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copied!<p>Sure - the <a href="http://msdn.microsoft.com/en-us/library/microsoft.visualstudio.ole.interop.iserviceprovider.aspx" rel="nofollow noreferrer">IServiceProvider</a> interface has been part of the Framework since 1.0. This isn't DI as it is typically discussed here (using a "kernel"), but it is IoC using the Service Locator pattern.</p> <p>If you dig into any of the Windows Forms Designer code, you'll see it peppered liberally with lines like this one:</p> <pre><code>IDesignerOptionService service = (IDesignerOptionService)this.GetService(typeof(IDesignerOptionService)); </code></pre> <p>If you're working with a <a href="http://msdn.microsoft.com/en-us/library/system.componentmodel.component.aspx" rel="nofollow noreferrer">Component</a>, then you get access to this via the <a href="http://msdn.microsoft.com/en-us/library/system.componentmodel.component.site.aspx" rel="nofollow noreferrer">Site</a> property. It's quite common and practically required knowledge when creating custom controls.</p> <p>This is Service Location, textbook example. You've got a generic <code>IServiceProvider</code> that hands out abstract services you request by service type. If you ever want to create custom designers - smart tags and so on - then you need to know all of this. It's similar for ASP.NET as well.</p> <hr> <p><sub>P.S. Please don't <em>use</em> <code>IServiceProvider</code> in new code. It's a very old, non-generic interface. If you are creating reusable libraries that require an IoC container in order to work, you should use the <a href="http://commonservicelocator.codeplex.com/" rel="nofollow noreferrer">Common Service Locator</a> instead. But don't even use <em>that</em> unless you absolutely require that your library be agnostic of the DI library used at the application tier; most of the implementation-specific containers/kernels offer much richer APIs that you'll miss out on if you nail yourself to the CSL.</sub></p>

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