Check for breaking changes in APIs

Have you ever had the need to compare interfaces of two versions of the same framework?

If you have, then ApiChange is a tool for you. It’s open source, powerful and easy to use 🙂

I gave it a spin comparing current trunk version 2.9.2 of Lucene.Net with the latest official release version 2.4.0.

I downloaded ApiChange and ran the following command in a command prompt:

ApiChange.exe -Diff -old C:Lucene.Net_2_4_0Lucene.Net.dll -new C:trunkLucene.Net.dll

The output lists all the differences, but here is a summary:

  • 23 public types where removed
  • 96 public types where added
  • 158 public types where changed

Cool little tool with other features such as:

  • Diff public types for breaking changes.
  • Who uses a method?
  • Who uses a type?
  • Who uses implements an interface?
  • Who references me?
  • What format has the binary (32/64, Managed C++, Pure IL, Unmanaged)?
  • Search for all event subscribers and unsubscribers.

It’s based on Mono Cecil – a free IL parser, and not reflection as I initial thought. Go check it out…