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.