Enhancements on LinkGenerator and TemplateBinder

[yang-er]

Is your feature request related to a problem? Please describe.

Ambient Value Invalidation is one of breaking changes from Endpoint Routing.

With the current algorithm, anchor links for /[area=project]/{projectid}/[controller=...]/[action=...] is more complicated. I have to attach asp-route-projectid="some..." to each tag.

After I read the source code for Microsoft.AspNetCore.Routing.Template.TemplateBinder, I found that if projectid can be added into _requiredKeys, this problem will no longer exists.

Describe the solution you'd like

Create a new Attribute for Endpoint Metadata, which contains the route tokens to add into _requiredKeys. And when generating TemplateBinders, use these attributes to build that array.

Additional context

Well, if I make the _requiredKeys an empty array through reflection, it will become the behavior in ASP.NET Core 2.1 and earlier. Maybe an alternative compatibility property in MvcOptions also works? This really slow down my work for upgrading to ASP.NET Core 3.x. And the solution in the second section doesn't really bother the Endpoint Routing system.

[mkArtakMSFT]

Thanks for contacting us, @yang-er.
This is not something we plan to do as we've intentionally stepped away from that model.
/cc @rynowak

[ghost]

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