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1.http://www.cnblogs.com/libingql/archive/2013/01/31/2888201.html
2.多对多
 protected override void OnModelCreating(DbModelBuilder modelBuilder)
        {
            //多对多
            Database.SetInitializer<CmsDbContext>(null);
            modelBuilder.Entity<Article>()
                .HasMany(e => e.Tags)
                .WithMany(e => e.Articles)
                .Map(m =>
                {
                    m.ToTable("ArticleTag");
                    m.MapLeftKey("ArticleId");
                    m.MapRightKey("TagId");
                });
            base.OnModelCreating(modelBuilder);
        }
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原文地址:http://www.cnblogs.com/kexb/p/4858881.html