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POFxCop: Returning Matrix as Property (C#)
 

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  1. POFxCop: Returning Matrix as Property (C#)
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    <p>I have a static class 'Defaults' which shall hold default matrices that are forwarded to an interface that asks for <code>double[][]</code> in the end. So far I simply put static properties in this class that return <code>double[][]</code>s.</p> <p>Now to make this conform to our company's coding standards, the code must comply to FxCop's rule <a href="http://msdn.microsoft.com/en-US/library/0fss9skc%28v=VS.100%29.aspx#3" rel="nofollow noreferrer">CA1819</a>, which won't allow me to return a jagged array from a property like I did. And instead of arrays, I shall return <code>IList</code> or <code>IEnumerable</code> (as discussed <a href="https://stackoverflow.com/questions/1274914/is-it-bad-form-to-return-arrays-in-c-should-i-return-listt">here</a>).</p> <p>"Fair enough" I thought, so I implemented the property to return <code>IList&lt;IList&lt;double&gt;&gt;</code> (although nested types are uncool too). However, as I said, the interface which I need to work with asks for <code>double[][]</code> matrices in the end.. I have no idea how to get this list of lists into an array of arrays <strong>without explicitly converting back each list</strong>. Of course, I could, but that would create an insane amount of overhead, especially since I don't even access those matrices - I only pass them through to the interface.</p> <p>(PS: I know, it's the Interface's fault, but at the moment we can't change that.)</p> <p>Edit: I found out that using <code>ILists&lt;IList&lt;double&gt;&gt;</code> donesn't help anyway, since it violates <a href="http://msdn.microsoft.com/en-us/library/ms182144.aspx" rel="nofollow noreferrer">CA1006</a>. The easy solution that I took to make FxCop shut up was to make the properties internal. Anyway, the nicer solution is stated below. Alternatively, one may consider to use an indexed property, which is a bit messy in C# though.</p>
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