解決：無法檢索“mvc4.Models.Movie”的元數據。The connection string in the application's configuration file does not contain the required providerName attribute問題

asp.net mvc4添加控制器用到【MovieContext】數據上下文類，出現【無法檢索“mvc4.Models.Movie”的元數據。The connection string 'MovieContext' in the application's configuration file does not contain the required providerName attribute."】的問題，解決方法是發現web.config中的

  <connectionStrings>

    <!--注意這里的名稱要和數據庫的類名稱一致，即MovieContext.cs的類名一致-->

    <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"屬性所致，添加后即可正常運行