解决：无法检索“mvc4.Models.Movie”的元数据。The connection string in the application's configuration file does not contain the required providerName attribute问题

asp.net mvc4添加控制器用到【MovieContext】数据上下文类，出现【无法检索“mvc4.Models.Movie”的元数据。The connection string 'MovieContext' in the application's configuration file does not contain the required providerName attribute."】的问题，解决方法是发现web.config中的

  <connectionStrings>

    <!--注意这里的名称要和数据库的类名称一致，即MovieContext.cs的类名一致-->

    <add name="MovieContext" connectionString="Data Source=.;Initial Catalog=MovieDB;Persist Security Info=True;User ID=sa;password=Adminsa2013" providerName="System.Data.SqlClient" />

</connectionStrings>

缺少providerName="System.Data.SqlClient"属性所致，添加后即可正常运行