我在 asp.net MVC5 中遇到冲突错误

Question

我在 asp.net MVC5 中遇到冲突错误

这是我的Form模型的模型类

[DatabaseGenerated(DatabaseGeneratedOption.Identity)]
        [Key]
        public Guid FormId { get; set; }
        public Guid EntityBlockId { get; set; } // LinkToEntityBlockId
        public virtual EntityBlock EntityBlock { get; set; }

这是我的 EntityBlock 模型的模型类

[DatabaseGenerated(DatabaseGeneratedOption.Identity)]
        [Key]
        public Guid EntityBlockId { get; set; }

        public virtual ICollection<Form> Form { get; set; }

并插入如下值：

FormStaticMethodsController formStaticMethodsControllerObj = new FormStaticMethodsController();

        Form form = new Form();
                    form.EntityBlockId = linkToBlockId;
    formStaticMethodsControllerObj.CreateForm(form);

方法是：

 public Guid CreateForm(Form form)
            {
                db.Forms.Add(form);
                db.SaveChanges();

                return form.FormId;
            }

错误是：

INSERT 语句与 FOREIGN KEY 约束“FK_dbo.Form_dbo.EntityBlock_EntityBlockId”冲突。冲突发生在数据库“aspnet-Planetskool-20150303080110”、表“dbo.EntityBlock”、列“EntityBlockId”中。 声明已终止。

Answer 1

如果您将EntityBlockId定义为EntityBlock 的外键值，则应使用ForeignKeyAttribute 将EntityBlock 属性链接与字段EntityBlockId 链接：

    [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
    [Key]
    public Guid FormId { get; set; }
    public Guid EntityBlockId { get; set; } // LinkToEntityBlockId

    [ForeignKey("EntityBlockId")]
    public virtual EntityBlock EntityBlock { get; set; }