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POSilverlight child windows in MVVM pattern
 

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    <p>I am trying to find the right way to get the data from a ChildWindow/popup using a MVVM pattern in Silverlight (3). For example: I have a main page with a data entry form and I want to open a popup with a list of customers. When user selects a customer I want to transfer selected customer into the main page. This is what the (example) code which I am using at the moment:</p> <p><strong>Main page</strong></p> <pre><code>public partial class MainPage : UserControl { public MainPageViewModel ViewModel { get; private set; } public MainPage() { InitializeComponent(); ViewModel = new MainPageViewModel(); DataContext = ViewModel; } private void SearchCustomer_Click(object sender, RoutedEventArgs e) { ViewModel.SearchCustomer(); } } public class MainPageViewModel: ViewModel { private string customer; public string Customer { get { return customer; } set { customer = value; RaisePropertyChanged("Customer"); } } public void SearchCustomer() { // Called from a view SearchWindow searchWindow = new SearchWindow(); searchWindow.Closed += (sender, e) =&gt; { if ((bool)searchWindow.DialogResult) { Customer = searchWindow.ViewModel.SelectedCustomer.ToString(); } }; searchWindow.Show(); } } </code></pre> <p><strong>Child window</strong></p> <pre><code>public partial class SearchWindow : ChildWindow { public SearchWindowViewModel ViewModel { get; private set; } public SearchWindow() { InitializeComponent(); ViewModel = new SearchWindowViewModel(); DataContext = ViewModel; } private void OKButton_Click(object sender, RoutedEventArgs e) { DialogResult = ViewModel.OkButtonClick(); } private void CancelButton_Click(object sender, RoutedEventArgs e) { DialogResult = ViewModel.CancelButtonClick(); } } public class SearchWindowViewModel: ViewModel { private Customer selectedCustomer; private ObservableCollection&lt;Customer&gt; customers; public ObservableCollection&lt;Customer&gt; Customers { get { return customers; } set {customers = value; RaisePropertyChanged("Customers"); } } public Customer SelectedCustomer { get { return selectedCustomer; } set { selectedCustomer = value; RaisePropertyChanged("SelectedCustomer"); } } public SearchWindowViewModel() { Customers = new ObservableCollection&lt;Customer&gt;(); ISearchService searchService = new FakeSearchService(); foreach (Customer customer in searchService.FindCustomers("dummy")) Customers.Add(customer); } public bool? OkButtonClick() { if (SelectedCustomer != null) return true; else return null; // show some error message before that } public bool? CancelButtonClick() { return false; } } </code></pre> <p>Is this the right way or is there anything more "simple"?</p> <p>Cheers, Rok</p>
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