Support duplicate named parameters in logging message templates#124257

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Copilot wants to merge 15 commits intomainfrom

copilot/fix-logger-message-parameter-issue

Commits on Feb 11, 2026

Initial plan
Copilot
committed
Fix LogValuesFormatter and LoggerMessageGenerator to support duplicate placeholders

Copilot
and
rosebyte
committed
Add comprehensive tests for duplicate placeholder support

Copilot
and
rosebyte
committed
Optimize LogValuesFormatter to use Dictionary for O(1) lookups

Copilot
and
rosebyte
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Optimize LoggerMessageGenerator.Parser to use Dictionary for O(1) lookups

Copilot
and
rosebyte
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Refine LoggerMessageGenerator.Parser to match LogValuesFormatter pattern

Copilot
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rosebyte
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Optimize placeholder lookup to avoid Dictionary for small templates

Copilot
and
rosebyte
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Fix backward compatibility: preserve validation for non-duplicate parameter mismatches

Copilot
and
stephentoub
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Simplify CreateLogValuesFormatter validation logic

Copilot
and
tarekgh
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Use OrdinalIgnoreCase for placeholder deduplication to match source generator

Copilot
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tarekgh
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Add source generator tests for duplicate template names with different casing

Copilot
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tarekgh
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Add case-insensitive duplicate tests for LoggerMessage.Define and FormattedLogValues

Copilot
and
tarekgh
committed
Merge branch 'main' into copilot/fix-logger-message-parameter-issue
tarekgh
authored
Remove Arrange/Act/Assert comments from new tests

Copilot
and
tarekgh
committed
Revert to strict equality validation for CreateLogValuesFormatter

Copilot
and
tarekgh
committed