实体框架添加记录到连接表

Question

Given 3 database tables: Businesses, Markets, BusinessesMarkets

I want to add a new business and I want the business to be in a particular market. How do I add to the join table in EntityFramework speak?

For example, the user wants to create a new business called ABC Co and add it to the Southern region market.

Answer 1

This is making some assumptions about your domain model:

var southernRegion = db.Markets().Find(the_id);
var abcCo = new Business();

southernRegion.Businesses.Add(abcCo);

db.SaveChanges();

EF will handle the join table for you!