Fix #803: Use C# 9 relational patterns for VB Case Is <op> constant#1251
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Fix #803: Use C# 9 relational patterns for VB Case Is <op> constant#1251GrahamTheCoder wants to merge 2 commits intoicsharpcode:masterfrom
Case Is <op> constant#1251GrahamTheCoder wants to merge 2 commits intoicsharpcode:masterfrom
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…> constant` When converting VB `Select Case` with `Case Is < value`, `Case Is > value`, etc. (RelationalCaseClauseSyntax), emit clean C# 9 relational patterns (`case < 1000:`) instead of the verbose `case var @case when @case < 1000:` pattern, for non-object, non-string comparisons where the case value is a constant expression. Also handle RelationalPatternSyntax in the C#→VB converter so that C# 9 relational patterns round-trip correctly back to VB `Case Is <op> value`. https://claude.ai/code/session_01AkwUvu3XuCdj3D4axoX4UX
…avoid VB extension method resolution https://claude.ai/code/session_01AkwUvu3XuCdj3D4axoX4UX
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Apr 14, 2026
| CS.SyntaxKind.GreaterThanEqualsToken => (SyntaxKind.CaseGreaterThanOrEqualClause, SyntaxKind.GreaterThanEqualsToken), | ||
| _ => throw new NotSupportedException($"Relational operator token {csTokenKind} not supported in VB case clause") | ||
| }; | ||
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Implementation in C# -> VB direction with no test
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Fixes #803
When converting VB
Select CasewithCase Is < value,Case Is > value, etc. (RelationalCaseClauseSyntax), emit clean C# 9 relational patterns (case < 1000:) instead of the verbosecase var @case when @case < 1000:pattern, for non-object, non-string comparisons where the case value is a constant expression.Also handle RelationalPatternSyntax in the C#→VB converter so that C# 9 relational patterns round-trip correctly back to VB
Case Is <op> value.https://claude.ai/code/session_01AkwUvu3XuCdj3D4axoX4UX