Question

我正在cmd中使用实体框架进行应用程序研究，我正在使用已创建的数据库和连接到Visual Studio的MySql数据库，但是我无法打开应用程序，这在目前很简单，在应用程序代码和错误：

RdiContext.cs

using rdi_musica.core;
using System.Data.Entity;

namespace rdi_musica.infra
{
   public class RdiContext : DbContext
   {
       public DbSet<Usuario> Usuarios { get; set; }
       public DbSet<Genero> Generos { get; set; }
       public DbSet<Banda> Bandas { get; set; }
       public DbSet<Musica> Musicas { get; set; }

   }
}

BandaRepository.cs

using rdi_musica.core;
using System.Linq;

namespace rdi_musica.infra
{
    public class BandaRepository
    {
       RdiContext context = new RdiContext();
       public Banda getBandaById(int Id)
       {
           var b = context.Bandas.Where(x => x.Id == Id).Select(x => x).FirstOrDefault();
           return b;
       }
    }
 }

的App.config

<?xml version="1.0" encoding="utf-8"?>
<configuration>
<configSections>
<!-- For more information on Entity Framework configuration, visit http://go.microsoft.com/fwlink/?LinkID=237468 -->
<section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
</configSections>
<connectionStrings>
  <add name="Default" providerName="MySql.Data.MySqlClient" connectionString="server=localhost;port=3306;database=redeinova_musica;uid=root;password=root"/>
</connectionStrings>
<entityFramework>
   <defaultConnectionFactory type="MySql.Data.Entity.MySqlConnectionFactory, MySql.Data.Entity.EF6" />
   <!--defaultConnectionFactory type="System.Data.Entity.Infrastructure.SqlConnectionFactory, EntityFramework" /-->
   <providers>
     <provider invariantName="MySql.Data.MySqlClient" type="MySql.Data.MySqlClient.MySqlProviderServices, MySql.Data.Entity.EF6"/>
     <!--provider invariantName="System.Data.SqlClient" type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer" /-->
    <!--provider invariantName="MySql.Data.MySqlClient" type="MySql.Data.MySqlClient.MySqlProviderServices, MySql.Data.Entity.EF6, Version=6.9.9.0, Culture=neutral, PublicKeyToken=c5687fc88969c44d"></provider-->
  </providers>
  </entityFramework>
  <system.data>
   <DbProviderFactories>
    <remove invariant="MySql.Data.MySqlClient" />
    <add name="MySQL Data Provider" invariant="MySql.Data.MySqlClient" description=".Net Framework Data Provider for MySQL" type="MySql.Data.MySqlClient.MySqlClientFactory, MySql.Data, Version=6.9.9.0, Culture=neutral, PublicKeyToken=c5687fc88969c44d" />
  </DbProviderFactories>
 </system.data>
</configuration>

错误：

错误转录：

The Entity Framework provider type 
'MySql.Data.MySqlClient.MySqlProviderServices, MySql.Data.Entity.EF6' 
 registered in the application config file for the ADO.NET provider with 
 invariant name 'MySql.Data.MySqlClient' could not be loaded.

项目结构：

Ps：是的，我安装了MySql驱动程序并添加了引用

Answer 1

从第一眼看来，您必须在DbConfigurationTypeAttribute类上设置DbContext才能使用MySQL：

namespace rdi_musica.infra
{
   [DbConfigurationType(typeof(MySql.Data.Entity.MySqlEFConfiguration))]
   public class RdiContext : DbContext
   {
       public DbSet<Usuario> Usuarios { get; set; }
       public DbSet<Genero> Generos { get; set; }
       public DbSet<Banda> Bandas { get; set; }
       public DbSet<Musica> Musicas { get; set; }

   }
}

注意：在使用MySQL连接器版本低于6.8.x的EF 5中，您的数据上下文设置似乎正常，但在带有MySQL连接器版本6.8.x及更高版本的EF 6中，您需要明确设置DbConfigurationType以使用{ {1}}命名空间。

如果仍然不够（即抛出同样的异常），请尝试将MySql.Data.Entity添加到web.config中：

codeConfigurationType

然后移除<entityFramework codeConfigurationType="MySql.Data.Entity.MySqlEFConfiguratio‌n, MySql.Data.Entity.EF6"> ... </entityFramework>元素中的部分DbProviderFactories：

system.data

将 <DbProviderFactories> <remove invariant="MySql.Data.MySqlClient" /> <add name="MySQL Data Provider" invariant="MySql.Data.MySqlClient" description=".Net Framework Data Provider for MySQL" type="MySql.Data.MySqlClient.MySqlClientFactory, MySql.Data, Version=6.9.9.0, Culture=neutral, PublicKeyToken=c5687fc88969c44d" /> </DbProviderFactories>元素内的提供者设置修改为：

entityFramework

参考：

Entity Framework Config File Settings

Entity Framework Code-Based Configuration (MSDN)

类似问题：

No Entity Framework provider found for 'MySql.Data.MySqlClient' ADO.NET provider

Enity Framework With MySQL

实体框架错误与MySql连接字符串

1 个答案: