C#: Improve BMN feed checking & handling.#21684

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michaelnebel wants to merge 20 commits intogithub:mainfrom

michaelnebel:csharp/improve-reachability-checks

Commits on Apr 9, 2026

Refactor `GetReachableNuGetFeeds` out of `GetReachableFallbackNugetFeeds`

mbg
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michaelnebel
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Use `GetReachableNuGetFeeds` in `CheckSpecifiedFeeds`

mbg
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michaelnebel
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Inline `CheckFeeds`

mbg
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michaelnebel
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Use `explicitFeeds` directly

mbg
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michaelnebel
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Divide up `CheckSpecifiedFeeds`

mbg
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michaelnebel
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Check reachability of inherited feeds

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Only use reachable feeds when private registries are configured

mbg
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michaelnebel
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C#: Turn checkNugetFeedResponsiveness into a field and remove some explicit this qualifiers.
michaelnebel
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C#: Add private registries to the set of explicit feeds. Always use specific sources for restoring if private registries are used of if nuget feed reachability check is performed.
michaelnebel
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C#: Make sure that the feeds that excluded for the feed check (based on an environment variable setting) are still used as sources.
michaelnebel
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C#: Remove redundant out parameter from CheckSpecifiedFeeds.
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C#: Address review comments.
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C#: Re-add the compilation information on reachable fallback NuGet feed count.
michaelnebel
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