Web API 项目报“Unable to resolve service for type ”

Web API 项目报“Unable to resolve service for type ”

Unable to resolve service for type ‘Choice.DAO.MobanRepository.MobanRepository’ while attempting to activate ‘WriterServer.Controllers.MobanController’.

项目中添加仓库类MobanRepository，并在该类中进行对DBContext实现类进行增删改查操作。
原因:未在startup.cs 中的ConfigureServices中添加AddScoped();