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    <p>I've used <a href="http://structuremap.sourceforge.net/Default.htm" rel="noreferrer">structure map</a> quite a bit. The rest of your question is pretty loaded. I'll try to explain the concept in an example.</p> <p>Suppose you created a website that will accept payments through PayPal. PayPal is now a dependency. But you don't want to code against a specific PayPal provider.</p> <p>Instead You would create and code against an interface like this..</p> <pre><code>interface IPaymentProcessor { bool ProcessPayment(amount, ....); } </code></pre> <p>All your paypal code would reside in a class that implements the methods of your interface. <code>PayPalPaymentProcessor</code> for example</p> <p>Now you have an object that you will actually use to process the payments. This could be a Controller(asp.net-mvc, ViewModel-wpf) or just a class as shown here.</p> <pre><code>class PaymentProcessor { private IPaymentProcessor _processor = null; public PaymentProcessor(IPaymentProcessor processor) { _processor = processor; } public bool ProcessTransaction(Transaction trans) { _processor.ProcessPayment(trans.amount, ...); } } </code></pre> <p>This is where an IoC comes in. Instead of you calling the constructor manually, you would let an IoC <em>inject</em> the dependency. </p> <pre><code>PaymentProcessor processor = ObjectFactory.GetInstance&lt;PaymentProcessor&gt;(); </code></pre> <p>This piece of code tells structure map "Anytime you see a constructor that needs an IPaymentProcessor, return a new PayPalPaymentProcessor". </p> <pre><code>ObjectFactory.Initialize(x =&gt; { x.ForRequestedType&lt;IPaymentProcessor&gt;().TheDefaultIsConcreteType&lt;PayPalPaymentProcessor&gt;(); }); </code></pre> <p>All this mapping is separate from your implementation code and you could swap out these at a later point with little refactoring needed. There is a lot more to IoCs, but that is a basic concept. You can automate the injection of constructors to avoid the calls directly to ObjectFactory as well.</p> <p>Hope this helps!</p>
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    1. COThanks for the nice example :). I understand that the last part of the question is a bit broad, but I think you answered that part as well.
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