mysql DbProviderFactories.GetFactory失败 解决方法

DbProviderFactories.GetFactory 获取mysql不成功， 添加配置文件

<system.data>

<DbProviderFactories >

<add name="MySQL Data Provider" invariant="MySql.Data.MySqlClient" description=".Net Framework Data Provider for MySQL" type="MySql.Data.MySqlClient.MySqlClientFactory, MySql.Data" />

</DbProviderFactories>

</system.data>