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Warn when an @ is optional in an attribute value #9740

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davidwengier opened this issue Dec 19, 2023 · 4 comments · May be fixed by #10346
Open

Warn when an @ is optional in an attribute value #9740

davidwengier opened this issue Dec 19, 2023 · 4 comments · May be fixed by #10346
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area-compiler Umbrella for all compiler issues untriaged
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@davidwengier
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See dotnet/aspire#1449 for context, but in general there is code like:

<Component OnSomeEvent="DoSomething(context)" />

and the user changed it to:

<Component OnSomeEvent="@DoSomething(context)" />

This seemed to have no effect, but nobody is really sure what the rules are for whether the @ is necessary in this context or not. It would be great if the compiler could warn when it expects a C# expression, and encounters a C# implicit expression.
@davidwengier davidwengier added the area-compiler Umbrella for all compiler issues label Dec 19, 2023
@ghost ghost added the untriaged label Dec 19, 2023
@davidwengier davidwengier mentioned this issue Dec 19, 2023
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@chsienki chsienki added this to the 17.10 Planning milestone Feb 10, 2024
@chsienki
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@jjonescz Please take a look, thanks

@jjonescz
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jjonescz commented Feb 21, 2024 •
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We would need warning waves to avoid breaking users. (Another case where we need them: #9144)

Also feels like a question for language design whether we want this or not.

@jjonescz
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@chsienki I'm not sure if you want me to work on this given what I've written above

@chsienki
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@jjonescz Can you open an issue on the razor LDM for warning waves (if we don't already have one?) and start the email thread to discuss it? Seems like something we probably want to do.

@jjonescz jjonescz linked a pull request May 6, 2024 that will close this issue
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@chsienki chsienki modified the milestones: 17.10 Planning, Backlog Jul 11, 2024
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Add warning wave support and warn for unnecessary @ in component parameters jjonescz/razor
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@davidwengier @jjonescz @chsienki