EFCore.BulkExtensions How to update records on condition?

Question

I am using EFCore.BulkExtensions for insert and update records in a table. But I have a problem with update records on condition.

For example, I have 15 records (10 to insert, 5 to update). I need to insert 10, but update only 2, because 3 records have old value in UpdatedAt property (database contains more recent data).

If I use EFCore.BulkExtensions like this:

_dbContext.BulkInsertOrUpdateAsync(entitiesList, _bulkConfig);

10 records will be inserted and 5 records will be updated. So the data in the database will be updated by older ones.

To solve my problem I want something like this:

_dbContext.BulkInsertOrUpdateAsync(entitiesList, _bulkConfig,
    (oldRecord, newRecord) => newRecord.UpdatedAt > oldRecord.UpdatedAt);

Can you suggest some efficient way to solve this problem with EFCore.BulkExtensions?

Answer 1

This is not direct answer for EFCore.BulkExtensions, but alternative how to do that with linq2db.EntityFrameworkCore. Note that I'm one of the creators.

await context.SomeTable
    .ToLinqToDBTable()
    .Merge()
    .Using(entitiesList)
    .On((t, s) => t.Id == s.Id)
    .InsertWhenNotMatched()
    .UpdateWhenMatchedAnd((t, s) => s.UpdatedAt > t.UpdatedAt)
    .MergeAsync();

Select appropriate package 2.x for EF Core 2.x, 3.x for EF Core 3.1.x, etc.