Question

I would like to know how to save new associations for entities with many to many relationships.

I’ve got 3 tables:

Partner -  -- ParnterID  -- ParnterName  -- Etc  PartnerRegion  -- PartnerRegionID  -- RegionID  -- PartnerID  Region  -- RegionID  -- RegionName  -- Etc 

I have the entities created, and the associations appear in my entities when I look at them in the generated linq-to-sql code. Then I query the database for a partner:

_context.Partners.Where(x => x.PartnerID == 12345); 

Then I would like to clear out all the associations for PartnerRegions and then add some from information collected from the UI.

What would that code look like?

Answer 1

Something like this should work:

var p = _context.Partners.Where(x => x.PartnerID == 12345); p.PartnerRegions.Clear();  Loop over UI elements   p.PartnerRegions.Add(new PartnerRegion() { property = value } ); End loop