Question

我在MVC3中使用实体框架代码优先与SQLCE建立类似博客的网站。如果需要，我愿意重新设计结构，获得一些帮助会很棒。

上下文设置为：

public class BinarContext : DbContext
{
    public DbSet<Member> Members { get; set; }
    public DbSet<Post> Posts { get; set; }
    public DbSet<Reply> Replies { get; set; }

    public BinarContext()
    {
        this.Configuration.LazyLoadingEnabled = true;
    }

    protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
        modelBuilder.Entity<Member>().HasMany(member => member.Posts)
                                     .WithRequired(post => post.Member)
                                     .HasForeignKey(post => post.MemberID)
                                     .WillCascadeOnDelete();

        modelBuilder.Entity<Member>().HasMany(member => member.Replies)
                                     .WithRequired(reply => reply.Member)
                                     .HasForeignKey(reply => reply.MemberID)
                                     .WillCascadeOnDelete();

        modelBuilder.Entity<Post>().HasMany(post => post.Replies)
                                   .WithRequired(reply => reply.Post)
                                   .HasForeignKey(reply => reply.PostID)
                                   .WillCascadeOnDelete();

        base.OnModelCreating(modelBuilder);
    }
}

* 注意：* 我试图按照其他人的建议摆脱WillCascadeOnDelete();，但到目前为止还没有工作。

模型是：

会员类有关于会员发布的帖子和回复的信息。

public class Member
{
    public Guid ID {get; set;}
    public string Username { get; set; }
    public string Email { get; set; }

    public virtual ICollection<Post> Posts { get; set; }
    public virtual ICollection<Reply> Replies { get; set; }
}

Post类，其中包含有关发布该成员的成员以及为其发布的已回复成员的信息。

public class Post
{
    public Guid ID {get; set;}
    [DataType(DataType.MultilineText)]
    public string Text { get; set; }
    public Guid MemberID { get; set; }

    public virtual Member Member { get; set; }
    public virtual ICollection<Reply> Replies { get; set; }
}

回复类，其中包含有关发布该成员的成员以及发布的帖子的信息。

public class Reply    
{
    public Guid ID { get; set; }
    [DataType(DataType.MultilineText)]
    public string Text { get; set; }

    public Guid PostID { get; set; }
    public Guid MemberID { get; set; }

    public virtual Post Post { get; set; }
    public virtual Member Member { get; set; }
}

感谢您的帮助：）

Answer 1

试试这个：

    protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
        modelBuilder.Entity<Member>().HasKey(x=>x.ID)
                                     .HasMany(x => x.Posts)
                                     .WillCascadeOnDelete();

        modelBuilder.Entity<Member>().HasKey(x=>x.ID)
                                     .HasMany(x => x.Replies)
                                     .WillCascadeOnDelete();

        modelBuilder.Entity<Post>().HasKey(x=>x.ID)
                                   .HasMany(x => x.Replies)
                                   .WillCascadeOnDelete();

        modelBuilder.Entity<Post>().HasKey(x=>x.ID)
                                   .WithRequired(x => x.Member)
                                   .WithMany(x=>x.Posts);

        modelBuilder.Entity<Replies>().HasKey(x=>x.ID)
                                   .WithRequired(x => x.Member)
                                   .WithMany(x=>x.Replies);

        modelBuilder.Entity<Replies>().HasKey(x=>x.ID)
                                   .WithRequired(x => x.Post)
                                   .WithMany(x=>x.Replies);

        base.OnModelCreating(modelBuilder);
    }

如何在EF中绕过这个周期性参考？

1 个答案: