Silverlight MVVM模式中的子窗口

Question

我想从Silverlight（3）中使用MVVM模式从ChildWindow/popup中获取数据的正确方法。例如：我有一个带有数据输入表单的主页面，我想打开一个带有客户列表的弹出窗口。当用户选择一个客户时，我想将选定的客户转移到主页面。这是我使用的时刻将（例如）代码：

主页

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; 
    } 
} 

这是正确的方式还是有什么更“简单”？

干杯， 韩城

Answer 1

更大的问题这里采用的是在VM中查看具体条款和类型。 Click事件，DialogResults不应该在您的ViewModels附近。

至于这个问题，我对这个在这里一个类似的问题： Handling Dialogs in WPF with MVVM

我接受的答案是使用调解模式来解决这个问题。看一看。 :)

Answer 2

一个很好的支持打开子窗口的MVVM库是Chinch mvvm帮手库。您可以在http://www.codeproject.com/KB/silverlight/SL4FileUploadAnd_SL4_MVVM.aspx查看样本。