c# - EntityType 'Worker' 没有定义键。定义此 EntityType 的键

Question

我的代码位于Solution.Models.Worker中:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Data.Entity;

namespace Solution.Models
{
    public class Worker
    { 
       public int AsmensKodas { get; set; }
       public string Vardas { get; set; }
       public string Pavarde { get; set; }
       public DateTime GimimoData { get; set; }
       public string Adresas { get; set; }
       public bool AktyvumoPozymis { get; set; } 
    }

    public class WorkerDBContext : DbContext
    {
        public DbSet<Worker> Worker { get; set; }
    }
}

我通过添加更改了 web.config 文件

<connectionStrings>
    <add name="WorkerDBContext" 
         connectionString="Data Source=(LocalDB)\MSSQLLocalDB;AttachDbFilename=|DataDirectory|\Workers.mdf;Integrated Security=True" 
         providerName="System.Data.SqlClient"/>
</connectionStrings>

当我尝试使用“带有 View 的 MVC 5 Controller ，使用 Entity Framework ”和配置来添加 Controller 时

• 模型类:Worker (Solution.Models)
• 数据上下文类:WorkerDbContext (Solution.Models)
• Controller 名称:WorkersController

我收到一条错误消息

There was an error running the selected code generator:
'Unable to retrieve metadata for 'Solution.Models.Worker.' One or more validation errors ware detected during model generation:
Solution.Models.Worker::EntityType 'Worker' has no key defined.
Define the key for this EntityType.
Workers:EntityType:EntitySet 'Workers' is based on type 'Worker' that has no keys defined.

有什么建议或者我做错了什么吗？

Answer 1

模型的属性之一应该是 Key。因此，将 [Key] 注释放在其中一个属性的顶部。像这样:

public class Worker
{ 
   [Key]
   public int AsmensKodas { get; set; }
   public string Vardas { get; set; }
   public string Pavarde { get; set; }
   public DateTime GimimoData { get; set; }
   public string Adresas { get; set; }
   public bool AktyvumoPozymis { get; set; } 

}

请不要忘记将此行添加到您的 using 指令中:

using System.ComponentModel.DataAnnotations;

此外，如果您的 Model 中有一个名称为 Id 的属性，则无需将 [Key] 属性添加到它。