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    <p>Here's the factory with an observer - seems to do the trick and avoids newing the "controller" inside my themed UI.</p> <pre><code> interface ifoo { void bar(); } class foo : ifoo { public void bar() { Console.Write("do a foo type thing"); } } class foo2 : ifoo { public void bar() { Console.Write("do a foo2 type thing"); } } class needsAnIfoo { public event EventHandler SomethingIFooCanDealWith; System.Threading.Timer _timer; public needsAnIfoo() { _timer = new System.Threading.Timer(MakeFooDoSomething, null, 0, 1000); } void MakeFooDoSomething(Object state) { if (SomethingIFooCanDealWith != null) { SomethingIFooCanDealWith(this,EventArgs.Empty); }; } } class fooFactory { needsAnIfoo _needsAnIfoo = new needsAnIfoo(); Dictionary&lt;String, ifoo&gt; _themedFoos = new Dictionary&lt;string,ifoo&gt;(); ifoo _lastFoo = null; public void RegisterFoo(String themeName, ifoo foo) { _themedFoos.Add(themeName, foo); } public ifoo GetThemedFoo(String theme) { if (_lastFoo != null) { _needsAnIfoo.SomethingIFooCanDealWith -= (sender, e) =&gt; _lastFoo.bar(); }; ifoo newFoo = _themedFoos[theme]; _needsAnIfoo.SomethingIFooCanDealWith += (sender, e) =&gt; newFoo.bar(); _lastFoo = newFoo; return newFoo; } } static void Main(string[] args) { fooFactory factory = new fooFactory(); factory.RegisterFoo("CompanyA", new foo()); factory.RegisterFoo("CompanyB", new foo2()); ifoo foo = factory.GetThemedFoo("CompanyA"); Console.Write("Press key to switch theme"); Console.ReadKey(); foo = factory.GetThemedFoo("CompanyB"); Console.ReadKey(); } </code></pre>
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    1. POUsing a class in its constructor C# - Does it smell?
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    1. USDaniel James Bryars
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    1. COThis isn't really a factory - this is more akin to the 'Flyweight Factory' as proposed by Gamma et. al. (p198). A textbook factory pattern is used to build new objects; not to provide references to existing objects. That being said, patterns are guidelines. I believe that this snippet is much improved from the original - and it is a pattern applicable to, say, real-time switching between themes (rather than selected at start-up, which a textbook factory would be more suited to).
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      1. USJosh
    2. COSorry - this is a factory; just not a textbook factory. Not in any way bad; just clarifying the intent of the Factory pattern! :D
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