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    copied!<p>Wherever old-fashioned reflection is used now and code readability has been impaired. And, as you say, some Interop scenarios (I occasionally work with COM).</p> <p>That's pretty much it. If <code>dynamic</code> usage can be avoided, it should be avoided. Compile time checking, performance, etc.</p> <p>A few weeks ago, I remembered <a href="http://blogs.msdn.com/lucabol/archive/2009/02/05/simulating-inumeric-with-dynamic-in-c-4-0.aspx" rel="noreferrer">this article</a>. When I first read it, I was frankly apalled. But what I hadn't realised is that I didn't know how to even <em>use</em> an operator on some unknown type. I started wondering what the generated code would be for something like this:</p> <pre><code>dynamic c = 10; int b = c * c; </code></pre> <p>Using regular reflection, you can't use defined operators. It generated quite a bit of code, using some stuff from a <code>Microsoft</code> namespace. Let's just say the above code is a lot easier to read :) It's nice that it works, but it was also <em>very</em> slow: about 10,000 times slower than a regular multiplication (doh), and about 100 times slower than an <code>ICalculator</code> interface with a Multiply method.</p> <p><strong>Edit</strong> - generated code, for those interested:<br/></p> <pre><code>if (&lt;Test&gt;o__SiteContainer0.&lt;&gt;p__Sitea == null) &lt;Test&gt;o__SiteContainer0.&lt;&gt;p__Sitea = CallSite&lt;Func&lt;CallSite, object, object, object&gt;&gt;.Create( new CSharpBinaryOperationBinder(ExpressionType.Multiply, false, false, new CSharpArgumentInfo[] { new CSharpArgumentInfo(CSharpArgumentInfoFlags.None, null), new CSharpArgumentInfo(CSharpArgumentInfoFlags.None, null) })); b = &lt;Test&gt;o__SiteContainer0.&lt;&gt;p__Site9.Target( &lt;Test&gt;o__SiteContainer0.&lt;&gt;p__Site9, &lt;Test&gt;o__SiteContainer0.&lt;&gt;p__Sitea.Target( &lt;Test&gt;o__SiteContainer0.&lt;&gt;p__Sitea, c, c)); </code></pre>
 

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