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    <p>Castle Windsor is an inversion of control tool. There are others like it.</p> <p>It can give you objects with pre-built and pre-wired dependencies right in there. <strong>An entire object graph created via reflection and configuration rather than the "new" operator.</strong></p> <p>Start here: <a href="http://tech.groups.yahoo.com/group/altdotnet/message/10434" rel="noreferrer">http://tech.groups.yahoo.com/group/altdotnet/message/10434</a></p> <hr> <p>Imagine you have an email sending class. EmailSender. Imagine you have another class WorkflowStepper. Inside WorkflowStepper you need to use EmailSender.</p> <p>You could always say <code>new EmailSender().Send(emailMessage);</code></p> <p>but that - the use of <code>new</code> - creates a TIGHT COUPLING that is hard to change. (this is a tiny contrived example after all)</p> <p>So what if, instead of newing this bad boy up inside WorkflowStepper, you just passed it into the constructor?</p> <p>So then whoever called it had to new up the EmailSender.</p> <p><code>new WorkflowStepper(emailSender).Step()</code></p> <p>Imagine you have hundreds of these little classes that only have one responsibility (google SRP).. and you use a few of them in WorkflowStepper:</p> <p><code>new WorkflowStepper(emailSender, alertRegistry, databaseConnection).Step()</code></p> <p>Imagine not worrying about the details of <code>EmailSender</code> when you are writing <code>WorkflowStepper</code> or <code>AlertRegistry</code></p> <p>You just worry about the concern you are working with. </p> <p>Imagine this whole graph (tree) of objects and dependencies gets wired up at RUN TIME, so that when you do this:</p> <p><code>WorkflowStepper stepper = Container.Get&lt;WorkflowStepper&gt;();</code></p> <p>you get a real deal <code>WorkflowStepper</code> with all the dependencies automatically filled in where you need them. </p> <h2>There is no <code>new</code></h2> <p>It just <em>happens</em> - because it knows what needs what. </p> <p>And you can write fewer defects with better designed, DRY code in a testable and repeatable way.</p>
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    1. POWhat is Castle Windsor, and why should I care?
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    1. USRobert Harvey
    1. USMatt Hinze
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    1. COAWESOME! Well written! NOW I'm excited about it.
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      1. USDavid Hill
    2. CODamn, I want to upvote your post twice.
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      1. USDavid Hill
    3. COThanks. There's a lot more to it. I picked a very simple and painfully concrete example. You can use interfaces to switch out implementations. You can auto-configure entire assemblies. You can specify lifecycles like singleton or per-http-request, etc. Keep going - it will change your work.
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