AutoMapper和实体框架dbcontext的映射属性

Question

我对AutoMapper有点新，我试图映射一个属性，其中来自ef db context的值。

我将如何做到这一点？

CreateMap<User, UserDto>()
.ForMember(dest => dest.Username, opt => opt.MapFrom(src => src.Username))
.ForMember(dest => dest.NetworkId, opt => opt.MapFrom(src => src.NetworkId))
.ForMember(dest => dest.Network, /*NEED TO TAKE NetworkId and PERFORM A lookup in DbContext AND SET Network property*/);