = HttpContext.Current.User.Identity.GetUserId();
}
else
{
this.MdDate = System.DateTime.Now;
this.MdUser = HttpContext.Current.User.Identity.GetUserId();
}
}
}
}
All my models inherits the :BaseModel. What i am trying to do, calling LogBasic() method for all Create and Update DB queries so i can log which user create new row or made changes.
Where is the place should i need to call LogBasic() method .

Answer 1

Probably something like this should work:
public class ApplicationDbContext : DbContext {
// ...
public override int SaveChanges () {
if(HasChanges()){
foreach(var entry in Entries<BaseModel>()){
((BaseModel)entry.Entity).LogBasic();
}
}
}
// ...
}

Answer 2

The best place to do this is in the ApplicationDbContext on the SaveChanges() method. You can iterate through all of the items that are pending updates and then if they are of a BaseModel, log them.
I don't have the exact syntax to hand, but this is the idea:
public class ApplicationDbContext : DbContext
{
//.....
public override int SaveChanges()
{
foreach(var entity in this.ChangeTracker.Entries)
{
var baseModel = entity as BaseModel;
if(baseModel!=null)
{
switch(entity.State)
{
case State.Modified;
// Do things with an updated version
case State.Deleted:
// Do things with the deleted version
case State.Added:
{
// Do things with the Added entity
baseModel.LogBasic();
break;
}
}
}
base.SaveChanges();
}
}