[Foundation] Improve NSArray.FromStrings a bit. #24583

rolfbjarne · 2026-01-29T22:56:17Z

Enable nullability.
Reuse existing code to create the native array.
Add tests.
Add xml docs.
Update nullability in some of the consumers of these methods whenever it makes sense.
Adjust CFArray.Create|FromStrings methods to match NSArray's equivalent methods.

Contributes towards #17285.

* Enable nullability. * Reuse existing code to create the native array. * Add tests. * Add xml docs. * Update nullability in some of the consumers of these methods whenever it makes sense. * Adjust CFArray.Create|FromStrings methods to match NSArray's equivalent methods. Contributes towards #17285.

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Pull request overview

This PR improves the NSArray.FromStrings methods and related CFArray methods by enabling nullability, adding better XML documentation, improving the implementation to reuse existing code, and adding comprehensive tests.

Changes:

Enabled nullability in NSArray.FromStrings and added a new FromNullableStrings method for nullable array inputs
Refactored NSArray.FromStrings to reuse CFArray.Create, eliminating duplicated marshaling logic
Updated CFArray.Create and FromStrings to accept nullable strings with proper documentation
Updated consumers (NSSet, NSOrderedSet, NSMutableSet) to accept nullable string arrays
Added comprehensive tests for both NSArray and CFArray with null items

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/Foundation/NSArray.cs	Refactored FromStrings to delegate to CFArray.Create, added FromNullableStrings method, improved XML docs, enabled nullability
src/CoreFoundation/CFArray.cs	Enhanced Create method with IReadOnlyList overload, updated FromStrings signature, added XML documentation
tests/monotouch-test/Foundation/ArrayTest.cs	Added tests for FromStrings with null items, IReadOnlyList, and FromNullableStrings
tests/monotouch-test/CoreFoundation/ArrayTest.cs	Added tests for Create and FromStrings with null items and IReadOnlyList
src/bgen/Generator.cs	Updated generator to use FromNullableStrings for nullable string arrays
src/Foundation/NSSet.cs	Updated constructor to accept nullable string arrays
src/Foundation/NSOrderedSet.cs	Updated constructors to accept nullable string arrays
src/Foundation/NSMutableSet.cs	Updated constructor to accept nullable string arrays
src/CoreText/CTFont.cs	Updated GetDefaultCascadeList to use FromNullableStrings
src/CoreServices/FSEvents.cs	Fixed logic to properly check for null before checking Count

…ullability-44-nsarray-fromstrings

vs-mobiletools-engineering-service2 · 2026-01-30T17:21:13Z

✅ [PR Build #2ee33b6] Build passed (Detect API changes) ✅

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Hash: 2ee33b6ce4cbce754bacdec0a1df87e5ab3b2ff3 [PR build]

vs-mobiletools-engineering-service2 · 2026-01-30T17:22:36Z

✅ [CI Build #2ee33b6] Build passed (Build packages) ✅

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Hash: 2ee33b6ce4cbce754bacdec0a1df87e5ab3b2ff3 [PR build]

vs-mobiletools-engineering-service2 · 2026-01-30T17:59:14Z

✅ API diff for current PR / commit

NET (empty diffs)

iOS: vsdrops gist ( No breaking changes )
tvOS: vsdrops gist ( No breaking changes )
MacCatalyst: vsdrops gist ( No breaking changes )
macOS: vsdrops gist ( No breaking changes )

✅ API diff vs stable

NET (empty diffs)

iOS: vsdrops gist ( No breaking changes )
tvOS: vsdrops gist ( No breaking changes )
MacCatalyst: vsdrops gist ( No breaking changes )
macOS: vsdrops gist ( No breaking changes )

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Generator Diff: vsdrops (html) vsdrops (raw diff) gist (raw diff) - Please review changes)

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Hash: 2ee33b6ce4cbce754bacdec0a1df87e5ab3b2ff3 [PR build]

vs-mobiletools-engineering-service2 · 2026-01-30T18:21:55Z

✅ [CI Build #2ee33b6] Build passed (Build macOS tests) ✅

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Hash: 2ee33b6ce4cbce754bacdec0a1df87e5ab3b2ff3 [PR build]

vs-mobiletools-engineering-service2 · 2026-01-30T18:36:06Z

💻 [CI Build #2ee33b6] Tests on macOS M1 - Mac Monterey (12) passed 💻

✅ All tests on macOS M1 - Mac Monterey (12) passed.

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Hash: 2ee33b6ce4cbce754bacdec0a1df87e5ab3b2ff3 [PR build]

vs-mobiletools-engineering-service2 · 2026-01-30T18:36:27Z

💻 [CI Build #2ee33b6] Tests on macOS arm64 - Mac Sequoia (15) passed 💻

✅ All tests on macOS arm64 - Mac Sequoia (15) passed.

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Hash: 2ee33b6ce4cbce754bacdec0a1df87e5ab3b2ff3 [PR build]

vs-mobiletools-engineering-service2 · 2026-01-30T18:37:33Z

💻 [CI Build #2ee33b6] Tests on macOS M1 - Mac Ventura (13) passed 💻

✅ All tests on macOS M1 - Mac Ventura (13) passed.

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Hash: 2ee33b6ce4cbce754bacdec0a1df87e5ab3b2ff3 [PR build]

vs-mobiletools-engineering-service2 · 2026-01-30T18:38:09Z

💻 [CI Build #2ee33b6] Tests on macOS arm64 - Mac Tahoe (26) passed 💻

✅ All tests on macOS arm64 - Mac Tahoe (26) passed.

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Hash: 2ee33b6ce4cbce754bacdec0a1df87e5ab3b2ff3 [PR build]

vs-mobiletools-engineering-service2 · 2026-01-30T18:44:48Z

💻 [CI Build #2ee33b6] Tests on macOS X64 - Mac Sonoma (14) passed 💻

✅ All tests on macOS X64 - Mac Sonoma (14) passed.

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Hash: 2ee33b6ce4cbce754bacdec0a1df87e5ab3b2ff3 [PR build]

vs-mobiletools-engineering-service2 · 2026-01-30T20:01:59Z

🔥 [CI Build #2ee33b6] Test results 🔥

Test results

❌ Tests failed on VSTS: test results

4 tests crashed, 5 tests failed, 113 tests passed.

Failures

❌ dotnettests tests (iOS)

1 tests failed, 0 tests passed.

Failed tests

DotNet tests: Failed (Execution failed with exit code 1)
- Xamarin.Tests.AppSizeTest.MonoVM_Interpreter(iOS,"ios-arm64"): App size changed significantly (+14,384 bytes (14.0 KB = 0.0 MB) different > tolerance of +-10,240 bytes (10.0 KB = 0.0 MB)). Ex...
- Xamarin.Tests.AppSizeTest.MonoVM(iOS,"ios-arm64"): App size changed significantly (+42,640 bytes (41.6 KB = 0.0 MB) different > tolerance of +-10,240 bytes (10.0 KB = 0.0 MB)). Ex...
- Xamarin.Tests.AppSizeTest.NativeAOT(iOS,"ios-arm64"): App size changed significantly (+14,640 bytes (14.3 KB = 0.0 MB) different > tolerance of +-10,240 bytes (10.0 KB = 0.0 MB)). Ex...

Html Report (VSDrops) Download

❌ dotnettests tests (tvOS)

🔥 Failed catastrophically on VSTS: test results - dotnettests_tvos (no summary found).

Html Report (VSDrops) Download

❌ framework tests

🔥 Failed catastrophically on VSTS: test results - framework (no summary found).

Html Report (VSDrops) Download

❌ fsharp tests

1 tests failed, 3 tests passed.

Failed tests

fsharp/tvOS - simulator/Debug: Crashed

Html Report (VSDrops) Download

❌ generator tests

🔥 Failed catastrophically on VSTS: test results - generator (no summary found).

Html Report (VSDrops) Download

❌ interdependent-binding-projects tests

🔥 Failed catastrophically on VSTS: test results - interdependent-binding-projects (no summary found).

Html Report (VSDrops) Download

❌ monotouch tests (iOS)

1 tests failed, 10 tests passed.

Failed tests

monotouch-test/iOS - simulator/Release (NativeAOT, ARM64): Crashed

Html Report (VSDrops) Download

❌ monotouch tests (macOS)

1 tests failed, 11 tests passed.

Failed tests

monotouch-test/macOS/Release (static registrar, all optimizations): TimedOut (Execution timed out after 1200 seconds.
Test run crashed)

Html Report (VSDrops) Download

❌ monotouch tests (tvOS)

1 tests failed, 10 tests passed.

Failed tests

monotouch-test/tvOS - simulator/Debug (managed static registrar): Crashed

Html Report (VSDrops) Download

Successes

✅ cecil: All 1 tests passed. Html Report (VSDrops) Download
✅ dotnettests (MacCatalyst): All 1 tests passed. Html Report (VSDrops) Download
✅ dotnettests (macOS): All 1 tests passed. Html Report (VSDrops) Download
✅ dotnettests (Multiple platforms): All 1 tests passed. Html Report (VSDrops) Download
✅ introspection: All 6 tests passed. Html Report (VSDrops) Download
✅ linker: All 44 tests passed. Html Report (VSDrops) Download
✅ monotouch (MacCatalyst): All 15 tests passed. Html Report (VSDrops) Download
✅ msbuild: All 2 tests passed. Html Report (VSDrops) Download
✅ windows: All 3 tests passed. Html Report (VSDrops) Download
✅ xcframework: All 4 tests passed. Html Report (VSDrops) Download
✅ xtro: All 1 tests passed. Html Report (VSDrops) Download

Pipeline on Agent
Hash: 2ee33b6ce4cbce754bacdec0a1df87e5ab3b2ff3 [PR build]

…romstrings

rolfbjarne requested a review from Copilot January 29, 2026 22:56

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rolfbjarne added 2 commits January 30, 2026 17:20

[tests] Update known sizes.

050ead8

Merge remote-tracking branch 'origin/main' into dev/rolf/foundation-n…

2ee33b6

…ullability-44-nsarray-fromstrings

[tests] Update expected sizes.

64b7f6f

rolfbjarne marked this pull request as ready for review January 31, 2026 01:06

Merge branch 'main' into dev/rolf/foundation-nullability-44-nsarray-f…

189051e

…romstrings

rolfbjarne enabled auto-merge (squash) January 31, 2026 01:07

[Foundation] Improve NSArray.FromStrings a bit. #24583

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vs-mobiletools-engineering-service2 commented Jan 30, 2026

✅ [PR Build #2ee33b6] Build passed (Detect API changes) ✅

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vs-mobiletools-engineering-service2 commented Jan 30, 2026

✅ [CI Build #2ee33b6] Build passed (Build packages) ✅

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vs-mobiletools-engineering-service2 commented Jan 30, 2026

✅ API diff for current PR / commit

✅ API diff vs stable

ℹ️ Generator diff

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vs-mobiletools-engineering-service2 commented Jan 30, 2026

✅ [CI Build #2ee33b6] Build passed (Build macOS tests) ✅

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vs-mobiletools-engineering-service2 commented Jan 30, 2026

💻 [CI Build #2ee33b6] Tests on macOS M1 - Mac Monterey (12) passed 💻

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vs-mobiletools-engineering-service2 commented Jan 30, 2026

💻 [CI Build #2ee33b6] Tests on macOS arm64 - Mac Sequoia (15) passed 💻

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vs-mobiletools-engineering-service2 commented Jan 30, 2026

💻 [CI Build #2ee33b6] Tests on macOS M1 - Mac Ventura (13) passed 💻

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vs-mobiletools-engineering-service2 commented Jan 30, 2026

💻 [CI Build #2ee33b6] Tests on macOS arm64 - Mac Tahoe (26) passed 💻

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vs-mobiletools-engineering-service2 commented Jan 30, 2026

💻 [CI Build #2ee33b6] Tests on macOS X64 - Mac Sonoma (14) passed 💻

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vs-mobiletools-engineering-service2 commented Jan 30, 2026

🔥 [CI Build #2ee33b6] Test results 🔥

Test results

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❌ dotnettests tests (iOS)

Failed tests

❌ dotnettests tests (tvOS)

❌ framework tests

❌ fsharp tests

Failed tests

❌ generator tests

❌ interdependent-binding-projects tests

❌ monotouch tests (iOS)

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❌ monotouch tests (macOS)

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❌ monotouch tests (tvOS)

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