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copied!<p>We are injecting (Spring.Net) such functionality into dictionaries by type.</p> <pre><code>IDictionary<Type, IBlahImplementor> blahImplementors; blahImplementors[thingy.GetType()].Do(thingy); </code></pre> <p>This dictionary could be managed by a kind of repository which provides the functionality.</p> <p>As an implementation detail, the implementor usually knows the type it depends on an can provide it itself:</p> <pre><code>interface IBlahImplementor { Type ForType { get; } void Do(object thingy); } </code></pre> <p>Then it is added to the dictionary like this:</p> <pre><code>IEnumerably<IBlahImplementor> blahImplementors; foreach (var implementor in blahImplementors) { blahImplementors.Add(implementor.ForType, implementor); } </code></pre> <hr> <p>Remark: IMHO, it is very important to understand that some things do NOT belong into a class, even if providing subtype-specific implementations would make life much easier.</p> <hr> <p><strong>Edit</strong>: Finally understood your concrete example.</p> <p>It is actually about instancing the right UI control to show the pricing models parameters. It should be possible with the pattern I described above. If you don't have a single UI control for a pricing model, you either create it or you write a UI configurer or something like this which sets up the required controls.</p> <pre><code>interface IPricingModelUiConfigurer { Type PricingModelType { get; } void SetupUi(Control parent, IPricingModel model); } </code></pre>

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