mysql 找不到或无法加载已注册的 .Net Framework Data Provider和Unable to find the requested .Net Framework Data Provider. It may not be installed解决

1. 需要安装 mysql-connector-net-6.7.4.msi

2. 在C盘安装mysql的位置找到三个DLL，复制到Bin文件夹下

3. 在Web.config文件中添加对应配置：

   <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=6.7.4.0, Culture=neutral, PublicKeyToken=c5687fc88969c44d" />
       </DbProviderFactories>
     </system.data>