Question

我正在尝试使用Code-First创建一个sdf，但是我收到的错误是没有为我的表定义键，并且无法理解为什么。

我有以下课程： -

public class Article
{
    [Key]
    public int ArticleID;

    //[Display(Name = "Title")]
    //[MaxLength(255)]
    //[Required(ErrorMessage="Title is required")]
    public string ArticleTitle;

    //[Display(Name = "Date")]
    //[DisplayFormat(DataFormatString = "{0:#.#}", ApplyFormatInEditMode = true, NullDisplayText = "")]
    //[Required(ErrorMessage = "Date is required")]
    public DateTime ArticleDate;

    //[Display(Name = "Text")]
    //[Required(ErrorMessage = "Text is required")]
    public string ArticleText;

    //[Display(Name = "Source")]
    public string ArticleSource;

    //[Display(Name = "Category")]
    public int CategoryID { get; set; }

    public virtual Category Category { get; set; }

}

public class Category
{
    [Key]
    public int CategoryID;

    [Display(Name = "Category Title")]
    [MaxLength(255)]
    [Required(ErrorMessage = "Category Title is required")]
    public string CategoryTitle;

}

public class CommonsContext : DbContext
{
    public DbSet<Article> Articles { get; set; }
    public DbSet<Category> Categories { get; set; }

    protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
        modelBuilder.Conventions.Remove<PluralizingTableNameConvention>();

        //A one-to-one relationship between the Article and Category tables. 
        modelBuilder.Entity<Article>().HasRequired(x => x.Category);
    }

}

并在web.config中： -

<add name="CommonsContext" connectionString="Data Source=|DataDirectory|Personal.sdf" providerName="System.Data.SqlServerCe.4.0" />

当我浏览到App_Data文件夹时，我甚至看不到Personal.sdf，所以这意味着它甚至都没有创建。

我做错了什么？还不清楚。

感谢您的帮助和时间

Answer 1

可能是因为您没有为关键属性定义getter和setter

public int ArticleID { get; set; }

public int CategoryID { get; set; }

System.Data.Entity.Edm.EdmEntityType没有定义键

1 个答案: