ILSpy 6.0 Preview 2

UI Improvements

• Ready2Run (by @cshung see https://github.com/icsharpcode/ILSpy/wiki/ILSpy.ReadyToRun)
• Metadata Explorer (see https://github.com/icsharpcode/ILSpy/wiki/Metadata-Explorer)
• Assembly list dropdown in toolbar, enhanced assembly list management
• Add "Reset to defaults" in Options dialog

New Language Features

• Support for generic and static local functions
• C# 7.3 pattern-based fixed statement

Enhancements

• Support VB Select Case on string
• Analyzer follow type forwarders (#1846 by @yyjdelete)

Bug fixes

• Display System.Void as struct (#1835 by @yyjdelete)
• Properly decompile auto events with tuples
• Do not change accessibility of non-transformed local functions
• Improve drag&drop support (#1860)
• Fix bug in stackalloc initializer detection involving Span<decimal> (see #1855 by @yyjdelete)
• Fix DotNetCorePathFinder to properly support netstandard2.1

dotnet ilspycmd Tool

• New option: usepdb (for improved variable naming)
• Breaking change: option debuginfo renamed to genpdb

ILSpy 6.0 Preview 1

BREAKING CHANGES / IN DEVELOPMENT

• The main new UI feature is a multi-tab docking interface. Please put it to the test and report bugs!
• ILSpy 6.0 will require at least .NET 4.7.2 (v5.0 required .NET 4.6.2)

New Language Features

• C# 8.0 Default Interface Methods
• C# 8.0 Async streams (currently not covering await foreach)
• C# 8.0 await using
• C# 8.0 Readonly members

New Features

• Add search features (thanks to @miloush and @sailro)
  • resources (#1707)
  • assemblies (#1708)
  • namespaces (#1736)
  • Add assembly column to search pane (#1690)

Decompiler Engine Improvements & Bugfixes

• Added struct constructor initializer pattern
• DotNetCorePathFinder: Various bug fixes when working with .net core assemblies
• Transform post-increment on float/double (#1769 thanks to @Chicken-Bones)
• Fix extra minus sign when formatting -0 on .NET Core 3.0 (#1790 thanks to @Chicken-Bones)
• Fix sealed modifier on interface methods with no body (#1792 thanks to @Chicken-Bones)
• Fix NullReferenceException when foreach decompilation is turned off (#1754 thanks to @davidwengier)
• Fixed performance problem when using an assembly from a MemoryStream (#1763 thanks to @yyjdelete)

UI Improvements

• New icons (based on VS 2017 icon pack) (#1704 thanks to @Rpinski)
• Use XAML for icons (high DPI)
• Docking and multi tab support (see #1725 and #1801)
• RichText Tooltips (#1654)
• Folding for XAML output (thanks to @jogibear9988)

dotnet ilspycmd Tool

• #1740: Add LanguageVersion, RemoveDeadCode and RemoveDeadStores switches

ILSpy 5.0.2

This is a bug fix release.

• Fix crash while resolving .NET core references
• Respect language settings in display class transformation
• Use specialized generic types if a specialized variable is captured
• Stack overflow when decompiling a bool -> bool? conversion
• Expand using declarations setting was not saved

ILSpy 5.0.1

This is a bug fix release.

• VSIX: Fixes for reference assemblies, type navigation
• PDBgen: Fix for sequence points generation
• Add support for null propagation on array access: arr?[i]
• Additional smaller fixes and improvements

ILSpy 5.0

ILSpy 5.0

New Language Features

• C# 8.0: Nullable Reference Types
• C# 7.3: unmanaged generic constraint
• C# 7.3 Indexing movable fixed buffers: Fixed buffers can be indexed into without first being pinned.
• Use Unsafe intrinsics to represent IL operations that cannot be expressed in C#.
• C# 7.0 Generalized async return types
• C# 7.0 Local functions (#1586)
• C# 7.0 Throw expressions (#1600)

New Features

• Decompile a set of assemblies to a solution (#1550 by @dymanoid)
• New BAML Decompiler
• MSIX for Microsoft Store: @onovotny added build support (including Azure Pipelines).
• Generate VS Windows Forms Designer-compliant code if a method is identified as Windows Forms InitializeComponent
• Added new RemoveDeadStores option.
• Added new AlwaysShowEnumMemberValues option.

Decompiler Engine Improvements & Bugfixes

• Improved stability of decompiler and disassembler on invalid metadata tokens.
• Improved decompilation in case not all types/references are available.
• Added switch-on-string pattern for empty string case.
• Add support for ReadOnlySpan<T> initialization pattern
• Improved decompilation of ref readonly delegates and return types.
• • Improved decompilation of ref typed expressions, in particular ref/in extension methods and in parameters.
• Improved support for Mono yield return state machines and closure types.
• Improved decompilation of LINQ queries
• PDB generator now can emit "method stepping information" for async #1422

Improvements & Bugfixes

• Many minor bug and stability fixes.
• Improved performance in ILInlining step
• VSIX: Fix issue of missing dependencies

UI Improvements

• Avoid blocking the UI when waiting on assembly load while restoring the saved position in the treeview
• Support obfuscated names in treeview and search #1359
• Escape non-printable characters in IL view
• Rework C# decompiler options dialog (unify language settings panel)
• Make indentation of decompiled code configurable.
• Chinese translation by @maikebing (#1299) screenshots
• Small improvements in search panel by @mcpiroman (#1476)
• Show error message if an entity cannot be analyzed instead of crashing.
• Improved linking in the decompiler view:
  • method group / delegate references
  • the constructor of an attribute is reachable, by clicking on the open/close parenthesis.
  • fixed fields are now properly linked
• Added matching bracket highlighting
• Updated to AvalonEdit 6.0 Preview

dotnet ilspycmd Tool

• Add -d|-debuginfo option See Demo app
• Add -r|-referencepath option

Architectural Changes

• We dropped support for all TFMs except netstandard2.0 #1416
• Reactivate many tests from old decompiler

Known issues & limitations

• C# 8.0 nullable reference types metadata only supports the latest format. Note that this is a breaking change and assemblies generated by older preview versions of C# 8 are not supported. (See #1619 (comment))
• Generic local functions are not yet supported (#1588)
• "Open assembly from GAC" may require administrator privileges (#1498)
• Matching bracket highlighting does not yet support all language features that introduce new syntax.

ILSpy 5.0 RC1

New Language Features

• C# 7.0 Generalized async return types

Improvements & Bugfixes

• Added new RemoveDeadStores option.
• Added switch-on-string pattern for empty string case.
• Improved decompilation in case not all types/references are available.
• Many minor bug and stability fixes.

ILSpy 5.0 Preview 4

New Language Features

• C# 7.0 Local functions (#1586)
• C# 7.0 Throw expressions (#1600)

New Features

• Decompile a set of assemblies to a solution (#1550 by @dymanoid)

Improvements & Bugfixes

• C# 8.0 nullable reference types metadata was updated to the latest format. Note that this is a breaking change and assemblies generated by older preview versions of C# 8 are no longer supported.
• Improved decompilation of ref typed expressions, in particular ref/in extension methods and in parameters.
• Improved support for Mono yield return state machines and closure types.
• Improved stability of decompiler and disassembler on invalid metadata tokens.
• Many minor bug and stability fixes. For a complete list of all changes since preview3 see here.

UI Improvements

• Improved linking in the decompiler view:
  • method group / delegate references
  • the constructor of an attribute is reachable, by clicking on the open/close parenthesis.
• Added matching bracket highlighting
• Updated to AvalonEdit 6.0 Preview

Known issues & limitations

• C# 8.0 nullable reference types metadata was updated to the latest format. Note that this is a breaking change and assemblies generated by older preview versions of C# 8 are no longer supported. (See #1619 (comment))
• Generic local functions are not yet supported (#1588)
• "Open assembly from GAC" may require administrator privileges (#1498)
• Matching bracket highlighting does not yet support all language features that introduce new syntax.

ILSpy 5.0 Preview 3

This preview does not include any new language features.

Improvements & Bugfixes

• VSIX: Fix issue of missing dependencies
• MSIX support: @onovotny added build support (including Azure Pipelines). Not published in the store yet, see #1540
• Tests updated to latest Roslyn implementation
• Many minor bug and stability fixes (details)

ILSpy 5.0 Preview 2

New Language Features

• C# 7.3 Indexing movable fixed buffers: Fixed buffers can be indexed into without first being pinned.
• Use Unsafe intrinsics to represent IL operations that cannot be expressed in C#.

Improvements & Bugfixes

• Improved decompilation of ref readonly delegates and return types.
• Improved linking and display of fixed fields in the decompiler view.
• Improved support for C# 8.0 nullable reference types: dynamic?
• Many minor bug and stability fixes.

UI Improvements

• Rework C# decompiler options dialog (unify language settings panel)
• Make indentation of decompiled code configurable.
• Chinese translation by @maikebing (#1299) screenshots
• Small improvements in search panel by @mcpiroman (#1476)
• Show error message if an entity cannot be analyzed instead of crashing.

ILSpy 5.0 Preview 1

New Language Features

• C# 8.0: Nullable Reference Types
• C# 7.3: unmanaged generic constraint

Improvements & Bugfixes

• PDB generator now can emit "method stepping information" for async #1422
• Generate VS Windows Forms Designer-compliant code if a method is identified as Windows Forms InitializeComponent
• Add support for ReadOnlySpan initialization pattern
• Improved decompilation of LINQ queries
• Improved performance in ILInlining step
• New BAML Decompiler

UI Improvements

• Avoid blocking the UI when waiting on assembly load while restoring the saved position in the treeview
• Support obfuscated names in treeview and search #1359
• Escape non-printable characters in IL view
• Reactivate SearchMsdnContextMenuEntry

dotnet ilspycmd Tool

• Add -d|-debuginfo option See Demo app
• Add -r|-referencepath option

Architectural Changes

• We dropped support for all TFMs except netstandard2.0 #1416
• Reactivate many tests from old decompiler