Entity Framework Extensions Column Synchronize DeleteKey Subset Expression

The ColumnSynchronizeDeleteKeySubsetExpression allows you to synchronize (insert/update/delete) only a part of the tables by specifying a key.

The following example synchronizes customers of Type equal to "1" by specifying the customer name as a key.

var customers = new List<Customer>();
customers.Add(new Customer() { Name = "Carson", Type = 1, Description = "Updated_Description of Carson", IsActive = false });
customers.Add(new Customer() { Name = "Alexander", Type = 1, Description = "Description of Alexander", IsActive = false });

using (var context = new EntityContext())
{
    context.BulkSynchronize(customers, options => {
        options.ColumnPrimaryKeyExpression = customer => customer.Name;
        options.ColumnSynchronizeDeleteKeySubsetExpression = customer => customer.Type;
    });
}

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A synchronize is a mirror operation from the data source to the database. All rows that match the entity key are UPDATED, non-matching rows that exist from the source are INSERTED, non-matching rows that exist in the database are DELETED.

  • It updates the record of Carson as it is already in the database
  • It inserts the Alexander record because it is not available in the database.
  • It will also delete any other customers available in the database of Type "1" which are not available in the source (customers list).