GitHub Release: icsharpcode/ILSpy v11.2 (27.10.2026)

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!

• 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

• 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

• 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

• 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!

• 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

• 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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