小编pao*_*olo的帖子

我有一个现有的 SQL Server 数据库，其中通过连接表实现了多对多关系Books<-> ：AuthorsPublications

CREATE TABLE [dbo].[Books]
(
    [BookId] INT IDENTITY,
    [Title] NVARCHAR(160) NOT NULL,
    ...
)

CREATE TABLE [dbo].[Authors]
(
    [AuthorId] INT IDENTITY,
    ...
)

CREATE TABLE [dbo].[Publications]
(
    [BookId] INT NOT NULL,
    [AuthorId] INT NOT NULL,

    CONSTRAINT [PK_Publication] PRIMARY KEY ([BookId], [AuthorId])
)

我需要在 Entity Framework Core 5 中配置多对多关系。

对于 EF 6，这相当简单：

protected override void OnModelCreating(DbModelBuilder mb)
{
    mb.Entity<Author>() // an Author
         .HasMany(a => a.Books) // has many Books
         .WithMany(b => b.Authors) // …