的EntityType没有密钥定义的错误 [英] EntityType has no key defined error
本文介绍了的EntityType没有密钥定义的错误的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
控制器:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using MvcApplication1.Models;
using System.ComponentModel.DataAnnotations.Schema;
namespace MvcApplication1.Controllers
{
public class studentsController : Controller
{
//
// GET: /students/
public ActionResult details()
{
int id = 16;
studentContext std = new studentContext();
student first = std.details.Single(m => m.RollNo == id);
return View(first);
}
}
}
的DbContext型号:
DbContext Model :
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Data.Entity;
namespace MvcApplication1.Models
{
public class studentContext : DbContext
{
public DbSet<student> details { get; set; }
}
}
型号:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.ComponentModel.DataAnnotations.Schema;
namespace MvcApplication1.Models
{
[Table("studentdetails")]
public class student
{
public int RollNo;
public string Name;
public string Stream;
public string Div;
}
}
数据库表:
CREATE TABLE [dbo].[studentdetails](
[RollNo] [int] NULL,
[Name] [nvarchar](50) NULL,
[Stream] [nvarchar](50) NULL,
[Div] [nvarchar](50) NULL
)
在的global.asax.cs
in global.asax.cs
Database.SetInitializer<MvcApplication1.Models.studentContext>(null);
但它给和模型生成过程中检测到的错误的一个或多个验证错误。
but it gives and error One or more validation errors were detected during model generation
推荐答案
Model类应改为:
The Model class should be changed to :
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.ComponentModel.DataAnnotations.Schema;
using System.ComponentModel.DataAnnotations;
namespace MvcApplication1.Models
{
[Table("studentdetails")]
public class student
{
[Key]
public int RollNo { get; set; }
public string Name { get; set; }
public string Stream { get; set; }
public string Div { get; set; }
}
}
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