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    <p>Actually most of the extension methods in the BCL apply not to classes, but to interfaces, which is a key power of extension methods.</p> <p>For example, almost all of LINQ to objects is implemented as extensions to the <code>IEnumerable&lt;T&gt;</code> interface, and not to the classes <code>List&lt;T&gt;, HashSet&lt;T&gt;</code>, etc.</p> <p>Because interfaces do not have functionality (just a contract), adding an extension method to a interface gives you a way to an interface itself. This is especially handy when the implementation need only know of the interface for it's use and not implementation specifics (per se).</p> <p>Microsoft <em>does</em> add new methods in their BCL classes all the time (though of course they avoid breaking changes wherever possible). But I believe the majority of their extension method use in the BCL is on interfaces and not for adding functionality that could easily be added with a new method directly to the class/struct.</p> <p>So, in short, when Microsoft chooses to add functionality to a single <code>class</code> (or family with a common base class), they'd probably just add the method directly (all things being equal), but if they wanted to apply a new method to all implementations of a given interface, they'd probably use an extension method on that interface.</p> <p>Also keep in mind this! Because Microsoft gave us extension methods, it applies to classes they didn't create as well! For example, any class that you create that implements <code>IEnumerable&lt;T&gt;</code> gets the functionality of LINQ as well as a bonus, even though you inherit no common base classes, etc. </p>
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    1. USJames Michael Hare
    1. USJames Michael Hare
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    1. COhttp://msdn.microsoft.com/en-us/library/system.string.aspx
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    2. CO@LaysomeSmith: Those extension methods are there because of `IEnumerable<T>`, remember that `string` implements `IEnumerable<char>`. Click on most of them and you'll see that they apply to `IEnumerable<TSource>`, not `string` directly...
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    3. COWhatever. They could have added all these extension methods as methods? Is it not possible at all to implement these extension method as methods for Microsoft?
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