If you truly need different navigation links on different pages then I think you should specify different layouts pages on these separate pages. These different layouts should then specify your _layout as their layout, making it the master layout
Ex:
_navlinks1.cshtml
@{
Layout = "_layout"
}
@RenderBody()
@section navlinks
{
@*create navlinks specific to current page*@
}
Then in your _layout page you can put @RenderSection("navlinks", false)
where you want the navigation links to go.
But, if for some reason you need a distinct set of navigation links for every single page, then putting navigation links in your layout might not make sense. Might be better off having all your models inherit a base model with a list of items containing navigation link data. Then call a partial view that processes this data into the correct links in your views.