In this point release, we kept focussing on improving decompilation accuracy and performance (raw performance as well as memory usage) across the board. This is why again a lot of work went in the category Testing / Infrastructure.

One major performance win to point out is that we now ship ilspycmd with native AOT packages for linux-x64 and win-x64. Measured on win-x64 against the same 3 MB input (ICSharpCode.Decompiler.dll), medians of five runs:

For an agent loop that spawns ilspycmd per question that is a 4x to 7x reduction per call!

New Features

• PR [#4248]: Add a search box to the Options tab
• PR [#4241]: Add opt-in RID-specific and Native AOT packages for ilspycmd
• PR [#4197]: Add cross-platform PDB dumping to ilspycmd

Enhancements

• PR [#4268]: Native AOT fidelity follow-up: resolver lookup, culture independence, gate coverage
• PR [#4259]: Native AOT fidelity for the ICSharpCode.Decompiler package
• PR [#4256]: Make ilspycmd -il honor the --type and --member selection
• PR [#4247]: Report ilspycmd usage mistakes instead of crashing
• PR [#4236]: Transform value.<Clone>$() into value with {} even if there are no initializers
• PR [#4222]: Improved decompilation support for VB.NET closures
• PR [#4201]: Rewrite VB WithEvents WinForms initialization
• PR [#4160]: Decide extension method syntax in CallBuilder
• PR [#4188]: Detect generated closure cache types
• PR [#4185]: Handle required members on record copy constructors
• PR [#4179]: Include member context in decompilation error comments
• PR [#4171]: Recognize metadata property backing fields

Testing / Infrastructure

• PR [#4285]: Fix decompdiff platform reference staging
• PR [#4283]: Improve Debug Steps and decompdiff workflows
• PR [#4276]: nugetfuzz: add parallelization + report caught exceptions
• PR [#4274]: Migrate ILSpy.sln to the SLNX solution format
• PR [#4269]: Cut the ILSpy.Tests wall clock: cheap fixtures, dead waits, duplicate tests, and process sharding
• PR [#4261]: Keep tests off the network unless a toolset download is actually needed
• PR [#4255]: Add top 500 NuGet package list
• PR [#4254]: Reenable LiftedOperators tests
• PR [#4230]: Add allocation trace viewer
• PR [#4240]: Use local .NET Framework assemblies in nugetfuzz
• PR [#4235]: Fallback from unsupported netcoreapp assets in nugetfuzz
• PR [#4205]: Clean up package restore (Diasymreader)
• PR [#4187]: Let decompdiff reports use full width
• PR [#4184]: Separate obfuscated names in nugetfuzz
• PR [#4183]: Stream nugetfuzz HTML report generation
• PR [#4177]: Index NuGet assemblies by contained name in decompdiff

Contributions

• PR [#4253]: Fix [#3702]: Don't rewrite GetValueOrDefault() to == true in ?. chains — @dualfroz, thank you!
• PR [#4251]: Fix [#4017]: Look through LdObjIfRef on the operand of await — @dualfroz, thank you!
• PR [#4231]: Fix [#4135]: Keep bool-to-int conditional in its local — @dualfroz, thank you!
• PR [#4216]: Add option to highlight usages of the symbol at the caret — @pieroviano, thank you!
• PR [#4228]: Fix [#4153]: keep foreach when a named argument inlines the loop variable — @LiquidSnake0, thank you!
• PR [#4232]: Fix [#4137]: Keep nint in conditionals with mixed native int branches — @dualfroz, thank you!

Performance

• PR [#4266]: Start the startup warm-ups before Avalonia's setup
• PR [#3963]: Substring optimizations: eliminate hot-path allocations (audit top 8)
• PR [#4229]: Avoid cloning settings for every method
• PR [#4164]: Coalesce the global command re-query
• PR [#4157]: Coalesce the assembly tree's selection and removal fan-out

Bug Fixes

• PR [#4286]: Apply type transformations to fake member signatures
• PR [#4288]: Fix exceptions on obfuscated code
• PR [#4250]: Fix [#4245]: Ignore find-panel clicks when resolving reference clicks
• PR [#4249]: Fix [#4246]: Scope prefixes no longer leak into search keywords
• PR [#4225]: Fix [#2829]: Emit continue for leave through try-finally
• PR [#4223]: Fix ResXResourceWriter empty output and type names
• PR [#4220]: Fix [#3180]: avoid invalid null-conditional extension calls
• PR [#4206]: Fix startup binding errors and background load sweep failure
• PR [#4204]: Keep package entry selections decompilable
• PR [#4202]: Fix mixed array initializers
• PR [#4200]: Reserve captured local names in declaring scope
• PR [#4194]: Fix UTF-8 literal span initializers
• PR [#4181]: Ignore missing runtime files in XML doc ref-pack lookup
• PR [#4163]: Ignore detached tree rows when showing selection
• PR [#4178]: Handle expression-tree null conversions
• PR [#4182]: Fix [#4180]: Parenthesize negated negative constants
• PR [#4165]: Do not apply cancelled decompilation output

For a full list of changes click here.

This release is based on .NET 10.0. Please make sure that you have it installed on your machine beforehand.

Note for Mac users: see https://github.com/icsharpcode/ILSpy/wiki/Build-Artifacts#running-the-macos-artifact because the ILSpy.app is neither signed nor notarized.

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