EF Core: Built in Created and Edited timestamps [duplicate] - entity-framework

Question

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How to add the same column to all entities in EF Core?
(2 answers)
Closed 2 years ago.
The title is quite self-explanatory. Is there a built-in mechanism to support Created and Edited timestamps on records in a code-first database in Entity Framework Core?
Something like :created_at and :updated_at in Ruby on Rails migrations. I could not find any documentation concerning this. If no out-of-the-box mechanism is present, is there a best practice how to implement those columns?

Answer 1

The non EF Core solutions don't apply to EF Core without some amount of rework. I wanted to allow certain entities to have CreatedAt and LastModified timestamps that updated in a reasonably automated way. This is what I ended up doing.
Defined an interface - ITimeStampedModel that my models could inherit from that required them to have the timestamps I wanted:
public interface ITimeStampedModel
{
DateTime CreatedAt {get; set;}
DateTime LastModified {get; set;}
}
Override SaveChanges on my DbContext to look for new or modified models, and update their timestamps appropriately:
public override int SaveChanges()
{
var newEntities = this.ChangeTracker.Entries()
.Where(
x => x.State == EntityState.Added &&
x.Entity != null &&
x.Entity as ITimeStampedModel != null
)
.Select(x => x.Entity as ITimeStampedModel);
var modifiedEntities = this.ChangeTracker.Entries()
.Where(
x => x.State == EntityState.Modified &&
x.Entity != null &&
x.Entity as ITimeStampedModel != null
)
.Select(x => x.Entity as ITimeStampedModel);
foreach (var newEntity in newEntities)
{
newEntity.CreatedAt = DateTime.UtcNow;
newEntity.LastModified = DateTime.UtcNow;
}
foreach (var modifiedEntity in modifiedEntities)
{
modifiedEntity.LastModified = DateTime.UtcNow;
}
return base.SaveChanges();
}
Anyone have a better solution?