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    <p>Entirely untested:</p> <pre><code>public class ViewModelBuilderFactory { public IViewModelBuilder GetViewModelBuilder (string docType, IRepository repository) { switch (docType) { case "ProgressNotes": return new ProgressNotesViewModelBuilder(repository); case "Labs": return new LabsViewModelBuilder(repository); default: throw new ArgumentException( string.Format("docType \"{0}\" Invalid", docType); } } } public interface IViewModelBuilder { TreeViewModel GetDocTreeViewModel(); WorkSpace GetWorkSpace(Patient patient); } public class LabsViewModelBuilder : IViewModelBuilder { private IRepository _repository; public LabsViewModelBuilder(IRepository repository) { _repository = repository; } public TreeViewModel GetDocTreeViewModel() { return new TreeViewModel(_repository.GetPatientLabs()); } public Workspace GetWorkspace(Patient patient) { return LabViewModel.NewLabViewModel(patient); } } public class ProgressNotesViewModelBuilder : IViewModelBuilder { private IRepository _repository; public ProgressNotesViewModelBuilder(IRepository repository) { _repository = repository; } public TreeViewModel GetDocTreeViewModel() { return new TreeViewModel(_repository.GetPatientProgressNotes()); } public Workspace GetWorkspace(Patient patient) { return ProgressNoteViewModel.NewProgressNoteViewModel(patient); } } </code></pre> <p>Now your calling code is:</p> <pre><code>ViewModelBuilderFactory factory = new ViewModelBuilderFactory(); IViewModelBuilder modelBuilder = factory.GetViewModelBuilder(docType, repository); this.DocTreeViewModel = modelBuilder.GetDocTreeViewModel(); Workspace workspace = modelBuilder.GetWorkspace(patient); this.Workspaces.Add(workspace); this.SetActiveWorkspace(workspace); </code></pre> <p>[4 edits since first post; keep seeing mistakes]</p> <p>[Further Edit noting that you're using Castle IOC]</p> <p>In your Castle xml configuration, you could add (and I'm working on only a vague knowledge of Castle here)</p> <pre><code>&lt;component id="ProgressNotesViewModelBuilder" type="MyNamespace.ProgressNotesViewModelBuilder, MyAssembly"&gt; &lt;parameters&gt; &lt;!-- reference to repository here --&gt; &lt;/parameters&gt; &lt;/component&gt; &lt;component id="LabsViewModelBuilder" type="MyNamespace.LabsViewModelBuilder, MyAssembly"&gt; &lt;parameters&gt; &lt;!-- reference to repository here --&gt; &lt;/parameters&gt; &lt;/component&gt; </code></pre> <p>Then you don't need the ViewModelBuilderFactory, you can just replace</p> <pre><code>IViewModelBuilder modelBuilder = factory.GetViewModelBuilder(docType, repository); </code></pre> <p>with</p> <pre><code>IViewModelBuilder modelBuilder = (IViewModelBuilder) container.Resolve(docType + "ViewModelBuilder"); </code></pre> <p>Now you don't need your switch statement at all.</p> <p>However, it's worth noting that switches aren't evil, they just smell bad and like all bad smells should be isolated from everything that smells good; that's what the Factory pattern is intended to achieve.</p>
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    1. POHow do I replace a switch statement with IOC so I can maintain SOLID principle
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    1. POHow do I replace a switch statement with IOC so I can maintain SOLID principle
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    1. COYarg beaten by only a few minutes. You could also have each of the ModelBuilder classes implement the `IViewModelBuilder` interface. If you really want an IoC container involved you could use the docType to differentiate named configurations but might be a bit too much business logic configured into the Container.
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    2. COMeant to have them implement the interface, it makes no sense otherwise. Edited.
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    3. COThe change to fit in with the Inversion of Control Principle is to depend on the `IViewModelBuilder` instead of the concrete implementations `ProgressNotesViewModelBuilder` or `LabsViewModelBuilder`.
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