Fix DNS-invalid hostnames with underscores in dotnet new templates#64988

Merged

DamianEdwards merged 10 commits intomainfrom

copilot/fix-dns-names-underscore-issue

Jan 10, 2026

Commits on Jan 9, 2026

Initial plan
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Add DNS-safe hostname forms and symbols to templates

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Add trimming of leading/trailing hyphens for DNS-safe hostnames

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Use distinct placeholder LocalhostTldHostNamePrefix for hostname replacement

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Add tests for DNS-compliant hostname generation with --localhost-tld

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Add tests for DNS-compliant hostname generation in Blazor templates

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Move VerifyDnsCompliantHostname to shared Project class

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Fix -n parameter conflict and add tests with numbers in project names

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Refactor DNS hostname tests to use Theory with InlineData

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Commits on Jan 10, 2026

Fix razorcomponent item test
DamianEdwards
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