由于蒂姆·唐曾表示，如果使用的是实体框架6，你需要使用连接器/ NET 6.8.x.
你也应该加入到MySql.Data.Entity.EF6一个参考给你的项目。

As Tim Tang has stated, if you are using Entity Framework 6 for you need to use Connector/NET 6.8.x. You should also add a reference to the MySql.Data.Entity.EF6 to you project.

那么对于你的web.config文件中，这样的事情：

Then for your Web.config file, something like this:

 <entityFramework>
    <providers>
      <provider invariantName="MySql.Data.MySqlClient" 
                type="MySql.Data.MySqlClient.MySqlProviderServices, MySql.Data.Entity.EF6" />
    </providers>
  </entityFramework>
  <system.data>
    <DbProviderFactories>
      <remove invariant="MySql.Data.MySqlClient"></remove>
      <add name="MySQL Data Provider" 
           invariant="MySql.Data.MySqlClient" 
           description=".Net Framework Data Provider for MySQL" 
           type="MySql.Data.MySqlClient.MySqlClientFactory, MySql.Data,  Version=6.8.3.0, Culture=neutral, PublicKeyToken=c5687fc88969c44d" />
    </DbProviderFactories>
  </system.data>

看的这，获取更多详情。