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)

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.

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

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

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.