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    <p>An alternative to passing the constructor arguments at resolve-time is to encode those arguments in the registration function:</p> <pre><code>builder .Register(c =&gt; new ConnectionFactory("127.0.0.1", 80)) .As&lt;IConnectionFactory&gt;() .SingleInstance(); </code></pre> <p>Autofac will use that function whenever it needs to create the connection factory instance.</p> <p>Since we configured <code>ConnectionFactory</code> as <code>SingleInstance</code>, it will be shared amongst all components which depend on <code>IConnectionFactory</code>. This means <code>ConnectionFactory</code> needs to keep its own state between calls to <code>CreateConnection</code>:</p> <pre><code>public class ConnectionFactory : IConnectionFactory { private int _fromPort; public ConnectionFactory(string ip, int fromPort) { ... _fromPort = fromPort; } public IConnection CreateConnection() { return new Connection(ip, _fromPort++); } } </code></pre> <p>If you have a one-off <code>ConnectionFactory</code> which, say, uses a different IP, you can use a named registration:</p> <pre><code>builder .Register(c =&gt; new ConnectionFactory("192.168.0.1", 80)) .Named&lt;IConnectionFactory&gt;("AlernateConnectionFactory") .SingleInstance(); </code></pre> <p>When you want a component to use that particular factory instead of the default one, you can use the <a href="http://code.google.com/p/autofac/wiki/TypedNamedAndKeyedService" rel="noreferrer"><code>ResolveNamed</code> method</a>:</p> <pre><code>builder.Register(c =&gt; new Foo(c.ResolvedNamed&lt;IConnectionFactory&gt;("AlernateConnectionFactory"))); </code></pre> <p>This is a handy technique to configure a type in multiple ways and use them in specific places.</p>
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    1. COI cannot believe I didn't think about registering an instance instead of the class, the concept is so simple and just what I need. *slaps forehead* Thank you!
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    2. COwhat if the paramaters are not constant?
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    3. CO@sebas: I generally organize these kinds of registrations into modules. The modules accept configuration parameters like URLs and ports in their constructors and use them in the registrations. See this answer of mine for the specific approach: http://stackoverflow.com/questions/3587380/dependency-injection-and-appsettings/3592370#3592370
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