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copied!<p>If the classes that you present in your example code are accurate (i.e. there is not a bunch more methods and properties). Then the simplest possible solution might work, and you can get rid of a number of classes / dependencies on classes.</p> <p>A simple solution, that does not rely on a framework/container would be:</p> <pre><code>public static class FormsProcessing { private static ConcurrentDictionary<string, Func<FormProcessor>> _registeredProcessors = new ConcurrentDictionary<string, Func<FormProcessor>>(); public delegate bool FormProcessor(XmlDocument form); public static void RegisterProcessor(string formKey, Func<FormProcessor> formsProcessorFactory) { _registeredProcessors.AddOrUpdate(formKey, formsProcessorFactory, (k, current) => formsProcessorFactory); } public static FormProcessor GetProcessorFor(string formKey) { Func<FormProcessor> processorFactory; if (_registeredProcessors.TryGetValue(formKey, out processorFactory); return processorFactory(); return null; } public static bool Process(string formKey, XmlDocument form) { var processor = GetProcessorFor(formKey); if (null == processor) throw new Exception(string.Format("No processor for '{0}' forms available", formKey)); return processor(form); } } </code></pre> <p>Usage: </p> <pre><code>namespace Web.Services { public class MyServiceClass { public bool AddForm(XmlDocument form, string formName) { return FormsProcessing.Process(formName, form); } } } </code></pre> <p>It is simple and explicit, and does not need or expose any dependency on some structure of <code>IPFormDataContext</code> and <code>IPFormDataStrategy</code> classes. The only explicit dependency you have is on a delegate that has the <code>FormProcessor</code> signature.</p> <p>Similar to a container, you will need to perform the registrations somewhere:</p> <pre><code>FormsProcessing.RegisterProcessor("FormA", () => new FormAStrategy().DoWork); FormsProcessing.RegisterProcessor("FormB", () => new FormBStrategy().DoWork); </code></pre> <p>Alternatively it would be easy to add some form of (convention based) auto registration by scanning assemblies for the convention (e.g. an interface signature).</p>

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