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Fix confusing syntax in RZ9979 error message for code blocks in attributes #12686

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Fix confusing syntax in RZ9979 error message for code blocks in attributes #12686

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cf7225f
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Copilot Jan 15, 2026
88a2824
Fix confusing attribute syntax error message
Copilot Jan 15, 2026
5a8668b
Fix RZ9979 error message - remove confusing spaces
Copilot Jan 16, 2026
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4 changes: 2 additions & 2 deletions ...crosoft.CodeAnalysis.Razor.Compiler/src/Language/Components/ComponentDiagnosticFactory.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -25,9 +25,9 @@ public static RazorDiagnostic Create_UnsupportedTagHelperDirective(SourceSpan? s

public static readonly RazorDiagnosticDescriptor CodeBlockInAttribute =
new($"{DiagnosticPrefix}9979",
"Code blocks delimited by '@{{...}}' like '@{{ {0} }}' for attributes are no longer supported. " +
"Code blocks delimited by '@{{...}}' like '@{{{0}}}' for attributes are no longer supported. " +
"These features have been changed to use attribute syntax. " +
"Use 'attr=\"@(x => {{... }}\"'.",
"Use 'attr=\"@(x => {{...}}\"'.",
RazorDiagnosticSeverity.Error);

public static RazorDiagnostic Create_CodeBlockInAttribute(SourceSpan? source, string expression)
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