c# - 去年迁移有效，但现在不行了

Question

迁移去年有效，但现在不行了，我该怎么办？

错误:

PM> update-database
Specify the '-Verbose' flag to view the SQL statements being applied to the target database. System.Runtime.Serialization.SerializationException: O tipo não foi resolvido para o associado 'MySql.Data.MySqlClient.MySqlException,MySql.Data, Version=6.9.8.0, Culture=neutral, PublicKeyToken=c5687fc88969c44d'. em System.AppDomain.DoCallBack(CrossAppDomainDelegate callBackDelegate)
em System.Data.Entity.Migrations.Design.ToolingFacade.Run(BaseRunner runner) em System.Data.Entity.Migrations.Design.ToolingFacade.Update(String targetMigration, Boolean force) em System.Data.Entity.Migrations.UpdateDatabaseCommand.<>c__DisplayClass2.<.ctor>b__0() em System.Data.Entity.Migrations.MigrationsDomainCommand.Execute(Action command) The type has not been resolved to the associated 'MySql.Data.MySqlClient.MySqlException,MySql.Data, Version=6.9.8.0, Culture=neutral, PublicKeyToken=c5687fc88969c44d'.
PM>

代码(部分)

<configuration>
  <configSections>
        <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="DefaultConnection" connectionString="Data Source=mySERVER;initial catalog=myDB;Integrated Security=false;uid=myID;pwd=myPWD;"  providerName="System.Data.SqlClient"/>
  </connectionStrings>
  <appSettings>
  <!-- I will show only if needed -->
  </appSettings>
  <system.web>
  <!-- I will show only if needed -->
  </system.web>
  <system.webServer>
    <modules>
      <!-- I will show only if needed -->
    </modules>

    <handlers>

       <!-- I will show only if needed -->
    </handlers>
 </system.webServer>
  <runtime>
  <!-- I will show only if needed -->
  </runtime>
  <system.data>
   <DbProviderFactories>
    <!-- I will show only if needed -->
   </DbProviderFactories>
  </system.data>

  <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" />
    </providers>
    <defaultConnectionFactory type="System.Data.Entity.Infrastructure.SqlConnectionFactory, EntityFramework" />
  </entityFramework>

Answer 1

配置文件中的唯一连接字符串似乎指向以“System.Data.SqlClient”作为唯一提供者的服务器； ...堆栈跟踪对 MySQL 表示不满。

我猜你需要提供一个支持MySQL的。

但我要指出的是，我没有在同一个项目中与多个提供商合作:)