Create extension method

[Inlustris]

I'm trying to create an override for the BulkInsert function. In my dbcontext I use an override on SaveChanges() where i edit several properties of the object and return the base.SaveChanges();

Is it possible to create this for the bulklinsert?

[borisdj]

BulkOps are not calling SaveChanges() method so overriding it won't have any effect.
You could override extension methods, I use that for setting AuditInfo.
Example:

public static class MyContextBulkExtensions
{
    public static Task BulkInsertAsync<T>(this CoreContext context, IList<T> entities, BulkConfig bulkConfig = null, Action<decimal> progress = null) where T : class
    {
        context.SetAuditInfo<T>(entities);
        return ((DbContext)context).BulkInsertAsync(entities, bulkConfig, progress);
    }

    public static Task BulkUpdateAsync<T>(this CoreContext context, IList<T> entities, IList<T> previousEntities, BulkConfig bulkConfig = null, Action<decimal> progress = null) where T : class
    {
        context.SetAuditInfo<T>(entities, previousEntities);
        return ((DbContext)context).BulkUpdateAsync(entities, bulkConfig, progress);
    }
}

SaveChanges that is called when regular EF is used, has it's own logic for setting AuditInfo.
For example on Update SaveChanges is using ChangeTracker modified Entries and Metadata Property.OriginalValue, that's something Bulk methods don't have because there changes are not tracked, so you have to do it kinda manually if you want all the changes.
But for just setting TimeStamp and CreatedBy, logic is the same as would be in SaveChanges(), so you could have a shared method for this.

[Inlustris]

Hi Borisdj

Thank you for your information. With those statics i can set the properties i want to set before the items get saved to the database.

The change tracking in EF is indeed a problem that's why i started using EFCore.BulkExtensions.