两相同的树形结构，为什么一个成功一个失败

[已解决问题] 解决于 2016-11-10 10:05

// 这个是出问题的实体   
 public class PClazz : AggregateRoot
    {
        [Required]
        public string Name { get; set; }

        public string Descript { get; set; }

        public DateTime CreateTime { get; set; }

        public int? Top { get; set; }
        public virtual PClazz Parent { get; set; }

        public virtual List<PClazz> Chile { get; set; }
    }

//Map定义
    public class PClazzMap : EntityTypeConfiguration<PClazz>
    {
        public PClazzMap()
        {
            this.HasKey(p => p.ID);

            this.ToTable("P_ProductClazz");


            this.HasOptional(p => p.Parent)
                .WithMany(p => p.Chile)
                .HasForeignKey(p => p.Top)
                .WillCascadeOnDelete(false);
        }
    }

            var urep = new Buybate.Domain.Repositories.PClazzRepository();
                   
 var user = new Domain.Entity.PClazz();
                    user.CreateTime = DateTime.Now;
                    user.Descript = Stupid.Common.CodeCommon.CreateCode(Stupid.Common.CodeCommon.CodeType.Chinese, ran.Next(0, 150));
                    user.Name = Stupid.Common.CodeCommon.CreateCode(Stupid.Common.CodeCommon.CodeType.Chinese, ran.Next(0, 150));

                    urep.Insert(user);
                urep.SaveChange();
//这只是个测试，在SaveChange出错报异常：
 $exception    {"“xxxx.PClazz”中的实体参与“Product_Clazz”关系。找到 0 个相关的“Product_Clazz_Source”。应有 1 个“Product_Clazz_Source”。"}    System.Data.Entity.Infrastructure.DbUpdateException

现在是不会有异常的

//实体  
  public class BlogClazz :AggregateRoot
    {
        /// <summary>
        /// 类别名称
        /// </summary>
        [Required]
        public string CName { get; set; }

        /// <summary>
        /// 上一级ID
        /// </summary>
        public int? Top { get; set; }

        /// <summary>
        /// 层次ID
        /// </summary>
        public int Deep { get; set; }

        /// <summary>
        /// 添加时间
        /// </summary>
        public DateTime AddTime { get; set; }
        
        /// <summary>
        /// 类别描述
        /// </summary>
        public string Describe { get; set; }


        public virtual BlogClazz Parent { get; set; }

        public virtual List<BlogClazz> BlogCList { get; set; }
    }
//Map
    public class BlogClazzMap : EntityTypeConfiguration<BlogClazz>
    {
        public BlogClazzMap()
        {
            this.HasKey(p => p.ID);

            this.ToTable("M_BlogClazz");

            this.HasOptional(p => p.Parent)
                .WithMany(p => p.BlogCList)
                .HasForeignKey(p => p.Top)
                .WillCascadeOnDelete(false);
            
        }
    }

//测试添加
            var blo = new Domain.Repositories.BlogClazzRepository();
                Domain.Entity.BlogClazz bcl = new Domain.Entity.BlogClazz();

                bcl.AddTime = DateTime.Now;
                bcl.CName = Stupid.Common.CodeCommon.CreateCode(Stupid.Common.CodeCommon.CodeType.Chinese);
                bcl.Deep = 1;
                bcl.Describe = Stupid.Common.CodeCommon.CreateCode(Stupid.Common.CodeCommon.CodeType.Chinese);

                blo.Insert(bcl);
            blo.SaveChange();