Silverlight MVVM模式中的子窗口

Question

我想從Silverlight（3）中使用MVVM模式從ChildWindow/popup中獲取數據的正確方法。例如：我有一個帶有數據輸入表單的主頁面，我想打開一個帶有客戶列表的彈出窗口。當用戶選擇一個客戶時，我想將選定的客戶轉移到主頁面。這是我使用的時刻將（例如）代碼：

主頁

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) => 
     { 
      if ((bool)searchWindow.DialogResult) 
      { 
       Customer = searchWindow.ViewModel.SelectedCustomer.ToString(); 
      } 
     }; 
     searchWindow.Show(); 
    } 
} 

子窗口

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<Customer> customers; 

    public ObservableCollection<Customer> 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<Customer>(); 
     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; 
    } 
} 

這是正確的方式還是有什麼更「簡單」？

乾杯， 韓城

Answer 1

更大的問題這裏採用的是在VM中查看具體條款和類型。 Click事件，DialogResults不應該在您的ViewModels附近。

至於這個問題，我對這個在這裏一個類似的問題： Handling Dialogs in WPF with MVVM

我接受的答案是使用調解模式來解決這個問題。看一看。 :)

Answer 2

一個很好的支持打開子窗口的MVVM庫是Chinch mvvm幫手庫。您可以在http://www.codeproject.com/KB/silverlight/SL4FileUploadAnd_SL4_MVVM.aspx查看樣本。