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    <p>SimpleIoc crib sheet:</p> <p>1) You register all your interfaces and objects in the ViewModelLocator</p> <pre><code>class ViewModelLocator { static ViewModelLocator() { ServiceLocator.SetLocatorProvider(() =&gt; SimpleIoc.Default); if (ViewModelBase.IsInDesignModeStatic) { SimpleIoc.Default.Register&lt;IDataService, Design.DesignDataService&gt;(); } else { SimpleIoc.Default.Register&lt;IDataService, DataService&gt;(); } SimpleIoc.Default.Register&lt;MainViewModel&gt;(); SimpleIoc.Default.Register&lt;SecondViewModel&gt;(); } public MainViewModel Main { get { return ServiceLocator.Current.GetInstance&lt;MainViewModel&gt;(); } } } </code></pre> <p>2) Every object is a singleton by default. To resolve an object so that it's not a singleton you need to pass a unique value to the GetInstance call:</p> <pre><code>SimpleIoc.Default.GetInstance&lt;MainViewModel&gt;(Guid.NewGuid().ToString()); </code></pre> <p>3) To register a class against an interface:</p> <pre><code>SimpleIoc.Default.Register&lt;IDataService, Design.DesignDataService&gt;(); </code></pre> <p>4) To register a concrete object against an interface:</p> <pre><code>SimpleIoc.Default.Register&lt;IDataService&gt;(myObject); </code></pre> <p>5) To register a concrete type:</p> <pre><code>SimpleIoc.Default.Register&lt;MainViewModel&gt;(); </code></pre> <p>6) To resolve an object from an interface:</p> <pre><code>SimpleIoc.Default.GetInstance&lt;IDataService&gt;(); </code></pre> <p>7) To resolve an object directly (does buildup and dependency resolution):</p> <pre><code>SimpleIoc.Default.GetInstance&lt;MainViewModel&gt;(); </code></pre> <p>8) MVVM makes doing design-time data really easy:</p> <pre><code>if (ViewModelBase.IsInDesignModeStatic) { SimpleIoc.Default.Register&lt;IDataService, Design.DesignDataService&gt;(); } else { SimpleIoc.Default.Register&lt;IDataService, DataService&gt;(); } </code></pre> <p>If you're in design-time mode it will automatically register your design-time services, making it really easy to have data in your viewmodels and views when working in the VS designer.</p> <p>Hope this helps.</p>
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    1. CORe: 1) I found SimpleIoc throws design time exception because service is already registered. If I place check for IsRegistered, and then reference SimpleIoc in my view model then design time data won't show (no exception thrown, just doesn't show). If I remove SimpleIoc and manually create data then it shows up in design time. So, no I don't thinks it's "really easy" :) Note that data service works fine outside of design time.
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    2. COAhh...changing to static ctor in ViewModelLocator fixes "service already registered" exception.
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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

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