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ILSpy is the open-source .NET assembly browser and decompiler.

Development started after Red Gate announced that the free version of .NET Reflector would cease to exist by end of February 2011.

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Beta Release (ILSpy 1.0.0.943):

• Binaries
• Source Code
• Release Notes

ILSpy requires .NET 4.0.

Test the latest ILSpy builds: Build Server

Get ILSpy plugins from here.

ILSpy Features

• Assembly browsing
• IL Disassembly
• Decompilation to C#
  • Supports lambdas and 'yield return'
  • Shows XML documentation
• Saving of resources
• Search for types/methods/properties (substring)
• Hyperlink-based type/method/property navigation
• Base/Derived types navigation
• Navigation history
• BAML to XAML decompiler
• Save Assembly as C# Project
• Find usage of field/method
• Extensible via plugins (MEF)

ILSpy 1.0 Roadmap

• Support all C# 4.0 features except for expression trees, dynamic, and fixed fields
• Make Analyzer UI easier to use

ILSpy 2.0 Roadmap

• Assembly Lists
• Support the remaining C# 4.0 features
  • Expression trees
  • C# 4.0 "dynamic"
  • Fixed fields ("struct A{ public unsafe fixed int Field[10]; }")
  • Simplify comparison operators on nullables
  • Add casts where required to make C# overload resolution call the correct method
• Debugger Eusebiu's blog, integration builds

ILSpy - Further Down the Road

• Decompile to Visual Basic
• Visual Basic support (pre-info)
• Support C# 5.0 "async"
• Bookmarks
• Decompiling ILSpy with itself and recompiling the result should result in a working ILSpy copy
• Assembly editing capabilities (similar to Reflexil)

Release History

Want to know when major new features are added? When a new stable version is released?

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• 5/29/2011 Beta announcement
• 5/4/2011 M3 announcement
• 4/13/2011 M2 annoucement
• 2/24/2011 M1 (Milestone 1) Release announcement
• 2/16/2011 First Preview announcement
• 2/4/2011 Development Starts (github repository created)

Discussion Forum

http://community.sharpdevelop.net/forums/69.aspx

Please use the forum to discuss issues, feature ideas, et cetera. For bug reporting, either use the forum or if you have a GitHub account, add them directly to https://github.com/icsharpcode/ILSpy/issues

Blog Posts on ILSpy Development

• Daniel Grunwald's blog
• David Srbecky's blog
• Siegfried Pammer's blog

ILSpy Source Code

See https://github.com/icsharpcode/ILSpy

Screencasts, Demo & How To Videos

• Overview of features in ILSpy Build 296 Resolution: 720p

Screenshots

Viewing IL (Build 199)

Navigating Types (Build 199)

Saving Resources (Build 199)

Decompiling a Type to C# (Build 199)

Decompiling method with 'yield return' (Build 528)