多对多映射表

在您的DbContext OnModelCreating上执行此操作：

protected override void onModelCreating(DbModelBuilder modelBuilder){        modelBuilder.Entity<Recipe>()        .HasMany(x => x.Members)        .WithMany(x => x.Recipes)    .Map(x =>    {        x.ToTable("Cookbooks"); // third table is named Cookbooks        x.MapLeftKey("RecipeId");        x.MapRightKey("MemberId");    });}

您也可以用另一种方法来做，就是一样，只是同一枚硬币的另一面：

modelBuilder.Entity<Member>()    .HasMany(x => x.Recipes)    .WithMany(x => x.Members).Map(x =>{  x.ToTable("Cookbooks"); // third table is named Cookbooks  x.MapLeftKey("MemberId");  x.MapRightKey("RecipeId");});

进一步的例子：

http://www.ienablemuch.com/2011/07/using-checkbox-list-on-aspnet-mvc-
with_16.html

http://www.ienablemuch.com/2011/07/nhibernate-equivalent-of-
entity.html

更新

为了防止对Author属性进行周期性引用，除了上面的内容外，您还需要添加以下内容：

modelBuilder.Entity<Recipe>()    .HasRequired(x => x.Author)    .WithMany()    .WillCascadeonDelete(false);

想法来源：EF代码优先，具有多对多自引用关系

核心是，您需要通知EF
Author属性（这是一个Member实例）没有Recipe集合（用表示

WithMany()

这些是从上面的“代码优先”映射创建的表：

CREATE TABLE Members(    Id int IDENTITY(1,1) NOT NULL primary key,    Name nvarchar(128) NOT NULL);CREATE TABLE Recipes(    Id int IDENTITY(1,1) NOT NULL primary key,    Name nvarchar(128) NOT NULL,    AuthorId int NOT NULL references Members(Id));CREATE TABLE Cookbooks(    RecipeId int NOT NULL,    MemberId int NOT NULL,    constraint pk_Cookbooks primary key(RecipeId,MemberId));