Alternative for Environment TagHeper domain

@vkichline

From @vkichline on October 8, 2015 22:32

I see this pattern in the Web Application template's _ValidationScriptsPartial.cshtml:

<environment names="Development">
       …
</environment>
<environment names="Staging,Production">
       …
</environment>

This pattern above seems brittle; if I add a new environment setting, I have a lot of searching and modification to do.

I wish I had something like:

<environment names="Development">
       …
</environment>
<environment names="!Development">
       …
</environment>

…or:

<environment names="Development">
       …
<else>
       …
</environment>

Copied from original issue: aspnet/Razor#567

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