LINQ to SQL并为单个主键向外部表添加多个记录

Question

I have a database with around 20 tables, and one of them is an "attachment" table. All but one table has a foreign key to the "Identifier" table so that each record in the Identifier table identifies one record in all of the other tables.

For the attachments table, I have my two primary keys which identify the record from the Identifiers table that it is associated with. I have two other fields, one of which is supposed to act as an "index" to indicate that there can be multiple attachments per Identifier.

The issue I'm running into is that I cannot figure out how to add multiple attachments to a single Identifier object using LINQ to SQL. I know I cannot have multiple records with the same primary keys, so would I have to make the attachment index a primary key as well? Would that turn the Attachment member of the Identifier object in my C# project into a list? I guess I'm not understanding how I can have multiple records in the Attachment table refer to the same Identifier record.

Answer 1

将附件表中的索引列更改为主键并刷新Visual Studio中的DBML架构后，引用Identifier类中的Attachment实体的EntityRef对象更改为EntitySet，从而允许我向每个Identifier添加多个Attachment实体。