If using EF6’s DbContext
you can use ChangeTracker
in SaveChanges
override to find added/modified entities of custom type, for example IAuditedEntity.
public interface IAuditedEntity {
string CreatedBy { get; set; }
DateTime CreatedAt { get; set; }
string LastModifiedBy { get; set; }
DateTime LastModifiedAt { get; set; }
}
public override int SaveChanges() {
var addedAuditedEntities = ChangeTracker.Entries<IAuditedEntity>()
.Where(p => p.State == EntityState.Added)
.Select(p => p.Entity);
var modifiedAuditedEntities = ChangeTracker.Entries<IAuditedEntity>()
.Where(p => p.State == EntityState.Modified)
.Select(p => p.Entity);
var now = DateTime.UtcNow;
foreach (var added in addedAuditedEntities) {
added.CreatedAt = now;
added.LastModifiedAt = now;
}
foreach (var modified in modifiedAuditedEntities) {
modified.LastModifiedAt = now;
}
return base.SaveChanges();
}