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    <p>I respectually disagree with the notion that link extension methods should be side-effect free (not only because they aren't, any delegate can perform side effects).</p> <p>Consider the following:</p> <pre><code> public class Element {} public Enum ProcessType { This = 0, That = 1, SomethingElse = 2 } public class Class1 { private Dictionary&lt;ProcessType, Action&lt;Element&gt;&gt; actions = new Dictionary&lt;ProcessType,Action&lt;Element&gt;&gt;(); public Class1() { actions.Add( ProcessType.This, DoThis ); actions.Add( ProcessType.That, DoThat ); actions.Add( ProcessType.SomethingElse, DoSomethingElse ); } // Element actions: // This example defines 3 distict actions // that can be applied to individual elements, // But for the sake of the argument, make // no assumption about how many distict // actions there may, and that there could // possibly be many more. public void DoThis( Element element ) { // Do something to element } public void DoThat( Element element ) { // Do something to element } public void DoSomethingElse( Element element ) { // Do something to element } public void Apply( ProcessType processType, IEnumerable&lt;Element&gt; elements ) { Action&lt;Element&gt; action = null; if( ! actions.TryGetValue( processType, out action ) ) throw new ArgumentException("processType"); foreach( element in elements ) action(element); } } </code></pre> <p>What the example shows is really just a kind of late-binding that allows one invoke one of many possible actions having side-effects on a sequence of elements, without having to write a big switch construct to decode the value that defines the action and translate it into its corresponding method.</p>
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    1. COThere's a difference between whether an extension method CAN have side-effectsand whether it SHOULD have. You're only pointing out that it can have, while there may be very good reasons to propose that they should not have side effects. In functional programming, all functions are side-effect free, and when using functional programming constructs you may want to assume that they are.
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      1. USDave Van den Eynde
 

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