Question

    public class Picture
        { 
            [Key]
            public int Id { get; set; }

            public int NewsId { get; set; }
            [ForeignKey("NewsId")]
            public virtual News News { get; set; }

            public int PostId { get; set; }
            [ForeignKey("PostId")]
            public virtual Post Post { get; set; }        
        }

    public class News
        {
            public int Id { get; set; }
            public virtual Picture Picture { get; set; }
        }

public class Post
    {
        public int Id { get; set; }
        public virtual Picture Picture { get; set; }
    }

例外：

无法确定之间关联的主要结束类型＆＃39; Project.BusinessObjects.Photo＆＃39;和＆＃39; Project.BusinessObjects.Student＆＃39 ;.主要目的必须使用以下任一方式显式配置此关联关系流畅的API或数据注释。

怎么了？

Answer 1

我认为你可以通过在其他类的键之上创建新的[key]数据注释来解决问题。像这样：

public class Picture
{ 
    [Key]
    public int Id { get; set; }

    [ForeignKey("News")]
    public int NewsId { get; set; }
    public virtual News News { get; set; }

    [ForeignKey("Post")]
    public int PostId { get; set; }        
    public virtual Post Post { get; set; }        
}

public class News
{
    [Key]
    public int Id { get; set; }
    public virtual Picture Picture { get; set; }
}

public class Post
{
    [Key]
    public int Id { get; set; }
    public virtual Picture Picture { get; set; }
}

1对1关系EF两个外键错误

1 个答案: