例外：不支持关键字：元数据

Question

尝试执行Roles.AddUserToRole（username，rolename）时出现上述错误

这是我的连接字符串

<add name="HelpDeskEntities" connectionString="metadata=res://*/DBModel.csdl|res://*/DBModel.ssdl|res://*/DBModel.msl;provider=System.Data.SqlClient;provider connection string=&quot;data source=(LocalDb)\MSSQLLocalDB;attachdbfilename=|DataDirectory|\aspnet-desteahelpdesk-20180515114739.mdf;initial catalog=aspnet-desteahelpdesk-0180515114739;integrated security=True;multipleactiveresultsets=True;application name=EntityFramework&quot;" providerName="System.Data.EntityClient" />