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copied!<p>C# poses a problem with NVIs by taking away multiple inheritance. While I do think that multiple inheritance generates more evil than good, it is necessary (in most cases) for NVI. The simplest thing that jumps to mind: a class in C# cannot implement more than one NVI. Once one discovers this unpleasant <strong>aspect</strong> of C#/NVI tandem, it becomes much easier to give up NVIs than C#.</p> <p>And by the way, speaking about <strong>aspects</strong>. That's a very interesting concept, and it's aim is exactly the same as that of NVIs, only it attempts to look at the "true essense" of the issue and address it "properly", so to say. <a href="http://en.wikipedia.org/wiki/Aspect-oriented_programming" rel="noreferrer">Take a look</a>.</p> <p>And as far as .NET Framework goes, there is a mechanism to do just that: inject code that is "orthogonal", so to say, to the main logic at hand. I'm talking about all that MarshalByRef/TransparentProxy business, I'm sure you've heard of it. It does seriously impact performance, though, so no big luck here.</p> <p>There have also been numerous attempts to implement the same concept through other techniques, from building facades to the dirty business mentioned above to post-processing of MSIL.</p> <p>The latter approach happens to appeal to yours truly the most, since it can be made transparent (by incorporating needed steps into one's build routine), it doesn't affect performance (more than is absolutely necessary to actually execute the "orthogonal" code) and it does not involve some kind of "hacking" or reverse engineering, since MSIL is open and well documented.</p> <p><a href="http://www.sharpcrafters.com/aop.net/compiletime-weaving" rel="noreferrer">Here</a> one can find these points discussed in more detail, as well as more information and links to actual tools. Using Google for the same purpose is also acceptable. :-)</p> <p>Good luck.</p>

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