Gendarme's rules about LINQ-related design issues are located in the Gendarme.Rules.Design.Linq.dll assembly. Latest sources are available from anonymous SVN (http://anonsvn.mono-project.com/viewcvs/trunk/mono-tools/gendarme/rules/Gendarme.Rules.Design.Linq/).

Rules

AvoidExtensionMethodOnSystemObjectRule

Extension methods should not be used to extend System.Object. Such extension methods cannot be consumed by some languages, like VB.NET, which use late-binding on System.Object instances.

Bad example:

public static class Extensions {
    public static string ToDebugString (this object self)
    {
        return String.Format ("'{0}', type '{1}', hashcode: {2}",
        self.ToString (), self.GetType (), self.GetHashCode ());
    }
}

Good example:

public static class Extensions {
    public static string ToDebugString (this DateTime self)
    {
        return String.Format ("'{0}', type '{1}', hashcode: {2}",
        self.ToString (), self.GetType (), self.GetHashCode ());
    }
}

Notes

• This rule is available since Gendarme 2.2

Feedback

Please report any documentation errors, typos or suggestions to the Gendarme Google Group (http://groups.google.com/group/gendarme). Thanks!