Code sample based on the talk "All yours DLLs are belong to us"

Red Gate Reflector - IL Decompiler

Gray Wolf - IL Rewriter/Reverse Engineering Tool

Code Connect - Visual Studio plugin dependant on flawed DLL.

Code Connect's editors are IElisionBuffers. This means they project text from one source document (A typical C# file) to our custom editors. They inherit from IProjectionBufferBase as shown in the inheritance hierarchy below:

Unfortunately, within Visual Studio 2013's copy of of Microsoft.CodeAnalysis.EditorFeatures.dll lived a frustrating bug.

The following function was supposed to work out how two buffers were related to one another. It would answer questions like "Is startBuffer the source buffer for destinationBuffer?" However, instead of casting the buffer to IProjectionBufferBase, it cast to IProjectionBuffer. This meant that this case failed for all Code Connect's IElisionBuffers.

At this point, Microsoft was no longer actively supporting Roslyn for Visual Studio 2013. So this bug was not getting fixed. We needed to get Code Connect out to our users, so we patched this bug with Mono.Cecil.

This project simply fixes the improper cast in the above code.