Suggest that variable with name "page" can't be used in an chstml file

[vsfeedback]

This issue has been moved from a ticket on Developer Community.

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In asp.net core project, cshtml file,
if you have this code:
{
var page = 1;
}
@page

You'll get all kinds of errors, because @page is a reserved word.
As long as you don't try calling @page you're actually fine.

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Original Comments

Feedback Bot on 2/8/2024, 05:40 PM:

(private comment, text removed)

[davidwengier]

For the actual issue, that there be a suggestion to not use "page" as a variable, I'm not sure where this goes. I don't think the compiler can do this, as it doesn't understand the C# code. Tooling can't for the same reason. I think this would need an analyzer that looks at the generated code, but so far those all live in the aspnetcore repo: https://github.com/dotnet/aspnetcore/tree/502417e57c9bf7139114de7780d7efc5c0e1b588/src/Components/Analyzers/src

What do you think though @chsienki ? Perhaps this actually a compiler bug that it reports "all kinds of errors", and @page should only ever mean a directive in Razor files? Referring to page in a C# context would still be allowed presumably. Or is that harder than it sounds due to at-escaping in C# being possible?

[chsienki]

Yeah, I think to warn we would need an analyzer. Infrastructurally thats not too hard, as we already have the generator, so we could just add an analyzer to MS.CA.Razor.Compiler and it would get picked up.

@jjonescz Can you look at the second part and if there's anything we can do to make the experience better?

[jjonescz]

I cannot reproduce this - I see exactly one error. And it looks good:

error RZ3906: The '@page' directive must precede all other elements defined in a Razor file. 

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