How do I get the text bound to txtMessage from the second view model? When I had only one view model, the text was working fine. It does not work anymore when I moved the actual download code to second view model. Am I missing something? Any help appreciated.
Xaml:
<DockPanel DockPanel.Dock="Top"> <TextBlock x:Name="txtMessage" DockPanel.Dock="Top" Margin="5" Text="{Binding viewModel1.Message}" /> <StackPanel DockPanel.Dock="Top" Orientation="Horizontal" Margin="5,5"> <ProgressBar Width="300" Visibility="{Binding IsDownloading, Converter={converter:VisibilityConverter}}" IsIndeterminate="True" /> <Button Content="Cancel" /> </StackPanel> </DockPanel> <Button Content="Download" Width="120" Margin="0,0,5,0" Name="btnSubmit" Click="btnSubmit_Click" /> CodeBehind:
public partial class DownloadWindow: Window { DownloadWindowViewModel viewModel = new DownloadWindowViewModel(); public DownloadWindow() { InitializeComponent(); this.DataContext = viewModel; } private void btnSubmit_Click(object sender, RoutedEventArgs e) { viewModel.IsDownloading = true; viewModel.Download(); } } viewModel:
public class DownloadWindowViewModel: INotifyPropertyChanged { Thread downloadThread; public DownloadViewModel viewModel1; public DownloadWindowViewModel() { viewModel1 = new DownloadViewModel(); } private bool _isDownloading; = false; public bool IsDownloading { get { return _isDownloading; } set { _isDownloading; = value; OnPropertyChanged("IsDownloading"); } } public void Download() { viewModel1.Download(); } public event PropertyChangedEventHandler PropertyChanged; public void OnPropertyChanged(string propertyName) { PropertyChangedEventHandler handler = PropertyChanged; if (handler != null) { handler(this, new PropertyChangedEventArgs(propertyName)); } } } viewModel1:
public class DownloadViewModel: INotifyPropertyChanged { Thread _thread; public void Download() { ThreadStart threadStart = delegate() { StartDownload(); }; _thread = new Thread(threadStart); _thread.IsBackground = true; _thread.Start(); } private void StartDownload() { for (int i = 10; i < 1500; i++) { Thread.Sleep(5000); Message = "Downloading " + i.ToString(); } } private string _message = ""; public string Message { get { return _message; } set { if (_message != value) { _message = value; OnPropertyChanged("Message"); } } } public event PropertyChangedEventHandler PropertyChanged; protected void OnPropertyChanged(string propertyName) { PropertyChangedEventHandler handler = PropertyChanged; if (handler != null) { handler(this, new PropertyChangedEventArgs(propertyName)); } } } 
