Add JsonNamingPolicyAttribute for member-level naming policies in System.Text.Json#124645

Merged

eiriktsarpalis merged 14 commits intomainfrom

copilot/add-member-level-naming-policy

Mar 20, 2026

Commits on Feb 20, 2026

Initial plan
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Add JsonNamingPolicyAttribute with runtime resolver and source generator support

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Fix null naming policy regression and add tests for JsonNamingPolicyAttribute

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Address review: resolve type-level naming policy once per type, handle unresolvable derived attributes in source gen

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Add tests for custom derived JsonNamingPolicyAttribute in both reflection and source gen paths

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Use triple-quote strings and Assert.Equal on full JSON in tests

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eiriktsarpalis
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