Metaprogramming Library for the C# Programming Language

As software becomes more and more complex, tool-support for software analysis and transformation is increasingly important. While such tools exist for languages like Java, Smalltalk and C++, the support for C# is poor. In this paper we present Recoder.C#, a library for static metaprogramming of C# programs. Recoder.C# constructs a fully cross-referenced syntax tree and it supports transformation of this syntax tree. The Recoder parser is fully inversive, which means that the original code layout (comments, indentation) is preserved as far as possible. Recoder.C# can be used to build sophisticated analysis and transformation tools, including software metrics and refactorings.