问题
I am using a databse first method. I generated edmx from the database. But diagrams for the tables which are in many to many relationships do not display in the generated edmx.
回答1:
If your Many to many lookup table consists of just Foreign Keys and no other fields, then it will not show up in your edmx file as a Table. It will show up under Navigation Properties of each table though.
来源：https://stackoverflow.com/questions/7544259/the-diagram-for-the-many-to-many-relationship-table-does-not-appear-in-the-edmx