ILSpy

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1. v11.2 Oct 27, 2026 · issue 122

   ILSpy v11.2 ships native AOT ilspycmd packages for linux-x64/win-x64, cross-platform PDBPDBA debug symbol file format used by Microsoft's toolchain that maps compiled binaries back to source code, function names, and variable types, letting cyber tools resolve symbols during reverse engineering or memory analysis. dumping, and a new Options search box.⁠︀︄︇︀︅︉︀︅︀︀︃︀︀︅︅︀︅︊︀︄︆︀︃︄⁠

   └──▷ GET THIS VERSION

   copy

   $ git clone --branch v11.2 https://github.com/icsharpcode/ILSpy.git
   # already have the repo? check out this version:
   $ git checkout v11.2

   └──▷ TRY IT
   Disassemble IL for a specific type using the AOT ilspycmd package on Linux to get fast, sub-100 ms output in an automated analysis loop.
   copy

   $ ilspycmd -il --type MyNamespace.MyClass MyAssembly.dll

   • Adds --type and --member selection support to ilspycmd -il (IL disassembly now respects the same filtering flags as decompilation).⁠︀︄︇︀︅︉︀︅︀︀︃︀︀︅︅︀︅︊︀︄︆︀︃︄⁠
   • Adds cross-platform PDB dumping to ilspycmd.
   • Adds opt-in native AOT packages for ilspycmd targeting linux-x64 and win-x64, reducing per-call startup from ~1.8 s to ~315 ms (4–7× faster) for use cases like agent loops that spawn ilspycmd per query.
   • Adds a search box to the Options tab in the ILSpy GUIGUIA graphical user interface, controls such as windows, buttons and menus. It lets people use software visually rather than entering commands..
   • Adds an option to highlight all usages of the symbol at the caret in the editor.
   • Adds --type and --member selection support to ilspycmd -il (IL disassembly now respects the same filtering flags as decompilation).⁠︀︄︇︀︅︉︀︅︀︀︃︀︀︅︅︀︅︊︀︄︆︀︃︄⁠
   • Adds cross-platform PDB dumping to ilspycmd.
   • Adds opt-in native AOT packages for ilspycmd targeting linux-x64 and win-x64, reducing per-call startup from ~1.8 s to ~315 ms (4–7× faster) for use cases like agent loops that spawn ilspycmd per query.
   • Adds an option to highlight all usages of the symbol at the caret in the editor.

   1 more in Everything

2. v11.1 Sep 23, 2026 · issue 083

   ILSpy v11.1 adds C# 14 decompilation, mass-testing tools, and ilspycmd bundle support⁠︀︄︇︀︅︉︀︅︀︀︃︀︀︅︅︀︅︊︀︄︆︀︃︄⁠

   └──▷ GET THIS VERSION

   copy

   $ git clone --branch v11.1 https://github.com/icsharpcode/ILSpy.git
   # already have the repo? check out this version:
   $ git checkout v11.1

   └──▷ TRY IT
   Navigate directly to a member by ID without needing to supply a full signature — useful when you only have a partial ID from a crash report or reference.
   copy

   $ ilspycmd MyAssembly.dll --navigateto 'M:MyNamespace.MyClass.MyMethod'

   • Adds nugetfuzz test tool that downloads NuGetNuGetMicrosoft's package manager for .NET, hosting a public registry of reusable libraries so tools can pull in dependencies without bundling or manually maintaining third-party code. packages and runs them through a debug build of ilspycmd, recording crashes, assertion failures, decompiler warnings, and leaked compiler-generated identifiers in C# output.⁠︀︄︇︀︅︉︀︅︀︀︃︀︀︅︅︀︅︊︀︄︆︀︃︄⁠
   • Adds decompdiff test tool that runs an assembly through two different versions of the decompiler via ilspycmd and produces a diff of the generated source code; supports --no-build and can run against git refs.
   • Accepts single-file bundles as ilspycmd input (previously unsupported).
   • Accepts member IDs without a signature in --navigateto in ilspycmd.
   • Decompiles C# 14 implicit span conversions (first-class span types).

   +7 more show less

   • Decompiles C# 14 semi-auto properties with the field keyword.
   • Emits C# 7.1 default literals where the context supplies the type.
   • Keeps the UI responsive while searching and drawing reference nodes, enabling search inside packages without stalling and navigation to results.
   • Detects local functions renamed by obfuscators.
   • Invents a decompiler syntax for the ldtoken IL instruction.
   • Expands nested conditional operators back into if-else in decompiled output.
   • Extends UseLambdaSyntax to emit statement lambdas.
   • Adds nugetfuzz test tool that downloads NuGetNuGetMicrosoft's package manager for .NET, hosting a public registry of reusable libraries so tools can pull in dependencies without bundling or manually maintaining third-party code. packages and runs them through a debug build of ilspycmd, recording crashes, assertion failures, decompiler warnings, and leaked compiler-generated identifiers in C# output.⁠︀︄︇︀︅︉︀︅︀︀︃︀︀︅︅︀︅︊︀︄︆︀︃︄⁠
   • Adds decompdiff test tool that runs an assembly through two different versions of the decompiler via ilspycmd and produces a diff of the generated source code; supports --no-build and can run against git refs.
   • Accepts single-file bundles as ilspycmd input (previously unsupported).
   • Decompiles C# 14 implicit span conversions (first-class span types).
   • Decompiles C# 14 semi-auto properties with the field keyword.

   +3 more show less

   • Emits C# 7.1 default literals where the context supplies the type.
   • Detects local functions renamed by obfuscators.
   • Invents a decompiler syntax for the ldtoken IL instruction.

   4 more in Everything

3. v11.0 Aug 12, 2026 · issue 043

   ILSpy v11.0 ports to Avalonia for Linux/Mac support and adds ilspycmd flags for agentic decompilation workflows.

   └──▷ GET THIS VERSION

   copy

   $ git clone --branch v11.0 https://github.com/icsharpcode/ILSpy.git
   # already have the repo? check out this version:
   $ git checkout v11.0

   └──▷ TRY IT
   Decompile a single method from an assembly to minimize output and reduce token usage when calling from an AI agent.
   copy

   $ ilspycmd MyAssembly.dll --member MyNamespace.MyClass.MyMethod

   Dump a specific metadata table from an assembly for low-level inspection without full decompilation.
   copy

   $ ilspycmd MyAssembly.dll --dump-table

   • Adds --member flag to ilspycmd for single-member decompilation, reducing token spend in agentic/LLMLLMA large language model, a neural network trained on large amounts of text to recognize patterns and generate language. Applications use it for tasks such as answering, summarizing and writing code. workflows.
   • Adds --dump-table metadata dump mode to ilspycmd.
   • Adds fuzzy matching for -t type name resolution in ilspycmd.
   • Ports ILSpy from WPF to Avalonia, enabling native GUIGUIA graphical user interface, controls such as windows, buttons and menus. It lets people use software visually rather than entering commands. support on Linux and macOS in addition to Windows.
   • Adds File / Open from NuGet feed to load assemblies directly from a NuGetNuGetMicrosoft's package manager for .NET, hosting a public registry of reusable libraries so tools can pull in dependencies without bundling or manually maintaining third-party code. feed.

   +3 more show less

   • Adds File / Open from running process on all platforms (Windows, Linux, macOS).
   • Adds Window / Bookmarks — a full-featured bookmarks implementation for the decompiled C# view.
   • Adds View / Options / Display / Show Omnibar — a breadcrumb/search bar at the top of decompiled code.

   8 details in Everything

   └──▷ BREAKING ON UPGRADE

   • !The WPF frontend has been entirely removed; ILSpy now uses the Avalonia frontend exclusively.
   • !The VS2017/2019 add-in has been removed; only VS2022–2026 add-ins are supported going forward.
4. v11.0-rc Prerelease Aug 4, 2026 · issue 035

   ILSpy v11.0-rc adds Open from running process, two new ilspycmd modes, hover tooltips, and metadata layout improvements.

   └──▷ GET THIS VERSION

   copy

   $ git clone --branch v11.0-rc https://github.com/icsharpcode/ILSpy.git
   # already have the repo? check out this version:
   $ git checkout v11.0-rc

   └──▷ TRY IT
   Dump a raw metadata table from an assembly for inspection without launching the GUIGUIA graphical user interface, controls such as windows, buttons and menus. It lets people use software visually rather than entering commands..
   copy

   $ ilspycmd --dump-table MyAssembly.dll

   Decompile a single method or type member to stdout — useful for quick diffs in CI.
   copy

   $ ilspycmd --member "MyNamespace.MyClass.MyMethod" MyAssembly.dll

   • Adds --dump-table metadata dump mode to ilspycmd for inspecting raw metadata tables.
   • Adds --member flag to ilspycmd for single-member decompilation.
   • New Open from running process dialog lets you attach ILSpy directly to a live process.
   • Publicizes IProjectFileWriter implementations for programmatic project-file writing.
   • Adds a WholeProjectDecompiler constructor with no default parameter values for explicit API use.

   +5 more show less

   • Shows hover tooltips for dynamic member accesses in the decompiler view.
   • Metadata row details panel now uses a full-width layout with a decompiler-styled editor for text blobs.
   • Ctrl+Click navigates member references while a plain click highlights them in the editor.
   • Show stored FieldList/MethodList values for memberless types in the metadata view.
   • Adds overrides analysis and this/base keyword navigation.

   10 details in Everything

5. v10.1 May 25, 2026 · release notes

   ILSpy v10.1 adds .NET 11 runtime-async decompilation support and BAML-to-XAML extraction in ilspycmd.

   └──▷ GET THIS VERSION

   copy

   $ git clone --branch v10.1 https://github.com/icsharpcode/ILSpy.git
   # already have the repo? check out this version:
   $ git checkout v10.1

   • Supports decompilation of .NET 11 runtime-async methods, enabling analysis of assemblies compiled with the new runtime-async feature.
   • Adds listing, extracting embedded resources, and decompiling BAML to XAML via ilspycmd.

   2 details in Everything

6. v10.0 Apr 6, 2026 · release notes

   ILSpy v10.0 adds C# 14 extension members, API diff, batch PDBPDBA debug symbol file format used by Microsoft's toolchain that maps compiled binaries back to source code, function names, and variable types, letting cyber tools resolve symbols during reverse engineering or memory analysis. generation, and .NET 10 support.

   └──▷ GET THIS VERSION

   copy

   $ git clone --branch v10.0 https://github.com/icsharpcode/ILSpy.git
   # already have the repo? check out this version:
   $ git checkout v10.0

   • Supports C# 14 extension members decompilation with dedicated UI and Decompiler APIs.
   • Supports C# 13 allows ref struct generic constraint decompilation.
   • Supports C# 12 InlineArray decompilation.
   • New API diff feature for comparing assembly APIs.
   • Supports batch PDB generation via GeneratePdbForAssemblies.

   +16 more show less

   • Supports disassembling single-file bundles in the GUIGUIA graphical user interface, controls such as windows, buttons and menus. It lets people use software visually rather than entering commands..
   • Adds disassembler support for ildasm /caverbal format.
   • Adds support for the ckfinite IL opcode in the decompiler.
   • Enables navigating visible decompiler history in the UI.
   • Adds dynamic ILSpy settings options to ILSpyCmd.
   • Allows extracting multiple package entries at once.
   • Adds DecompilerSettings.ExpandParamsArguments configuration option.
   • Adds DecompilerSettings.AlwaysMoveInitializer option to always move initializers from static constructors to field initializers.
   • Adds configuration option to check for overflow and underflow.
   • Adds option to suppress transformation of Activator.CreateInstance<T>() to new T().
   • Makes WholeProjectDecompiler.CreateDecompiler protected virtual, enabling extensible decompilation pipelines.
   • Makes TargetFramework and TargetServices APIs public.
   • Enables detection of .NET version without TargetFrameworkAttribute.
   • Adds API to set an initially highlighted entity after navigation.
   • Allows creating a MetadataFile with a MetadataReader / MetadataStringDecoder.
   • Allows passing an IDecompilerTypeSystem rather than a DecompilerTypeSystem to CSharpDecompiler.

   21 details in Everything

   └──▷ BREAKING ON UPGRADE

   • !Removed legacy UnresolvedUsingScope.
   • !Renamed ResolvedUsingScope to UsingScope.
   • !Removed legacy ToTypeReference.
   • !Removed ITypeReference and its implementations.
   • !Translations have been removed from the UI.
   • !GeneratePdbForAssembly is replaced by GeneratePdbForAssemblies; callers must update to the new method.
   • !Requires .NET 10.0 runtime — must be installed before upgrading.
7. v10.0-preview3 Prerelease Mar 25, 2026 · release notes

   ILSpy v10.0-preview3 adds dedicated UI and decompiler APIs for C# 14 extension members.

   └──▷ GET THIS VERSION

   copy

   $ git clone --branch v10.0-preview3 https://github.com/icsharpcode/ILSpy.git
   # already have the repo? check out this version:
   $ git checkout v10.0-preview3

8. v10.0-preview2 Prerelease Dec 30, 2025 · release notes

   ILSpy v10.0-preview2 adds C# 14 extension members, batch PDBPDBA debug symbol file format used by Microsoft's toolchain that maps compiled binaries back to source code, function names, and variable types, letting cyber tools resolve symbols during reverse engineering or memory analysis. generation, and navigate-visible-history UI.

   └──▷ GET THIS VERSION

   copy

   $ git clone --branch v10.0-preview2 https://github.com/icsharpcode/ILSpy.git
   # already have the repo? check out this version:
   $ git checkout v10.0-preview2

   • Adds C# 14 extension members decompilation support.
   • Adds C# 13 allows ref struct constraint decompilation support.
   • Updates pattern detection to Roslyn 5.0 RTM.
   • Supports ckfinite IL opcode in the decompiler.
   • Adds ildasm /caverbal format support in the Disassembler.

   +9 more show less

   • Adds batch PDB generation via GeneratePdbForAssemblies.
   • New UI: navigate visible history for forward/back navigation.
   • New API to set an initially highlighted entity after navigation.
   • Allows extracting multiple package entries at once.
   • Adds DecompilerSettings.ExpandParamsArguments setting.
   • Adds DecompilerSettings.AlwaysMoveInitializer to always move initializers from static constructors to field initializers.
   • Allows passing an IDecompilerTypeSystem (instead of concrete DecompilerTypeSystem) to CSharpDecompiler.
   • Enables detection of .NET version without TargetFrameworkAttribute.
   • Lists assembly name first in ILSpy title bar when multiple instances are open.

   14 details in Everything

   └──▷ BREAKING ON UPGRADE

   • !Removed legacy UnresolvedUsingScope API.
   • !ResolvedUsingScope is renamed to UsingScope.
   • !Removed legacy ToTypeReference API.
   • !Removed ITypeReference and its implementations.
   • !GeneratePdbForAssembly is replaced by GeneratePdbForAssemblies.
9. v9.1 Apr 22, 2025 · release notes

   ILSpy 9.1 adds Roslyn 4.13 pattern detection, custom attribute sorting, variable scope improvements, and smooth-scroll toggle.

   └──▷ GET THIS VERSION

   copy

   $ git clone --branch v9.1 https://github.com/icsharpcode/ILSpy.git
   # already have the repo? check out this version:
   $ git checkout v9.1

   • Updates pattern-detection to Roslyn 4.13 for improved C# language feature decompilation.
   • Adds an option to sort custom attributes in the decompiled output.
   • Adds variable scopes to improve naming of local variables and anonymous method parameters.
   • Adds an option to turn off smooth scrolling in the UI.
   • Supports array initialization based on RuntimeHelpers.CreateSpan<T>.

   +6 more show less

   • Adds module filename as a ToolTip on AnalyzerEntityTreeNode.
   • Extends error information when multiple assemblies with the same short name are selected during solution file creation.
   • Allows ILSpy to launch when .NET 8.0 is not installed but a later runtime version is present.
   • Adds support for evaluation-order-preserving reference type checks.
   • Improves UI rendering of primary constructors on non-record types.
   • Uses type hints in pointer arithmetic for more accurate decompilation.

   11 details in Everything

10. v9.0 Jan 19, 2025 · release notes

    ILSpy 9.0 adds WebCIL/WASMWASMA binary instruction format for a stack-based virtual machine, maintained by the W3C, that lets code compiled from any language run at near-native speed inside a sandboxed environment across browsers and servers. support, assembly diagramming, standalone ECMA-335 metadata reading, and C# 12 decompilation.

    └──▷ GET THIS VERSION

    copy

    $ git clone --branch v9.0 https://github.com/icsharpcode/ILSpy.git
    # already have the repo? check out this version:
    $ git checkout v9.0

    • Supports reading WebCIL assemblies (IL embedded in WASM) for decompiling Blazor/WebAssemblyWebAssemblyA binary instruction format that runs in browsers and server runtimes at near-native speed, letting developers compile C, Rust, or other languages into a portable, sandboxed module any compliant host can execute. binaries.
    • Supports reading standalone ECMA-335 metadata blobs, including portable PDBs.
    • New Diagramming feature lets you visualize assembly relationships via the context menu or ilspycmd.
    • Adds Clear assembly list menu item for quick workspace cleanup.
    • Adds option to disable automatic assembly loading to give users explicit control over what gets resolved.

    +13 more show less

    • Decompiles C# 12 primary constructors.
    • Decompiles C# 12 ref readonly parameters.
    • Decompiles switch statements on (ReadOnly)Span<char> using compiler-generated hash functions.
    • Decompiles types that provide DisposeAsync without implementing IAsyncDisposable.
    • Updated pattern detection to Roslyn 4.12 for improved C# output accuracy.
    • IL output now shows indentation level for custom attributes on interface implementations and prints metadata tokens for custom attributes.
    • TreeView now surfaces referenced types, members, and exported types under the References node.
    • Reads and uses tuple element names and dynamic type information from PDBs.
    • Activates Dynamic Adaptation To Application Sizes (DATAS) and RDPRDPA Microsoft protocol that lets a user view and control a remote Windows desktop over a network, giving cyber tools a standard channel to audit, attack-simulate, or monitor Windows systems remotely. hardware acceleration for improved performance.
    • Allows collecting analyzers annotated with ExportAnalyzerAttribute.
    • New IFileLoader API enables easier extensibility of supported file formats.
    • Exposes IProjectFileWriter and IProjectInfoProvider APIs as public for plugin authors.
    • Moves non-UI analyzer API to the ILSpyX package for cross-platform reuse.

    18 details in Everything

    └──▷ BREAKING ON UPGRADE

    • !The PEFile class now has a MetadataFile base class in ICSharpCode.Decompiler; code referencing PEFile directly may need updates.
    • !IModule.PEFile is renamed to IModule.MetadataFile in ICSharpCode.Decompiler.
    • !The BAML decompiler is split into a library and an add-in; integrations depending on the original structure will break.
    • !Non-UI analyzer API is moved from ILSpy to ILSpyX; references to the old namespace/assembly will break.
    • !@file command-line support introduces breaking changes to existing command-line options.
    • !New single-instance handling changes behavior for existing single-instance integrations.
    • !IsRef, IsOut, and IsIn flags are removed from IParameter; code checking those flags will break.
    • !ParameterModifiers is replaced with ReferenceKind; all uses of ParameterModifiers will break.
11. v9.0-rc Prerelease Jan 6, 2025 · release notes

    ILSpy 9.0 RC adds visual diagramming, updated Roslyn 4.12 pattern detection, and improved switch decompilation.

    └──▷ GET THIS VERSION

    copy

    $ git clone --branch v9.0-rc https://github.com/icsharpcode/ILSpy.git
    # already have the repo? check out this version:
    $ git checkout v9.0-rc

    • New Diagramming feature enables visual graph-based exploration of type and assembly relationships.
    • Updates pattern detection to Roslyn 4.12, improving decompilation accuracy for modern C# constructs.
    • Supports implicit conversions in switch expressions during decompilation.

    3 details in Everything

    └──▷ BREAKING ON UPGRADE

    • !ILSpy 9.x is built framework-dependent (except the self-contained distribution), requiring .NET 8.0 or later to be installed before launching.
12. v9.0-preview3 Prerelease Nov 10, 2024 · release notes

    ILSpy 9.0-preview3 adds C# 12 primary constructors, ref readonly parameters, and DisposeAsync decompilation support.

    └──▷ GET THIS VERSION

    copy

    $ git clone --branch v9.0-preview3 https://github.com/icsharpcode/ILSpy.git
    # already have the repo? check out this version:
    $ git checkout v9.0-preview3

    • Supports decompilation of C# 12 primary constructors.
    • Supports decompilation of C# 12 ref readonly parameters.
    • Supports types that provide DisposeAsync without implementing IAsyncDisposable.
    • Updates pattern detection to match Roslyn 4.11.0 language features.
    • Adds smooth scrolling to settings panels and DecompilerTextView.

    +1 more show less

    • Enables collecting analyzers annotated with ExportAnalyzerAttribute.

    6 details in Everything

    └──▷ BREAKING ON UPGRADE

    • !The IsRef, IsOut, and IsIn flags are removed from IParameter in ICSharpCode.Decompiler.
    • !ParameterModifiers is replaced with ReferenceKind in ICSharpCode.Decompiler.
13. v9.0-preview2 Prerelease Jun 9, 2024 · release notes

    ILSpy v9.0-preview2 adds .NET 8 foundation and new @file argument support for batch loading.

    └──▷ GET THIS VERSION

    copy

    $ git clone --branch v9.0-preview2 https://github.com/icsharpcode/ILSpy.git
    # already have the repo? check out this version:
    $ git checkout v9.0-preview2

    • @file support with breaking changes to command line options
    • New single instance handling

    2 details in Everything

    └──▷ BREAKING ON UPGRADE

    • !@file support introduces breaking changes to command line options (#3205)
14. v9.0-preview1 Prerelease Apr 1, 2024 · release notes

    ILSpy v9 adds WebCIL/WASMWASMA binary instruction format for a stack-based virtual machine, maintained by the W3C, that lets code compiled from any language run at near-native speed inside a sandboxed environment across browsers and servers. reading, standalone ECMA metadata support, DATAS/RDPRDPA Microsoft protocol that lets a user view and control a remote Windows desktop over a network, giving cyber tools a standard channel to audit, attack-simulate, or monitor Windows systems remotely. perf, and a disable-auto-load config option.

    └──▷ GET THIS VERSION

    copy

    $ git clone --branch v9.0-preview1 https://github.com/icsharpcode/ILSpy.git
    # already have the repo? check out this version:
    $ git checkout v9.0-preview1

    • Disable automatic assembly loading UI option
    • Add Clear assembly list menu item to the Assembly List panel
    • Added support for reading WebCIL assemblies (IL embedded in WASM)
    • Activated Dynamic Adaptation To Application Sizes (DATAS)
    • RDP hardware acceleration for remote sessions

    5 details in Everything

    └──▷ BREAKING ON UPGRADE

    • !ILSpy now requires .NET 8.0 or later to run (artifacts are framework-dependent).
    • !IModule.PEFile is renamed to IModule.MetadataFile in the decompiler API.
    • !The BAML decompiler is split into a library and an add-in.
    • !Non-UI analyzer API is moved to ILSpyX.
15. v8.2 Nov 6, 2023 · release notes

    ILSpy 8.2 adds support for C# 7.1-11 language features and the NUGET_PACKAGES environment variable

    └──▷ GET THIS VERSION

    copy

    $ git clone --branch v8.2 https://github.com/icsharpcode/ILSpy.git
    # already have the repo? check out this version:
    $ git checkout v8.2

    • Adds NUGET_PACKAGES environment variable support to control NuGetNuGetMicrosoft's package manager for .NET, hosting a public registry of reusable libraries so tools can pull in dependencies without bundling or manually maintaining third-party code. package resolution paths
    • Supports C# 7.1 pattern matching with generics in decompiled output
    • Supports C# 8.0 recursive patterns in decompiled output
    • Supports C# 9.0 relational patterns in decompiled output
    • Supports C# 9.0 not patterns in decompiled output

    +4 more show less

    • Supports C# 10.0 static abstract members in interfaces in decompiled output
    • Supports C# 11.0 switch on (ReadOnly)Span<char> in decompiled output
    • Adds entry size info to R2R (ReadyToRun) metadata viewing
    • Includes GC info in R2R (ReadyToRun) output display

    9 details in Everything

16. v8.1 Aug 3, 2023 · release notes

    ILSpy v8.1 adds C# 11 language support, ARM64ARM64The 64-bit instruction set architecture from ARM Holdings, used in modern mobile chips, Apple Silicon, and cloud server CPUs; tools target it to run natively on those platforms without emulation overhead. binaries, and --disable-updatecheck for ilspycmd

    └──▷ GET THIS VERSION

    copy

    $ git clone --branch v8.1 https://github.com/icsharpcode/ILSpy.git
    # already have the repo? check out this version:
    $ git checkout v8.1

    └──▷ USE IT
    Run ilspycmd in CI or automation without triggering update prompts.
    shell copy

    dotnet tool run ilspycmd --disable-updatecheck MyAssembly.dll

    • Adds --disable-updatecheck flag to ilspycmd dotnet tool to control update behavior in automation.
    • Adds ARM64 binaries and ARM64 installer downloads for the VS 2022 extension and standalone distribution.
    • Adds support for C# 11 features including checked operators, unsigned right shift operator, UTF8 string literals, numeric IntPtr, and ref fields/scoped.

    3 details in Everything

    └──▷ BREAKING ON UPGRADE

    • !ILSpy now requires [.NET 6.0.2](https://dotnet.microsoft.com/en-us/download/dotnet/6.0) installed to run; artifacts are built framework-dependent.
17. v8.0 May 21, 2023 · release notes

    ILSpy v8 introduces .NET 6 base, new decompiler support for C# 10/11 and VB features, and ilspycmd project/solution export options.

    └──▷ GET THIS VERSION

    copy

    $ git clone --branch v8.0 https://github.com/icsharpcode/ILSpy.git
    # already have the repo? check out this version:
    $ git checkout v8.0

    • ilspycmd now supports the --nested-directories option when exporting projects.
    • Users can provide an ID when generating a PDBPDBA debug symbol file format used by Microsoft's toolchain that maps compiled binaries back to source code, function names, and variable types, letting cyber tools resolve symbols during reverse engineering or memory analysis. via a new ilspycmd option.
    • Adds an option to always fully qualify type names with global:: in the disassembler output.

    3 details in Everything

    └──▷ BREAKING ON UPGRADE

    • !ILSpy v8 requires .NET 6.0.2+ runtime for non-self-contained distributions; .NET Framework 4.7.2 is no longer supported.
18. v8.0-rc1 Prerelease May 14, 2023 · release notes

    ILSpy v8.0-rc1 adds dark title bar support and a PowerShell manifest for installation.

    └──▷ GET THIS VERSION

    copy

    $ git clone --branch v8.0-rc1 https://github.com/icsharpcode/ILSpy.git
    # already have the repo? check out this version:
    $ git checkout v8.0-rc1

    • Shows a dark title bar when a dark theme is selected in ILSpy

    1 detail in Everything

    └──▷ BREAKING ON UPGRADE

    • !ILSpy v8.0-rc1 no longer runs on .NET Framework; users must install [.NET 6.0.2](https://dotnet.microsoft.com/en-us/download/dotnet/6.0) or later
19. v8.0-preview4 Prerelease Apr 3, 2023 · release notes

    v8.0-preview4 adds R#/VS Code themes and decompresses Record structs in C# output

    └──▷ GET THIS VERSION

    copy

    $ git clone --branch v8.0-preview4 https://github.com/icsharpcode/ILSpy.git
    # already have the repo? check out this version:
    $ git checkout v8.0-preview4

    • Adds new UI themes (R# and VS Code) alongside existing Light/Dark options for the main window
    • Enables decompilation of record struct types in CSharpAmbience, emitting correct C# syntax
    • Adds support for Visual Basic Yield Return state machine decompilation
    • Supports disassembling ReadyToRun binaries compiled using composite mode

    4 details in Everything

    └──▷ BREAKING ON UPGRADE

    • !Non-self-contained builds now require .NET 6.0.2 installed on the host; .NET Framework 4.7.2 is no longer supported for these artifacts.
20. v8.0-preview3 Prerelease Dec 4, 2022 · release notes

    ILSpy v8.0-preview3 adds C# 11 required members, global:: qualification option, and resource size display

    └──▷ GET THIS VERSION

    copy

    $ git clone --branch v8.0-preview3 https://github.com/icsharpcode/ILSpy.git
    # already have the repo? check out this version:
    $ git checkout v8.0-preview3

    • Adds support for decompiling C# 11 required members.
    • Adds an option to always fully qualify type names with global::.
    • Updates pattern detection for Roslyn 4.4.0.

    3 details in Everything

21. v7.2 Feb 28, 2022 · release notes

    v7.2 adds inassembly: and innamespace: search predicates to ILSpyCmd, an MSI installer, and async DecompilerTypeSystem.CreateAsync API.

    └──▷ GET THIS VERSION

    copy

    $ git clone --branch v7.2 https://github.com/icsharpcode/ILSpy.git
    # already have the repo? check out this version:
    $ git checkout v7.2

    • Introduced MSI-based installer for the GUIGUIA graphical user interface, controls such as windows, buttons and menus. It lets people use software visually rather than entering commands. application
    • Added DecompilerTypeSystem.CreateAsync for asynchronous initialization of the decompiler type system

    2 details in Everything

    └──▷ BREAKING ON UPGRADE

    • !ilspycmd removed .NET Core 2.1 TFM support and now targets .NET 6.0 TFM
22. v7.1 May 30, 2021 · release notes

    Supports .NET 6 single-file bundles in ILSpy decompilation output.

    └──▷ GET THIS VERSION

    copy

    $ git clone --branch v7.1 https://github.com/icsharpcode/ILSpy.git
    # already have the repo? check out this version:
    $ git checkout v7.1

    • --singlefile (implied by support): Allows decompiling assemblies embedded in .NET 6 single-file bundles.

    1 detail in Everything

23. v7.0 Apr 28, 2021 · release notes

    ILSpy v7.0 adds C# 9 record classes, with expressions, dark mode, async assembly resolver API, and server-mode GC

    └──▷ GET THIS VERSION

    copy

    $ git clone --branch v7.0 https://github.com/icsharpcode/ILSpy.git
    # already have the repo? check out this version:
    $ git checkout v7.0

    └──▷ HOW TO FIND IT
    Switch to dark mode via the UI settings menu for better visibility during long reverse-engineering sessions.
    📍Settings › Appearance › Dark mode
    • Add Dark mode to the UI for high-contrast or low-light analysis workflows.
    • Enable async usage on the assembly resolver API to prevent UI thread blocking during large scans.
    • Enable server-mode GC in ILSpy to reduce memory pressure during deep decompilation of complex binaries.
    • Add C# 9 record classes, with expressions, and primary constructors support for accurate structural analysis of modern .NET code.

    4 details in Everything

    └──▷ BREAKING ON UPGRADE

    • !Removed the dependency on Humanizer
    • !Align dependencies with Roslyn 3.8.0
24. v7.0-rc1 Prerelease Apr 8, 2021 · release notes

    ILSpy v7.0-rc1 adds dark mode and new metadata tree nodes for custom debug info.

    └──▷ GET THIS VERSION

    copy

    $ git clone --branch v7.0-rc1 https://github.com/icsharpcode/ILSpy.git
    # already have the repo? check out this version:
    $ git checkout v7.0-rc1

    • Adds Dark mode UI theme
    • Adds inline display of CustomDebugInformation table entries in metadata
    • Adds metadata tree nodes for blob, guid, string and user string heap

    3 details in Everything

25. v7.0-preview3 Prerelease Feb 28, 2021 · release notes

    v7.0-preview3 adds NuGetNuGetMicrosoft's package manager for .NET, hosting a public registry of reusable libraries so tools can pull in dependencies without bundling or manually maintaining third-party code. package search, C# deterministic switch detection, async assembly resolver API, and themed message boxes.

    └──▷ GET THIS VERSION

    copy

    $ git clone --branch v7.0-preview3 https://github.com/icsharpcode/ILSpy.git
    # already have the repo? check out this version:
    $ git checkout v7.0-preview3

    • Enable theming for message boxes
    • Search enabled in NuGet packages
    • Detect use of csc /deterministic switch
    • Update Ready2Run support
    • Enable server-mode GC in ILSpy

    +1 more show less

    • Improve assembly resolver API to allow async usage

    6 details in Everything

26. v7.0-preview2 Prerelease Jan 11, 2021 · release notes

    Adds support for C# 9.0 record classes, with expressions, and primary constructors

    └──▷ GET THIS VERSION

    copy

    $ git clone --branch v7.0-preview2 https://github.com/icsharpcode/ILSpy.git
    # already have the repo? check out this version:
    $ git checkout v7.0-preview2

    └──▷ HOW TO FIND IT
    Enable the new line highlighting feature to better track code during inspection.
    📍Open Settings, search for 'highlight the current line in the code view', and enable it.
    • Added highlight the current line in the code view setting to improve readability of active source lines.
    • Added support for decompiling C# 9.0 record classes.
    • Added support for decompiling C# 9.0 with expressions.
    • Added support for decompiling C# 9.0 primary constructors.

    4 details in Everything

27. v6.2 Sep 24, 2020 · release notes

    ILSpy v6.2 adds decompilation support for C# 9 features and new UI options for expression inlining and member qualification.

    └──▷ GET THIS VERSION

    copy

    $ git clone --branch v6.2 https://github.com/icsharpcode/ILSpy.git
    # already have the repo? check out this version:
    $ git checkout v6.2

    • switch expressions decompilation support added
    • init accessors decompilation support added
    • Adds an option to enable aggressive inlining of expressions
    • Adds an option for string.Concat decompilation
    • Adds an option to always qualify member references

    5 details in Everything

28. v6.2-preview2 Prerelease Sep 18, 2020 · release notes

    ILSpy v6.2-preview2 adds C# 9.0 function pointers, foreach extension support, and string.Concat decompilation option.

    └──▷ GET THIS VERSION

    copy

    $ git clone --branch v6.2-preview2 https://github.com/icsharpcode/ILSpy.git
    # already have the repo? check out this version:
    $ git checkout v6.2-preview2

    • Adds string.Concat decompilation option to control how concatenation is rendered
    • Adds support for decompiling C# 9.0 function pointers syntax
    • Adds support for foreach loops using GetEnumerator extension methods

    3 details in Everything

29. v6.2-preview1 Prerelease Aug 31, 2020 · release notes

    Adds decompiler support for C# 7.0–9.0 language features and new expression inlining options

    └──▷ GET THIS VERSION

    copy

    $ git clone --branch v6.2-preview1 https://github.com/icsharpcode/ILSpy.git
    # already have the repo? check out this version:
    $ git checkout v6.2-preview1

    • Adds decompiler support for C# 8.0 await foreach syntax
    • Adds decompiler support for C# 8.0 switch expressions
    • Adds decompiler support for C# 9.0 init accessors
    • Adds option to always qualify member references in output
    • Adds option to enable aggressive inlining of expressions

    +1 more show less

    • Adds variable tracking for ReadyToRun outputs

    6 details in Everything

30. v6.1 Jul 28, 2020 · release notes

    ILSpy v6.1 adds C# 9.0 native ints support and flat base type lists.

    └──▷ GET THIS VERSION

    copy

    $ git clone --branch v6.1 https://github.com/icsharpcode/ILSpy.git
    # already have the repo? check out this version:
    $ git checkout v6.1

    └──▷ HOW TO FIND IT
    View native int support in C# 9 code via the UI tree view
    📍In the main window, expand Base types to see the flat list of all inherited types.
    • Adds support for C# 9.0 Native ints decompilation
    • Adds support for C# 9.0 Attributes on local functions decompilation
    • Updates System.Reflection.Metadata to version 1.8.1
    • Base types treenode now displays a flat list of all base types

    4 details in Everything

31. v6.0 Jul 7, 2020 · release notes

    ILSpy v6.0 adds multi-tab docking, Metadata Explorer, R2R support, and ilspycmd switches

    └──▷ GET THIS VERSION

    copy

    $ git clone --branch v6.0 https://github.com/icsharpcode/ILSpy.git
    # already have the repo? check out this version:
    $ git checkout v6.0

    └──▷ USE IT
    Decompile an assembly with improved variable naming using external PDBPDBA debug symbol file format used by Microsoft's toolchain that maps compiled binaries back to source code, function names, and variable types, letting cyber tools resolve symbols during reverse engineering or memory analysis. files
    shell copy

    ilspycmd --usepdb MyAssembly.dll

    Strip dead code and specify C# language version during decompilation via CLI
    shell copy

    ilspycmd --LanguageVersion 8 --RemoveDeadCode MyAssembly.dll

    • Adds usepdb option to ilspycmd for improved variable naming during decompilation
    • Adds LanguageVersion, RemoveDeadCode, and RemoveDeadStores command-line switches to ilspycmd
    • Introduces Metadata Explorer UI for browsing assembly metadata
    • Adds Ready2Run (R2R) disassembly support with optional UnwindInfo output
    • Enables multi-tab docking interface in the ILSpy GUIGUIA graphical user interface, controls such as windows, buttons and menus. It lets people use software visually rather than entering commands.

    5 details in Everything

    └──▷ BREAKING ON UPGRADE

    • !ilspycmd option debuginfo is renamed to genpdb
32. v6.0-rc1 Prerelease Jun 29, 2020 · release notes

    ILSpy v6.0-rc1 adds C# 9.0 function pointer syntax for calli decompilation and ReadyToRun UnwindInfo output

    └──▷ GET THIS VERSION

    copy

    $ git clone --branch v6.0-rc1 https://github.com/icsharpcode/ILSpy.git
    # already have the repo? check out this version:
    $ git checkout v6.0-rc1

    • Decompile calli instructions using C# 9.0 function pointer syntax
    • Add optional UnwindInfo output in ReadyToRun scenarios (Issue #2043)

    2 details in Everything

33. v5.0 Sep 19, 2019 · release notes

    ILSpy v5.0 adds solution export, BAML decompiler, CLI debug info options, and C# 8.0 support

    └──▷ GET THIS VERSION

    copy

    $ git clone --branch v5.0 https://github.com/icsharpcode/ILSpy.git
    # already have the repo? check out this version:
    $ git checkout v5.0

    • Adds ilspycmd -d|-debuginfo option to emit method stepping information for async code
    • Adds ilspycmd -r|-referencepath option to specify reference paths
    • Adds ability to decompile a set of assemblies to a solution

    3 details in Everything

    └──▷ BREAKING ON UPGRADE

    • !C# 8.0 nullable reference types metadata only supports the latest format; assemblies generated by older preview versions of C# 8 are not supported
34. v5.0-rc1 Prerelease Sep 9, 2019 · release notes

    ILSpy v5.0-rc1 adds support for C# 7.0 Generalized async return types decompilation and a new RemoveDeadStores option.

    └──▷ GET THIS VERSION

    copy

    $ git clone --branch v5.0-rc1 https://github.com/icsharpcode/ILSpy.git
    # already have the repo? check out this version:
    $ git checkout v5.0-rc1

    • Adds the RemoveDeadStores option to control dead store removal during decompilation

    1 detail in Everything

35. v4.0 Jan 16, 2019 · release notes

    v4.0 adds CLI /config: flag, shows warnings for C# reference assemblies, revives IAmbience API, and adds new analyzer/debug providers.

    └──▷ GET THIS VERSION

    copy

    $ git clone --branch v4.0 https://github.com/icsharpcode/ILSpy.git
    # already have the repo? check out this version:
    $ git checkout v4.0

    └──▷ USE IT
    Load a custom configuration file when running ILSpy from the terminal
    shell copy

    ilspy.exe /path/to/assembly.dll /config:C:/custom-settings.xml

    Print a C# style signature using the revived IAmbience API in a plugin
    code copy

    var ambience = new CSharpAmbience();
    string signature = ambience.GetTypeSignature(someTypeReference);

    Implement a custom plugin to provide variable names and sequence points for debug info
    code copy

    public class MyDebugProvider : IDebugInfoProvider
    {
        public DebugInfo GetDebugInfo(Instruction instruction) { /* ... */ }
    }

    • Adds the /config: command-line argument to specify a custom settings file path
    • Shows a warning in the UI when viewing decompiled code from a C# 7.1 reference assembly
    • Revives the IAmbience API via CSharpAmbience for plugin writers to print type names or member signatures
    • Adds new extension method CreateCecilObjectModel to help plugins port to ILSpy 4.0
    • Introduces IAnalyzer API for custom static analysis logic

    +2 more show less

    • Adds IDocumentationProvider interface to allow plugins to supply XML doc comments from custom sources
    • Adds IDebugInfoProvider interface to allow plugins to inject debug info like variable names and sequence points

    7 details in Everything

    └──▷ BREAKING ON UPGRADE

    • !Replaced Mono.Cecil with System.Reflection.Metadata, breaking compatibility with plugins written for ILSpy 3.x
36. v4.0-rc1 Prerelease Jan 5, 2019 · release notes

    ILSpy v4.0-rc1 adds /config: CLI argument and UI options for compiler-generated members and metadata tokens

    └──▷ GET THIS VERSION

    copy

    $ git clone --branch v4.0-rc1 https://github.com/icsharpcode/ILSpy.git
    # already have the repo? check out this version:
    $ git checkout v4.0-rc1

    • New Display all members option in the tree view to include compiler-generated members, getters, and setters.
    • New metadata display options to show tokens in 10-based or hex format.

    2 details in Everything

37. v3.2.0 Jul 1, 2018 · release notes

    ILSpy v3.2.0 adds C# 4-7.3 language support and a Visual Studio marketplace add-in

    └──▷ GET THIS VERSION

    copy

    $ git clone --branch v3.2.0 https://github.com/icsharpcode/ILSpy.git
    # already have the repo? check out this version:
    $ git checkout v3.2.0

    • Visual Studio add-in now available via the Visual Studio Marketplace for direct installation.
    • Decompiler engine gains native support for C# 4.0 dynamic binding and named arguments.
    • Decompiler engine gains support for C# 7.0 tuple types.
    • Decompiler engine supports decompilation of attributes on backing fields of properties (C# 7.3).
    • Search results UI now uses a ListView with two columns and sortable headers.

    5 details in Everything

38. v3.2-beta Prerelease Jun 11, 2018 · release notes

    ILSpy v3.2-beta adds Open in ILSpy VS addin, C# 4/7 decompilation, and search sorting

    └──▷ GET THIS VERSION

    copy

    $ git clone --branch v3.2-beta https://github.com/icsharpcode/ILSpy.git
    # already have the repo? check out this version:
    $ git checkout v3.2-beta

    • Open in ILSpy Visual Studio addin for project explorer nodes (references, NuGetNuGetMicrosoft's package manager for .NET, hosting a public registry of reusable libraries so tools can pull in dependencies without bundling or manually maintaining third-party code.) and text editor
    • C# 4.0 Dynamic binding support
    • C# 4.0 Named arguments support
    • C# 7.0 Tuple types support
    • C# 7.3 Attributes on backing fields of properties support

    +1 more show less

    • Sorted search results via ListView column headers

    6 details in Everything

39. v3.1-final Apr 8, 2018 · release notes

    ILSpy v3.1 adds C# 7.2/7.1 support, VS MEF migration, and type system metadata

    └──▷ GET THIS VERSION

    copy

    $ git clone --branch v3.1-final https://github.com/icsharpcode/ILSpy.git
    # already have the repo? check out this version:
    $ git checkout v3.1-final

    └──▷ HOW TO FIND IT
    Select the target C# language version when decompiling code to match specific compiler features.
    📍Use the Language version selection UI dropdown in ILSpy
    Inspect low-level metadata identifiers for types during reverse engineering.
    📍Examine the type system node view for metadata tokens
    • Language version selection UI feature for choosing target language versions
    • Switch to VS MEF for extension architecture
    • Adds metadata tokens to the type system
    • Lazy-loading support for nested types in TypeSystem
    • Support for mcs and vbc in test infrastructure

    5 details in Everything

    └──▷ BREAKING ON UPGRADE

    • !VSIX drops support for Visual Studio 2015
40. v3.1-beta1 Prerelease Mar 12, 2018 · release notes

    ILSpy v3.1-beta1 adds C# 6-7.2 decompilation, Mono mcs codegen improvements, and VS MEF migration.

    └──▷ GET THIS VERSION

    copy

    $ git clone --branch v3.1-beta1 https://github.com/icsharpcode/ILSpy.git
    # already have the repo? check out this version:
    $ git checkout v3.1-beta1

    └──▷ HOW TO FIND IT
    Use the new language version selector in the UI to force decompilation output compatible with older C# standards.
    📍In ILSpy, navigate to the Language Version dropdown in the options panel and select a specific C# version (e.g., 6.0).
    • Language version selection UI feature allows choosing the target C# language version for decompilation output
    • Adds support for decompiling C# 7.2 private protected access modifiers
    • Adds support for decompiling C# 7.2 conditional ref expressions
    • Adds support for decompiling C# 7.1 async Main entry points
    • Adds support for decompiling C# 7.0 out variables

    +6 more show less

    • Adds support for decompiling C# 7.0 ref returns and locals
    • Adds support for decompiling C# 6.0 string interpolation
    • Adds support for decompiling C# 6.0 await in catch / finally blocks
    • Adds support for decompiling C# 6.0 expression-bodied members
    • Adds support for decompiling C# 6.0 null propagator (null-conditional operator)
    • Improved Mono mcs CodeGen output for switch, lock, and foreach constructs

    11 details in Everything

    └──▷ BREAKING ON UPGRADE

    • !VSIX extension drops support for Visual Studio 2015
41. 3.0.2 Jan 24, 2018 · release notes

    ILSpy 3.0.2 improves downstream consumer support with net45 and method-less type decompilation

    └──▷ GET THIS VERSION

    copy

    $ git clone --branch 3.0.2 https://github.com/icsharpcode/ILSpy.git
    # already have the repo? check out this version:
    $ git checkout 3.0.2

    • Adds TFM net45 support for the ICSICSIndustrial Control Systems — hardware and software that monitor and control physical processes like power grids, pipelines, and manufacturing lines, making them a target for cyber tools focused on operational technology environments..Decompiler API

    1 detail in Everything

42. 2.3 Mar 9, 2015 · release notes

    ILSpy 2.3 adds regex search, type/member/constant filtering, and a Used by analyzer node.

    └──▷ GET THIS VERSION

    copy

    $ git clone --branch 2.3 https://github.com/icsharpcode/ILSpy.git
    # already have the repo? check out this version:
    $ git checkout 2.3

    └──▷ HOW TO FIND IT
    Search for all members using a regex pattern directly in the main UI textbox.
    📍Type m:.*InitializeComponent into the search box to filter only matching members.
    Find all constants in an assembly without leaving the current view.
    📍Type c:True into the search box to filter for constant values.
    Inspect which types reference a specific class via the new analyzer node.
    📍Right-click a type in the tree and select the Used by analyzer node.
    • shell
    • Adds regex support to the UI search box
    • Adds direct type selector (t:), member selector (m:), and constant selector (c:) in the search textbox
    • Adds a Used by analyzer node to types
    • Shows assembly version next to the caption in tree nodes

    5 details in Everything

43. 2.2 Jun 29, 2014 · release notes

    ILSpy 2.2 adds brace folding, .ico image viewing, and metadata token display

    └──▷ GET THIS VERSION

    copy

    $ git clone --branch 2.2 https://github.com/icsharpcode/ILSpy.git
    # already have the repo? check out this version:
    $ git checkout 2.2

    └──▷ HOW TO FIND IT
    Enable folding on all braces for faster code navigation
    📍Options › Source Code Viewer › Enable Fold on braces
    View multiple images inside an ICO file directly in ILSpy
    📍Right-click .ico resource › View Images
    Generate AssemblyInfo.cs when decompiling to a VS project
    📍Decompile › Visual Studio Project › [Target]
    • Adds option to fold code on all braces via CodeView.FoldOnBraces
    • Adds context menu with folding commands in the code view pane
    • Enables displaying all images contained within .ico resources
    • Decompiling as a Visual Studio project now generates AssemblyInfo.cs file
    • Adds option to display metadata tokens in the tree view

    5 details in Everything