GSoC/GCI Archive
Google Code-in 2010 Mono Project

Gendarme rule to promote the use of Uri over strings

completed by: Nick Rioux

mentors: spouliot


Gendarme is a static analysis tool to find problems in .NET software. Gendarme inspects executables and libraries that contain code in ECMA CIL format (Mono and .NET) and looks for common problems with the code, problems that compiler do not typically check or have not historically checked.



The task is to write a Gendarme rule that ensure URI are used (at least as overloads for methods) instead of strings. This rule would provide the same features as the three (3) following FxCop rules:

(a) CA1054 : URI parameters should not be strings

(b) CA1055 : URI return values should not be strings

(c) CA1056 : URI properties should not be strings



To complete the task the student must provide:

*  the rules, written in C#. The source code must follow the Mono source code guidelines (available at Also a 'self-check' must be done one the code (i.e. you need to run gendarme on your own code) and the defects, if any, must be fixed (in doubt please ask for guidance on IRC).

* its documentation (in-source xmldoc) that includes 'good' and 'bad' examples; and

* the unit tests (also in C# using the gendarme helpers around NUnit) proving the rule is working as intended

Once ready the files (or the patch) can be submitted to the mentor for review.



* In order to avoid misunderstandings you should start by writing your unit tests and ask for a review of them. That will quickly tell you if you're on the right path to solve the problem.

* Gendarme provides hundreds of rules that can be used as example, here's one





* Gendarme web site:

* Mailing-list / discussions:

* IRC: #gendarme on GimpNET