Use OSPath.PathComparer in StaticWebAssetEndpoint.ToAssetFileDictionary#54749
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jankratochvilcz merged 3 commits intoJun 18, 2026
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Pull request overview
Fixes a Windows path-casing bug in StaticWebAssetEndpoint.ToAssetFileDictionary by using the repo’s OS-aware path comparer (OSPath.PathComparer) when grouping endpoints by absolute filesystem path.
Changes:
- Add a Windows-only unit test verifying that endpoints whose
AssetFilediffers only by casing are grouped into a single dictionary entry. - Construct the
AssetFiledictionary withOSPath.PathComparerto match Windows’ case-insensitive filesystem behavior (while preserving ordinal behavior on Unix).
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Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.
| File | Description |
|---|---|
| test/Microsoft.NET.Sdk.StaticWebAssets.Tests/StaticWebAssets/StaticWebAssetEndpointToAssetFileDictionaryTest.cs | Adds a regression test covering case-insensitive grouping of AssetFile keys on Windows. |
| src/StaticWebAssetsSdk/Tasks/Data/StaticWebAssetEndpoint.cs | Uses OSPath.PathComparer when building the AssetFile-keyed dictionary to avoid casing-related lookup misses on Windows. |
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…sitively on Windows StaticWebAssetEndpoint.ToAssetFileDictionary builds its keying dictionary with the default ordinal comparer (StaticWebAssetEndpoint.cs:178). On Windows the filesystem is case-insensitive, but two endpoints whose AssetFile values differ only in casing (e.g. 'C:\Repo\WWWRoot\site.css' vs 'c:\repo\wwwroot\site.css') currently land in separate buckets. This makes downstream lookups such as ApplyCompressionNegotiation's endpointsByAsset.TryGetValue(compressedAsset.Identity, ...) silently miss when MSBuild round-trips path casing differently between producers (ResolveProjectReferences vs DefineStaticWebAssets, etc.), dropping the related-asset's endpoint from compression-negotiation processing. Sibling SWA dictionaries (GeneratePackageAssetsManifestFile.cs:92, UpdatePackageStaticWebAssets.cs:46) pass Utils.OSPath.PathComparer for exactly this reason. The test is Windows-only because OSPath.PathComparer is OrdinalIgnoreCase only on Windows; on Linux/macOS it is StringComparer.Ordinal (matching the case-sensitive filesystem), which is observationally identical to the default Dictionary comparer. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Fixes the previously failing GroupsEndpoints_ByPath_CaseInsensitively_OnWindows test by passing Utils.OSPath.PathComparer (OrdinalIgnoreCase on Windows, Ordinal on Linux/macOS) to the keying dictionary so AssetFile path lookups match the OS filesystem semantics, consistent with sibling SWA dictionaries (GeneratePackageAssetsManifestFile.cs:92, UpdatePackageStaticWebAssets.cs:46). Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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Fixes a latent path-comparer bug in
StaticWebAssetEndpoint.ToAssetFileDictionary(src/StaticWebAssetsSdk/Tasks/Data/StaticWebAssetEndpoint.cs:178). The dictionary keys are absolute filesystem paths (endpoint.AssetFile, typically populated via MSBuild's%(FullPath)modifier), but the dictionary was constructed without a comparer — defaulting to ordinal case-sensitive on all platforms.Impact
On Windows the filesystem is case-insensitive, so two endpoints whose
AssetFilevalues differ only in casing (e.g.C:\Repo\WWWRoot\site.cssvsc:\repo\wwwroot\site.css) land in separate buckets. This makes downstream lookups such asApplyCompressionNegotiation'sendpointsByAsset.TryGetValue(compressedAsset.Identity, …)silently miss when MSBuild round-trips path casing differently between producers (e.g.ResolveProjectReferencesvsDefineStaticWebAssets), dropping the related-asset's endpoint from compression-negotiation processing.Sibling SWA dictionaries pass
Utils.OSPath.PathComparerfor exactly this reason — seeGeneratePackageAssetsManifestFile.cs:92andUpdatePackageStaticWebAssets.cs:46.Changes (TDD)
Add failing test— addsStaticWebAssetEndpointToAssetFileDictionaryTest.GroupsEndpoints_ByPath_CaseInsensitively_OnWindows, a Windows-onlyPlatformSpecificFactthat asserts case-divergentAssetFilevalues share a single dictionary entry. Fails onmain(default ordinal comparer).Fix— passOSPath.PathComparer(OrdinalIgnoreCaseon Windows,Ordinalon Linux/macOS) to theDictionary<string, List<StaticWebAssetEndpoint>>constructor.The test is Windows-only because
OSPath.PathComparerisOrdinalIgnoreCaseonly on Windows; on Linux/macOS it isStringComparer.Ordinal(matching the case-sensitive filesystem), which is observationally identical to the defaultDictionarycomparer.Found during MT-safety audit of #54703.