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PODependency Injection with MVVM and Child Windows
 

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    <p>I am using MVVM Light and I'm currently using SimpleIoC that comes with the package. I'm getting a bit stuck with the dependency injection. I have a bunch of services that I want to use in my view models, however most windows are a List-Edit paradigm, i.e. one screen lists all of type <code>Person</code> and then you can Add or Edit a <code>Person</code> via a new screen.</p> <p>When I was doing all code in the code behind my code for adding and editing a record was as follows:</p> <p><strong>View</strong></p> <pre><code>private void btnEdit_Click(object sender, RoutedEventArgs e) { _viewModel.Edit(); } private void btnAdd_Click(object sender, RoutedEventArgs e) { _viewModel.Add(); } </code></pre> <p><strong>View Model</strong></p> <pre><code>public void Add() { var f = new TypeDetails(); f.Show(); } public void Edit() { if (SelectedItem == null) return; var f = new TypeDetails(SelectedItem.Id); f.Show(); } </code></pre> <p>The constructor of <code>TypeDetails</code> is as follows:</p> <pre><code>public TypeDetails(int id = 0) { InitializeComponent(); _viewModel = new TypeDetailsViewModel(id); DataContext = _viewModel; } </code></pre> <p>What would the best be to implement this type functionality with MVVM Light? I have been using the <code>ViewModelLocator</code> class for the List screens, however I cannot see a way to do this using the SimpleIoC. My way round so far has been to keep the constructor the same, which works fine until I need to inject dependencies into the <code>TypeDetailsViewModel</code> such as a service. With a service the constructor of <code>TypeDetailsViewModel</code> would be:</p> <pre><code>public TypeDetailsViewModel(ISomeService someService, int id = 0) { ... } </code></pre> <p>But that means in my view constructor I have to build these dependencies one at a time and manually inject them...</p> <pre><code>public TypeDetails(int id = 0) { InitializeComponent(); _viewModel = new TypeDetailsViewModel(SimpleIoC.Current.GetInstance&lt;ISomeService&gt;(),id); DataContext = _viewModel; } </code></pre> <p>Is there a better way to do this? </p>
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