如何解決EF中的這種循環引用？

Question

我在MVC3中使用實體框架代碼優先，用於類似博客的網站。 如果需要，我很樂意重新設計結構，如果能得到一些幫助將會很棒。

的情況下被設置爲：

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：*我試圖擺脫WillCascadeOnDelete();別人的建議對SO，但迄今沒有奏效。

的車型有：

會員類有關於由會員提出的帖子和回覆信息。

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; } 
} 

有關於誰張貼和回覆的貼吧會員信息發佈類。

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; } 
} 

Reply類具有關於發佈它的成員以及發佈它的帖子的信息。

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; } 
} 

感謝您的幫助:)

Answer 1

試試這個：

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); 
    }