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    <p>You can detect if an object has a property without having to use the dynamic features of C# 4.0 - instead using the reflection features that have been around for a while (I know at least .NET 2.0, not sure about &lt; 2.0)</p> <pre><code>PropertyInfo info = codeObject.getType().GetProperty( "LinePragma", BindingFlags.Public | BindingFlags.Instance ) </code></pre> <p>If it the object does not have the property, then GetProperty() will return null. You can do similar for fields ( GetField() ) and methods ( GetMethod() ).</p> <p>Not only that, but once you have the PropertyInfo, you can use it directly to do your set:</p> <pre><code>info.SetValue(codeObject, new CodeLinePragma(), null); </code></pre> <p>If you're not sure whether the property has a set method, you could take the even safer route:</p> <pre><code>MethodInfo method = info.GetSetMethod(); if(method != null) method.Invoke(codeObject, new object[]{ new CodeLinePragma() }); </code></pre> <p>This also gives you the added benefit of being a little more performant over the lookup overhead of the dynamic call (can't find a reference for that statement, so I'll just float it out there).</p> <p>I suppose that doesn't answer your question directly, but rather is an alternative solution to accomplish the same goal. I haven't actually used #4.0 features yet (even though I'm a huge fan of the dynamic typing available in Ruby). It certainly not as clean/readable as the dynamic solution, but if you don't want to throw an exception it may be the way to go.</p> <p>EDIT: as @arbiter points out, "This is valid only for native .net dynamic objects. This will not work for example for IDispatch."</p>
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    1. COThis is valid only for native .net dynamic objects. This will not work for example for IDispatch.
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    2. CO@arbiter ahh, good point. Clearly demonstrating my lack of experience in actually using .NET 4.0. +1
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    3. COI don't think this will work, see my answer below
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