实体框架 [Key] 标签未被识别

Posted 2023-03-31

【中文标题】实体框架 [Key] 标签未被识别

【英文标题】：Entity Framework [Key] tag not being recognised

【发布时间】：2015-01-03 02:54:18

【问题描述】：

尽管我有 [Key] 标记并包括 System.ComponentModel.DataAnnotations 命名空间，但我收到没有为我的每个类库类定义键的警告错误，here是我的上下文：

上下文：

namespace Project.Data

public class ProjectContext : DbContext, IProjectContext

    public ProjectContext(string connString)
        : base(connString)
    
        this.Configuration.LazyLoadingEnabled = true;
        Database.SetInitializer<ProjectContext>(new ProjectInitializer());
        this.Database.CreateIfNotExists();
        this.Database.Initialize(true);
    

    public IDbSet<Article> Article  get; set; 

    public IDbSet<Brand> Brand  get; set; 

    public IDbSet<Colour> Colour  get; set; 

    public IDbSet<Customer> Customer  get; set; 

    public IDbSet<CustomerCredit> CustomerCredit  get; set; 

    public IDbSet<Delivery> Delivery  get; set; 

    public IDbSet<DesignerTicket> DesignerTicket  get; set; 

    public IDbSet<EuroRate> EuroRate  get; set; 

    public IDbSet<Gift> Gift  get; set; 

    public IDbSet<GZero> GZero  get; set; 

    public IDbSet<InvoiceStock> InvoiceStock  get; set; 

    public IDbSet<PrintOptions> PrintOptions  get; set; 

    public IDbSet<Product> Product  get; set; 

    public IDbSet<ProductLocation> ProductLocation  get; set; 

    public IDbSet<Sale> Sale  get; set; 

    public IDbSet<SaleAccount> SaleAccount  get; set; 

    public IDbSet<SalesToWeb> SalesToWeb  get; set; 

    public IDbSet<Shop> Shop  get; set; 

    public IDbSet<Staff> Staff  get; set; 

    public IDbSet<Ticket> Ticket  get; set; 

    public IDbSet<Transfer> Transfer  get; set; 

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

上下文接口：

namespace Project.Data

public interface IProjectContext

    IDbSet<Article> Article  get; set; 

    IDbSet<Brand> Brand  get; set; 

    IDbSet<Colour> Colour  get; set; 

    IDbSet<Customer> Customer  get; set; 

    IDbSet<CustomerCredit> CustomerCredit  get; set; 

    IDbSet<Delivery> Delivery  get; set; 

    IDbSet<DesignerTicket> DesignerTicket  get; set; 

    IDbSet<EuroRate> EuroRate  get; set; 

    IDbSet<Gift> Gift  get; set; 

    IDbSet<GZero> GZero  get; set; 

    IDbSet<InvoiceStock> InvoiceStock  get; set; 

    IDbSet<PrintOptions> PrintOptions  get; set; 

    IDbSet<Product> Product  get; set; 

    IDbSet<ProductLocation> ProductLocation  get; set; 

    IDbSet<Sale> Sale  get; set; 

    IDbSet<SaleAccount> SaleAccount  get; set; 

    IDbSet<SalesToWeb> SalesToWeb  get; set; 

    IDbSet<Shop> Shop  get; set; 

    IDbSet<Staff> Staff  get; set; 

    IDbSet<Ticket> Ticket  get; set; 

    IDbSet<Transfer> Transfer  get; set; 

[Key] 修饰类示例：

namespace Project.Data

public class Article 

    [Key]
    public int ArticleID; 

    public bool IsCore; 

    public string Make; 

    public string Product; 

    public decimal Sale; 

    public string Department;

    public string Scale; 

    public string Detail;

    public DateTime InDate;

    public decimal Reduce;

    public bool IsOnSale;

    public string VAT;

    public bool IsOnWeb;

    public string ProductCode;

    public string Pick;

    public string MemoDetail;

    public string LOC;

    public string ColourCode;

    public bool StatusFlag;

    public string Terminal;

尽管在文章上放置了 [Key]，但我收到文章类的以下消息，如下所示，并且每个类都重复此消息：

Project.Data.Article: : EntityType 'Article' has no key defined. Define the key for this EntityType.

有人看到我在这里做错了吗？将不胜感激

【参考方案1】：

通过包含 get; set; 在声明的末尾

【讨论】：

感谢愚蠢的错误，我一辈子都看不到它 :)

@Jay 别担心，很容易错过！