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<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Dependency Injection with Ninject</title>
<meta name="description" content="A short presentation about dependency injection with Ninject">
<meta name="author" content="Paul Zerkel">
<meta name="apple-mobile-web-app-capable" content="yes" />
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</head>
<body>
<div class="reveal">
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<div class="slides">
<section>
<h1>Dependency Injection with Ninject</h1>
<h3>plus IoC and other stuff!</h3>
<h4>Paul Zerkel</h4>
<p>
<small>11/7/2013</small>
</p>
</section>
<section>
<h2>What is Ninject?</h2>
<p>
Ninject is an open source dependency injection framework for the .NET platform. It is powerful but also designed to be easy enough to use on <em>all</em> projects.
</p>
</section>
<section>
<h2>What is Inversion of Control?</h2>
<p>
Inversion of Control (IoC) is an object oriented programming technique where collaborating objects work through abstractions and the implementation of those
abstractions are not known at run-time.
</p>
<br>
<br>
<h3>IoC helps keep objects loosely coupled</h3>
</section>
<section>
<h2>Examples of IoC</h2>
<ul>
<li class="fragment"><b>Dependency Injection</b></li>
<li class="fragment">Service Locator</li>
<li class="fragment">Factory Pattern</li>
</ul>
</section>
<section>
<h2>What is Dependency Injection?</h2>
<p>
Dependency Injection is a form of Inversion of Control where an object receives required objects from an external source.
</p>
</section>
<section>
<h2>DI Example</h2>
<pre><code data-trim>
public class TaskFinder
{
private readonly ITaskService service;
public TaskFinder(ITaskService service)
{
this.service = service;
}
public IEnumerable<WorkTask> Find(string email, int minPriority)
{
return service.FindTasks(email)
.Where(x => x.Priority >= minPriority);
}
}
</code></pre>
</section>
<section>
<h2>This looks like a lot of extra work...</h2>
<p>
It would be, but that is where a DI framework will help.
</p>
</section>
<section>
<h2>How?</h2>
<p>
Ninject ...
</p>
<ul>
<li class="fragment">Uses a fluent interface to bind types to what will implement them.</li>
<li class="fragment">Manages the creation of objects and their dependencies.</li>
<li class="fragment">Also manages the creation of dependencies and their dependencies (and so on).</li>
<li class="fragment">Handles the lifetime of objects.</li>
</ul>
</section>
<section>
<h2>Binding Examples</h2>
<ul>
<li class="fragment">
Simple Binding
<pre style="width:100%"><code data-trim>
Bind<ITaskService>().To<SimpleTaskService>();
</code></pre>
</li>
<li class="fragment">
Binding with a constructor argument
<pre style="width:100%"><code data-trim>
Bind<ITaskService>>().To<ExchangeService>()
.WithConstructorArgument("url",
new Uri("http://anotherserver.com"));
</code></pre>
</li>
<li class="fragment">
Binding with context
<pre style="width:100%"><code data-trim>
Bind<IRetryPolicy>().To<RandomRetryPolicy>().WhenInjectedInto<LoggingRetryPolicy>();
</code></pre>
</li>
</ul>
</section>
<section>
<h2>Kernel</h2>
<p>
The Kernel allows you to retrieve objects that are fully constructed from Ninject.
</p>
</section>
<section>
<h2>Kernel Example</h2>
<pre><code data-trim>
var taskFinder = kernel.Get<TaskFinder>();
</code></pre>
</section>
</div>
</div>
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