https://github.com/dotnet/corefx 这个是.net core的 开源项目地址
https://github.com/aspnet 这个下面是asp.net core 框架的地址，里面有很多仓库。
https://github.com/aspnet/EntityFrameworkCore EF Core源码
https://github.com/aspnet/Configuration 配置模块源码
https://github.com/aspnet/Routing 路由模块
https://github.com/aspnet/Security 认证及授权
https://github.com/aspnet/DependencyInjection 依赖注入
https://github.com/aspnet/HttpAbstractions 这个一定要看，有很多的一些HTTP管道的抽象接口都定义在这里
https://github.com/aspnet/Options 看名字
https://github.com/aspnet/Mvc
https://github.com/aspnet/Hosting