Question

我得到一个可能很容易解决的常见错误，但我不知道如何解决。这是我得到的信息。

列名无效。 [节点名称（如果有）= Extent1，列名= Blog_BlogId]

描述：在执行当前Web请求期间发生了未处理的异常。请查看堆栈跟踪以获取有关错误及其源自代码的位置的更多信息。

异常详细信息： System.Data.SqlServerCe.SqlCeException：列名无效。 [节点名称（如果有）= Extent1，列名= Blog_BlogId]

这是我的代表我的实体的类：

public class BlogContext : DbContext
{
    public BlogContext()
        : base("SqlCeServices")
    {

    }

    public DbSet<User> Users { get; set; }

    public DbSet<Blog> Blogs { get; set; }

    public DbSet<Post> Posts { get; set; }

    public DbSet<Category> Categories { get; set; }

    public DbSet<Tag> Tags { get; set; }
}

[Table("aspnet_Users")]
public class User
{
    [Required]
    public Guid ApplicationId { get; set; }

    [Required]
    public Guid UserId { get; set; }

    [Required]
    public string UserName { get; set; }

    [Required]
    public string LoweredUserName { get; set; }

    public string MobileAlias { get; set; }

    [Required]
    public bool IsAnonymous { get; set; }

    [Required]
    public DateTime LastActivityDate { get; set; }
}

public class Blog
{
    [Key]
    public int BlogId { get; set; }

    [Required]
    public string Name { get; set; }
    public string Url { get; set; }
    public int Rating { get; set; }

    public virtual ICollection<User> Editors { get; set; }

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

public class Post
{
    [Key]
    public int PostId { get; set; }
    [Required, MaxLength(200)]
    public string Title { get; set; }
    public string Content { get; set; }
    public string Abstract { get; set; }
    public DateTime DateCreated { get; set; }
    public DateTime DateLastEdited { get; set; }

    public virtual User UserId { get; set; }

    public virtual ICollection<Category> Categories { get; set; }
    public virtual ICollection<Tag> Tags { get; set; }

    public virtual Blog BlogId { get; set; }
}

public class Category
{
    [Key]
    public int CategoryId { get; set; }
    [Required, MaxLength(200)]
    public string Title { get; set; }
    public string Description { get; set; }

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

    public virtual Category ParentCategory { get; set; }

    public virtual Blog BlogId { get; set; }
}

public class Tag
{
    [Key]
    public int TagId { get; set; }
    [Required, MaxLength(200)]
    public string Title { get; set; }

    public virtual Blog BlogId { get; set; }
}

Answer 1

考虑更改Post类，以便BlogId将FK引用到关联的Blog而不是Blog对象本身。添加新属性Blog以引用实际的Blog对象。

public class Post
{
    [Key]
    public int PostId { get; set; }
    [Required, MaxLength(200)]
    public string Title { get; set; }
    public string Content { get; set; }
    public string Abstract { get; set; }
    public DateTime DateCreated { get; set; }
    public DateTime DateLastEdited { get; set; }

    public virtual User UserId { get; set; }

    public virtual ICollection<Category> Categories { get; set; }
    public virtual ICollection<Tag> Tags { get; set; }

    public virtual int BlogId { get; set; }
    public virtual Blog Blog { get; set; }
}

Answer 2

您可以尝试... ForeignKey 注释

public virtual int BlogId {get;组; }

[ForeignKey（＆＃34; BlogId＆＃34;）] 公共虚拟博客博客{get;组; }

Answer 3

从数据库中删除连接，删除与应用程序相关的任何应用程序数据并重建，然后重试，这对我有用。

列名无效

3 个答案: