如果我使用InRequestScope()，那么在哪里执行DBContext.SaveChanges()

I'm developing an ASP.NET MVC 5 Web API application with C#, .NET Framework 4.5.1, Entity Framework 6.1.1 and the latest version of Ninject (I have also installed Ninject.MVC5).I'm developing an ASP.NET MVC 5 Web API applica