The instance of entity type 'manager' cannot be tracked because another instance with the same key value for {'id'} is already being tracked. When attaching existing entities, ensure that only one ent

最近在用ASP.NET CORE时遇到一些问题，现记录下：

出现上述错误，即在更新实体数据时出现的错误

services.AddDbContext<StoreContext>(c =>

            c.UseInMemoryDatabase(Guid.NewGuid().ToString()).UseQueryTrackingBehavior(QueryTrackingBehavior.NoTracking));