Question

我在windowformapplication中使用实体框架，当我调用＆＃34; db.Persons.Add（）＆＃34;它没有显示人员的推荐并给出错误：

错误：由于其保护级别，NBTSol.Models.ContactDbContext.Persons无法访问甚至一切都是公开的，

那么为什么呢？

人物模型：

 using System;
 using System.Collections.Generic;
 using System.ComponentModel.DataAnnotations;
 using System.ComponentModel.DataAnnotations.Schema;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;

 namespace NBTSol.Models
 {
   public class Person
   {
    [Key]
    [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
    public long PersonId { get; set; }

    [Required(ErrorMessage = "First Name is Required")]
    public string FirstName { get; set; }

    [Required(ErrorMessage = "Last Name is Required")]
    public string LastName { get; set; }

    [Required(ErrorMessage = "Email is Required")]
    public string Email { get; set; }

    [Required(ErrorMessage = "Gender is Required")]
    public string Gender { get; set; }

    [Required(ErrorMessage = "Address is Required")]
    public string Address { get; set; }

    [Required(ErrorMessage = "City is Required")]
    public string City { get; set; }

    [Required(ErrorMessage = "State is Required")]
    public string State { get; set; }

    [Required(ErrorMessage = "PostalCode is Required")]
    public string PostalCode { get; set; }

    [Required(ErrorMessage = "Country is Required")]
    public string Country { get; set; }

    [Required(ErrorMessage = "Contact Number is Required")]
    public string ContactNumber { get; set; }

    [Required(ErrorMessage = "CNIC is Required")]
    public string CNIC { get; set; }


    public string OrganizationName { get; set; }
    public string Designation { get; set; }
    public string Salary { get; set; }
    public string Description { get; set; }

    public Nullable<bool> IsClient { get; set; }
    public DateTime EntryDateTime { get; set; }
    public Nullable<bool> IsDeleted { get; set; }

 }
}

我的上下文类：

      using System;
      using System.Collections.Generic;
      using System.Data.Entity;
      using System.Linq;
      using System.Text;
      using System.Threading.Tasks;

     namespace NBTSol.Models
     {
     public class ContactDbContext :DbContext
     {
    public ContactDbContext() : base( "name=DefaultConnection") { }

    DbSet<Person> Persons { get; set; }

    protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
        //Configure domain classes using Fluent API here

        base.OnModelCreating(modelBuilder);
    }
   }
  }

主要形式：[这是我尝试调用时的错误＆＃34; db.Persons.Add（）＆＃34;]

 using NBTSol.Models;
 using System;
 using System.Collections.Generic;
 using System.ComponentModel;
 using System.Data;
 using System.Drawing;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
 using System.Windows.Forms;

 namespace NBTSol
  {
   public partial class Main : Form
   {
    public Main()
    {
        InitializeComponent();
    }

    private void Main_Load(object sender, EventArgs e)
    {
        ContactDbContext db = new ContactDbContext();
        Person person = new Person();
        db.Persons.Add(person);
    }
  }
}

Answer 1

在您的数据库上下文中将Person属性设为公共，如下所示，它将起作用。

public DbSet<Person> Persons { get; set; }

使用以下代码替换ContactDbContext类：

public class ContactDbContext: DbContext {
 public ContactDbContext(): base("name=DefaultConnection") {}

 public DbSet < Person > Persons {
  get;
  set;
 }

 protected override void OnModelCreating(DbModelBuilder modelBuilder) {
  //Configure domain classes using Fluent API here

  //Configure table name
  modelBuilder.Entity<Persons>()
  .ToTable("Persons ");

  base.OnModelCreating(modelBuilder);
 }
}

错误：NBTSol.Models.ContactDbContext.Persons由于其保护级别而无法访问-C＃

1 个答案: