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Enforce .NET code formatting: add dotnet format to CI and fix all existing violations#5954

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rginsburg/formatting
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Enforce .NET code formatting: add dotnet format to CI and fix all existing violations#5954
Robbie-Microsoft wants to merge 12 commits intomainfrom
rginsburg/formatting

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@Robbie-Microsoft Robbie-Microsoft commented Apr 27, 2026

Summary

This PR adds automated code formatting enforcement to the MSAL.NET repository — the .NET equivalent of JavaScript's Prettier — using dotnet format, and fixes all pre-existing violations in the core library.

What's Added

CI Enforcement

  • dotnet format --severity info --verify-no-changes added to emplate-prebuild-code-analysis.yaml
  • Every PR will now fail if it introduces formatting violations

Developer Tooling

  • .vscode/settings.json: format-on-save + fix-all for VS Code users
  • .gitignore: allows .vscode/settings.json to be committed
  • CONTRIBUTING.md: new Code Formatting section explaining the tooling

.editorconfig Improvements

  • Added rim_trailing_whitespace = true and charset = utf-8 globally (parity with msal-js Prettier config)
  • Re-enabled VSTHRD110 (unawaited task warning) — was previously silenced
  • Scoped s_ prefix naming rule to private/internal statics only (not public static fields, which use PascalCase per convention)
  • Suppressed rules that produce false positives in multi-target projects (see below)

Violations Fixed (~3,000+ across 700+ files)

Rule Count Description
WHITESPACE ~666 files Indentation, trailing whitespace, blank lines
IDE0090 ~575
ew T() →
ew() target-typed new
IDE0008 ~1,436 Explicit types replacing ambiguous �ar
IDE0290 ~298 Primary constructors
IDE1006 ~382 s_ prefix on static fields, _ on instance fields
CA1859 ~68 Concrete types instead of interface types for performance
CA1860/CA1861/CA1854 various Collection/dictionary best practices
IDE0044/0049/0063/0028/0017/0300/0301/0083/0305/1005/… hundreds Misc style modernization
VSTHRD110 13 Fixed real bugs: 4 were silent test failures (async void test methods whose assertions never ran)

Real Bugs Found and Fixed

Re-enabling VSTHRD110 surfaced 4 genuine test bugs:

  • BrokerRequestTests.cs: 2 �sync void test methods — assertions never executed
  • TokenCacheTests.cs: 2 �sync void test methods — cache saves were never awaited before assertions
  • SeleniumInfrastructureTests.NetFwk.cs: Task.Delay in sync context replaced with Thread.Sleep

Suppressed (False Positives)

Rules suppressed in .editorconfig with comments explaining why:

Rule Reason
CA1866/CA1845/CA1846/CA1850 APIs only available in .NET 5+; project also targets net462/netstandard2.0
CA1510/CA2250/IDE0039 .NET 6+ APIs
CA1512/CA1513 .NET 8+ APIs
IDE0057 Range operator requires System.Index (.NET 5+)
IDE0019/IDE0051/IDE0052 Multi-target #if preprocessor false positives
IDE0130 Flat Microsoft.Identity.Client namespace is intentional public API design
IDE1006 (public statics) Prompt., BrokerResponseConst.iOSBroker — renaming would be a breaking change

Testing

  • dotnet build → 0 errors, 0 warnings
  • dotnet format --verify-no-changes --severity info → exit code 0
  • No behavioral changes — purely formatting and naming conventions

Copilot AI review requested due to automatic review settings April 27, 2026 19:48
@Robbie-Microsoft Robbie-Microsoft requested a review from a team as a code owner April 27, 2026 19:48
Copilot AI reviewed Apr 27, 2026
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Copilot wasn't able to review this pull request because it exceeds the maximum number of files (300). Try reducing the number of changed files and requesting a review from Copilot again.

@Robbie-Microsoft Robbie-Microsoft marked this pull request as draft April 27, 2026 19:56
Robbie-Microsoft and others added 11 commits April 27, 2026 15:58
@Robbie-Microsoft
Add trim_trailing_whitespace, charset, and re-enable VSTHRD110 in .ed…
8daee01 
…itorconfig

- trim_trailing_whitespace = true: matches msal-js editorconfig
- charset = utf-8: makes encoding explicit (compiler default, but documents intent)
- VSTHRD110 warning: re-enable 'Observe result of async calls' to match
  msal-js no-floating-promises enforcement; was previously silently disabled

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
@Robbie-Microsoft
Fix VSTHRD110 violations surfaced by re-enabling the rule
1341bcd 
Six files fixed across src and tests:

MacMainThreadScheduler.cs, WebView2WebUi.cs:
  Intentional fire-and-forget: ContinueWith result discarded via _ =
  since outcomes are propagated through TaskCompletionSource.

SeleniumInfrastructureTests.NetFwk.cs:
  Bug: Task.Delay() in Action<IWebDriver> lambda was a no-op.
  Replaced with Thread.Sleep() to actually block as intended.

BrokerRequestTests.cs:
  Bug: Two test methods called TaskThrowsAsync without await in sync
  test methods, so assertions never ran. Converted to async Task.

TokenCacheTests.cs:
  Bug: SaveTokenResponseAsync unawaited in two sync test methods,
  so token writes may not complete before assertions ran.
  Converted to async Task.

InteractiveRequestOrchestrationTests.cs:
  NSubstitute Received.InOrder() takes Action, so async method calls
  inside are intercepted, not executed. Discarded via _ = to make
  the intent explicit.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
@Robbie-Microsoft
Enforce code formatting in CI and document developer setup
38cb30e 
- build/template-prebuild-code-analysis.yaml: Add dotnet format
  --severity info --verify-no-changes to PreBuildCheck stage so PRs
  fail if formatting violations are introduced in the core library.

- .vscode/settings.json: New file — enables format-on-save and
  fix-all code actions for VS Code users automatically.

- CONTRIBUTING.md: Add Code Formatting section documenting how to
  run dotnet format locally, and how to configure VS 2022 Code
  Cleanup on Save for auto-fix behavior.

Note: suggestion-level rules are enforced via dotnet format in CI
rather than by bumping .editorconfig severities to :warning, since
the codebase has existing violations that will be cleaned up
separately.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
@Robbie-Microsoft
Apply dotnet format whitespace fixes across core library and unit tests
0262861 
Auto-fix trailing whitespace, indentation, and blank line violations
detected by dotnet format whitespace. Excludes vendored json/ folder.
Style and analyzer rules (IDE0008, IDE0090, etc.) require manual review
due to multi-target framework complexity.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
@Robbie-Microsoft
Fix CA1859: Use concrete types for improved performance
8bc4ae3 
Replace interface-typed fields, local variables, and return types
with their concrete implementations across 14 files:

- IEnumerable<IAccount> -> List<IAccount> (ClientApplicationBase)
- ISet<string> -> HashSet<string> (WwwAuthenticateParameters,
  AadAuthority, KnownMetadataProvider x2, MsalServiceExceptionFactory,
  UsernamePasswordRequest, UserFederatedIdentityCredentialRequest,
  TokenCache.ITokenCacheInternal x2)
- IDictionary<K,V> -> Dictionary<K,V> (UserMetadataProvider,
  KnownMetadataProvider, MsalAccessTokenCacheItem,
  DeviceAuthHelper, TokenCache.ITokenCacheInternal)
- IDictionary<string,JToken> -> Dictionary<string,JToken>
  (CacheSerializationContract)
- IRegionManager -> RegionManager (RegionAndMtlsDiscoveryProvider)
- RSA -> RSACng (InMemoryManagedIdentityKeyProvider)

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
@Robbie-Microsoft
Apply IDE0090/IDE0008/IDE0290 style fixes and suppress CA1866
f13b710 
- IDE0090: Use target-typed new() expressions (core library + unit tests)
- IDE0008: Use explicit types instead of var (core library + unit tests)
  - AbstractManagedIdentity.cs: pragma suppress for TFM-dependent JSON types
- IDE0290: Use primary constructor syntax where applicable (286 core + 210 test files)
- .editorconfig: Suppress CA1866 (char overloads require .NET 5+, not available
  in net462/netstandard2.0 targets; multi-target false positive)

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
@Robbie-Microsoft
Fix additional style/analyzer violations across core library and unit…
d3d1295 
… tests

Style rules applied (dotnet format style):
- IDE0044: Make field readonly
- IDE0063: Use simple using statement (pattern)
- IDE0049: Use language keywords (String->string, Int32->int, etc.)
- IDE0003: Remove 'this.' qualification
- IDE2000: Remove extra blank lines
- IDE0059: Remove unnecessary value assignments
- IDE0028/IDE0017: Use collection and object initializers
- IDE0300/IDE0301: Use collection expressions
- IDE0066: Use switch expressions
- IDE0074: Use compound assignments (x += y)
- IDE0071: Simplify string interpolation
- IDE0034: Simplify default expression
- IDE0031: Use null propagation
- IDE0270: Simplify null checks
- IDE0075: Simplify conditional expressions
- IDE0251/IDE0250: Make members/structs readonly
- IDE0016: Use throw expressions

Analyzer rules applied (dotnet format analyzers):
- CA1860: Avoid Enumerable.Any() extension method
- CA1861: Use static readonly fields over constant array arguments

.editorconfig suppressions added (multi-target false positives):
- CA1866: char overloads require .NET 5+ (not available in net462/netstandard2.0)
- CA1510: ThrowIfNull requires .NET 6+
- IDE0057: Range operator requires System.Index (.NET 5+)
- IDE0019: Pattern matching causes duplicate variable issues in #if blocks

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
@Robbie-Microsoft
Fix remaining violations and suppress multi-target false positives in…
72cad19 
… .editorconfig

Additional fixes applied:
- IDE0018: Inline variable declaration
- IDE0059: Remove unnecessary value assignments
- IDE0036: Order modifiers
- IDE1005: Use conditional delegate call
- IDE0305: Use collection expression (fluent)
- IDE0083: Use pattern matching 'is not null'
- IDE0300/IDE0301: Use collection expressions
- IDE0290: Additional primary constructor fixes
- CA1854: Prefer TryGetValue over ContainsKey
- CA1860/CA1861: Enumerable.Any, constant array fixes

.editorconfig: Suppress rules that are multi-target false positives:
- IDE0039: Lambda->local function breaks VSTHRD200 naming convention
- IDE0051/IDE0052: Removes members used in other TFMs via #if blocks
- IDE0056: Range/index operator requires .NET 5+
- CA1845/CA1846: Span-based overloads require .NET 5+
- CA1850: HashData requires .NET 5+
- CA2250/CA1512/CA1513: ThrowIfX methods require .NET 6+/8+

Remaining unfixable violations:
- IDE1006 (382): Naming - no Fix All support in dotnet format
- IDE0130 (359): Namespace != folder - crashes dotnet format
- IDE0090 (44): new() in preprocessor blocks
- CA1859 (20): No code fix available
- IDE0060 (16): Unused parameter - no code fix

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
@Robbie-Microsoft
Fix remaining violations: IDE1006/IDE0060/IDE0090/CA1859/IDE0130
163face 
- IDE1006 naming: renamed 89 private/internal static fields to s_ prefix
  and instance fields to _ prefix; suppressed public API constants that
  can't be renamed without breaking changes (iOSBroker*, Prompt.*, XmlNamespace.*)
- IDE1006: renamed private Base64* constants, IosBroker* internal members
- IDE0060: added #pragma suppress for 4 unused params reserved for future use
- IDE0090: fixed new() in 8 more files (HashSet, StringBuilder, Dictionary)
- CA1859: changed IDictionary/ISet/IRegionManager to concrete types in 5 files
- IDE0130: suppressed globally - intentional flat namespace Microsoft.Identity.Client
- editorconfig: scoped static_fields naming rule to private+internal (not public)
  to avoid false positives on public static fields

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
@Robbie-Microsoft
Fix import ordering in RequestBase.cs and add --exclude json to CI fo…
07c467b 
…rmat command

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
@Robbie-Microsoft
Fix formatting violations in new files from main refactor
63405fd 
- MacNativeMethods.cs: add pragma IDE0060 for P/Invoke params, convert
  UnmanagedCallConv new Type[]{} to collection expressions
- WindowsNativeDpiHelper.cs: same pragma + collection expression fixes
- WindowsNativeMethods.cs: add pragma IDE0060, fix collection expression
- WindowsNativeUtils.cs: add pragma IDE0060 for CoInitializeSecurity params
- MsalIdHelper.cs: fix IDE0008 var -> Regex explicit type
- .editorconfig: suppress SYSLIB1054 (LibraryImport requires .NET 7+)
- CI yaml: add --exclude json\ to dotnet format command

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Copilot AI review requested due to automatic review settings April 27, 2026 20:10
Copilot AI reviewed Apr 27, 2026
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Copilot wasn't able to review this pull request because it exceeds the maximum number of files (300). Try reducing the number of changed files and requesting a review from Copilot again.

@Robbie-Microsoft
fix: revert net7+-only P/Invoke changes, suppress SYSLIB1045/1054 in …
499af9b 
….editorconfig

dotnet format --severity info incorrectly applied SYSLIB1054 (DllImport -> LibraryImport)
and SYSLIB1045 (new Regex -> [GeneratedRegex]) to files that must compile on net462 and
netstandard2.0. LibraryImport, UnmanagedCallConv, and GeneratedRegex require .NET 7+.

Restore these 5 files to their main baseline (DllImport/extern) and apply only safe
whitespace/style fixes (IDE0008, IDE0090, IDE0250):
- MacNativeMethods.cs
- WindowsNativeMethods.cs
- WindowsNativeDpiHelper.cs
- WindowsNativeUtils.cs
- MsalIdHelper.cs

Also add SYSLIB1045.severity = none to .editorconfig alongside the existing SYSLIB1054
suppression so future dotnet format runs don't re-introduce these violations.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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