如何解决以下代码的错误?
namespace Phonebook
{
using System;
using System.Data.Entity;
14- using System.Data.Entity.Infrastructure;
17- public partial class ContactsEntities : DbContext
{
public ContactsEntities()
20- : base("name=ContactsEntities")
{
}
24- protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
throw new UnintentionalCodeFirstException();
}
public virtual DbSet<Tbl_Contacts> Tbl_Contacts { get; set; }
public class DbSet<T>
{
internal object Tolist;
}
}
}
错误CS0115'ContactsEntities.OnModelCreating(DbModelBuilder)':找不到合适的方法来覆盖电话簿C:\ Users \ PC \ Desktop \ Phonebook \ Phonebook \ ModelContacts.Context.cs 24
错误CS0234命名空间“System.Data.Entity”中不存在类型或命名空间名称“Infrastructure”(您是否缺少程序集引用?)电话簿C:\ Users \ PC \ Desktop \ Phonebook \ Phonebook \ ModelContacts.Context。 cs 14
错误CS0246找不到类型或命名空间名称'DbModelBuilder'(您是否缺少using指令或程序集引用?)电话簿C:\ Users \ PC \ Desktop \ Phonebook \ Phonebook \ ModelContacts.Context.cs 24
错误CS0246找不到类型或命名空间名称'DbContext'(您是否缺少using指令或程序集引用?)电话簿C:\ Users \ PC \ Desktop \ Phonebook \ Phonebook \ ModelContacts.Context.cs 17
错误CS1729'DbContext'不包含带1个参数的构造函数电话簿C:\ Users \ PC \ Desktop \ Phonebook \ Phonebook \ ModelContacts.Context.cs 20
我的问题已经解决:
我在Visual Studio中为Nuget包添加了Entity Framework,在控制面板中我执行了'Powershell'设置。