为服务层设计DI（构造函数注入）的存储库

I'm building an MVC3 app, trying to use IoC and constructor injection. My database has (so far) about 50 tables. I am using EF4 (w/ POCO T4 template) for my DAC code. I am using the repository pattern, and each table has its own repository. My service classes in my service layer are injected w/ these repositories.I'm building an MVC3 app, trying to use IoC and