Question

我有两张表新闻和新闻评论。我遵循命名规则

结构新闻评论

public class NewsComment : BaseComment
{
    public int NewsId { get; set; }

    public virtual News News { get; set; }      
}

但查询返回异常无效的列名“News_Id”。我知道在表格中没有相关列时创建了这个异常。

CREATE TABLE [dbo].[NewsComments](
[Id] [int] IDENTITY(1,1) NOT NULL,
[NewsId] [int] NOT NULL,
[Text] [varchar](max) NOT NULL,
[UserId] [int] NOT NULL,
[CommentDate] [datetime] NOT NULL,
[Ip] [varchar](40) NOT NULL, CONSTRAINT [PK_NewsComments] PRIMARY KEY CLUSTERED([Id] ASC )WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]) ON [PRIMARY]

BaseComment

public abstract class BaseComment : BasePersistentEntity, IComment
{

    public int UserId { get; set; }

    public virtual BaseUser User { get; set; }

    [Display(ResourceType = typeof(FrameworkResurce), Name = "CommentText")]
    public string Text { get; set; }


    [Display(ResourceType = typeof(FrameworkResurce), Name = "CommentDate")]
    public DateTime CommentDate { get; set; }


    public string Ip { get; set; }
}

新闻

public class News : BaseContent
{
    [Display(ResourceType = typeof(NewsResurce), Name = "NewsImage")]
    public string NewsImage { get; set; }

    public virtual ICollection<NewsCommentView> CommentViews { get; set; }
}

BaseContent

public abstract class BaseContent : BasePersistentEntity
{
    [Display(ResourceType = typeof(FrameworkResurce), Name = "Keywords")]
    public string Keywords { get; set; }


    [Display(ResourceType = typeof(FrameworkResurce), Name = "TitleTranslit")]
    public string TitleTranslit { get; set; }

    [Required(ErrorMessageResourceType = typeof(FrameworkResurce), ErrorMessageResourceName = "IsTextEmpty")]
    [Display(ResourceType = typeof(FrameworkResurce), Name = "Title")]
    public string Title { get; set; }


    [Display(ResourceType = typeof(FrameworkResurce), Name = "Description")]
    public string Description { get; set; }


    [Display(ResourceType = typeof(FrameworkResurce), Name = "Contents")]
    public string Contents { get; set; }


    [Display(ResourceType = typeof(FrameworkResurce), Name = "DatePublish")]
    public DateTime DatePublish { get; set; }


    [Display(ResourceType = typeof(FrameworkResurce), Name = "AuthorPublish")]
    public string AuthorPublish { get; set; }

    [Display(ResourceType = typeof(FrameworkResurce), Name = "Author")]
    public string Author { get; set; }

    [Display(ResourceType = typeof(FrameworkResurce), Name = "AuthorUrl")]
    public string AuthorUrl { get; set; }


    [Display(ResourceType = typeof(FrameworkResurce), Name = "Views")]      
    public int Views { get; set; }


    [Display(ResourceType = typeof(FrameworkResurce), Name = "Comments")]
    public int Comments { get; set; }


    [Display(ResourceType = typeof(FrameworkResurce), Name = "IsComment")]
    public bool IsComment { get; set; }


    [Display(ResourceType = typeof(FrameworkResurce), Name = "SumVote")]
    public int SumVote { get; set; }


    [Display(ResourceType = typeof(FrameworkResurce), Name = "VoteCount")]
    public int VoteCount { get; set; }

    [NotMapped]
    [Display(ResourceType = typeof(FrameworkResurce), Name = "Rating")]
    public double Rating
    {
        get
        {
            if (VoteCount > 0)
            {
                return Math.Round((float)SumVote/VoteCount, 2);
            }

            return 0;
        }
    }
}

查询

private IEnumerable<NewsComment> GetComments()
    {
        var news = NewsCommentRepository.AllIncluding(c=>c.User,c=>c.News);
        return news;
    }

private DataRepository<NewsComment> NewsCommentRepository
        {
            get { return DataRepository<NewsComment>.Repository; }
        }

DataRepository

public class DataRepository<T> where T : BasePersistentEntity
{
    public static DataRepository<T>  Repository
    {
        get
        {
            return new DataRepository<T>();
        }
    }

    private readonly SGNContext<T> context = new SGNContext<T>();

    public IQueryable<T> All
    {
        get { return this.context.Table; }
    }

    public IQueryable<T> AllIncluding(params Expression<Func<T, object>>[] includeProperties)
    {
        IQueryable<T> query = this.context.Table;
        return includeProperties.Aggregate(query, (current, includeProperty) => current.Include(includeProperty));
    }

    public T Find(int id)
    {
        return this.context.Table.Find(id);
    }

    public void InsertOrUpdate(T country)
    {
        if (country.Id == default(int))
        {
            // New entity
            this.context.Table.Add(country);
            Save();
        }
        else
        {
            // Existing entity
            this.context.Entry(country).State = EntityState.Modified;
            Save();
        }
    }

    public void Delete(int id)
    {
        var country = this.context.Table.Find(id);
        this.context.Table.Remove(country);
        this.Save();
    }

    private void Save()
    {
        this.context.SaveChanges();
    }
}

使用GetComments

    [GridAction]
    public ActionResult AjaxCommentsBinding()
    {
        return View(new GridModel<NewsComment>
        {
            Data = GetComments()
        });
    }

NewsCommentViews

CREATE VIEW [dbo].[NewsCommentViews]
AS
SELECT     dbo.NewsComments.NewsId, dbo.NewsComments.Text, dbo.NewsComments.UserId, dbo.NewsComments.CommentDate, dbo.NewsComments.Ip, 
                      dbo.Roles.RoleName, dbo.Users.UserName, dbo.Users.DateRegistered, dbo.NewsComments.Id, dbo.Users.Avatar
FROM         dbo.NewsComments INNER JOIN
                      dbo.Users ON dbo.NewsComments.UserId = dbo.Users.Id INNER JOIN
                      dbo.Roles ON dbo.Users.RoleId = dbo.Roles.Id

NewsCommentViews

[Table("NewsCommentViews")]
    public class NewsCommentView : NewsComment
    {
        public string RoleName { get; set; }

        public string UserName { get; set; }

        public DateTime DateRegistered { get; set; }

        public string Avatar { get; set; }
    }

Answer 1

问题在于News和NewsCommentView之间的关系：关系的一端是News.CommentViews集合。但另一端是不 NewsCommentView.News正如您所期望的那样。为什么？因为News类上的属性NewsCommentView不是声明，而是基类 NewsComment。现在EF不允许实体参与与导航属性的关系，该属性在该实体类本身上不是声明，而是仅在基类中。

因此，因为您没有Fluent映射，EF仅按约定定义所有关系。会发生什么？

News声明了导航属性CommentViews，并指向NewsCommentView类。
EF未在News类中找到{strong>声明类型的NewsCommentView的反向属性。（有一个，但它在基类中，不算数。）
因此，EF认为NewsCommentView类中关系的另一端未暴露。
未公开意味着：EF没有导航属性或外键属性，并且假定数据库表/视图NewsCommentViews中必需的外键列将具有标准的常规名称。
此常规名称为NameOfEntityClass_PKPropertyName - ＆gt; News_Id

但您在视图中的真实姓名是NewsId。因此，EF查询不存在的列News_Id，因此例外。

当您的MVC-View访问NewsComment.News.CommentViews时，可能会因延迟加载而触发异常。

您可以通过在Fluent API中明确指定FK列名来解决此问题（据我所知，没有其他方法没有Fluent映射）：

public class MyContext : DbContext
{
    // ...

    protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
        modelBuilder.Entity<News>()
            .HasMany(n => n.CommentViews)
            .WithRequired() // <- no param because not exposed end of relation,
                            // nc => nc.News would throw an exception
                            // because nc.News is in the base class
            .Map(a => a.MapKey("NewsId"));
    }
}

但警告：请注意，NewsCommentView.News 不属于News.CommentViews的关系的另一端。这意味着，如果您的NewsCommentView集合中有News.CommentViews，那么NewsCommentView.News 不会指向该News对象。另一端是不可见的，不会在模型中暴露。上面的映射只是修复了FK列名称问题，但是没有改变约定会创建的关系（除了可能将关系更改为required而不是可选）。

Answer 2

您的SQL在用户和ID之间没有下划线。

从数据库更新EDMX（通过右键菜单）并检查映射。

实体框架4.1列名无效

2 个答案: