How to make a many-to-many relationship in EF CodeFirst with fields with unique values ​​for each relationship?

Question

.NET

Two tables with entities
DataWorkbook {Id, Name, Type, Columns}
Column {Id, Name, CodeName, Workbooks }
And one table for relationships
DataWorkbook_Column {DataWorkbookId, ColumnId, ColumnIndex }
We get a unique ColumnIndex field for each relationship. Although, logically, this is an indicator of the Column entity in a good way.
But since I write a turn in c#, then the question is.
How to implement such a relationship in EntityFramework Code First??

Answer 1

www.entityframeworktutorial.net/code-first/configu...