La mise en œuvre de la barre de Progression de l'utilisation de WPF avec le pattern MVVM (à l'Aide de BackgroundWorker)

Remarque: Ce code fonctionne maintenant. J'ai corrigé une erreur stupide et j'ai aussi révisé de code que Steve Greatrex souligné.

Message Original LINK Comment mettre en place une barre de progression avec le pattern MVVM

ProgressbarSampleView.xaml

  <UserControl x:Class="MyProject.ProgressbarSampleView"
               xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
               xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
               Height="718" Width="1024">

  <ProgressBar Grid.Row="1" 
                 Value="{Binding CurrentProgress, Mode=OneWay}" 
                 Visibility="{Binding ProgressVisibility}" 
                 Margin="22,0,25,0" />

  <Button   Grid.Row="2"
            Content="Start Now"  
            Height="30" 
            Width="80" 
            HorizontalAlignment="Left" 
            Margin="22,4,0,0" 
            Name="btnStartNow" 
            VerticalAlignment="Top" 
            Command="{Binding Path=InstigateWorkCommand}" 
            />
  </UserControl>

ProggressbarSampleViewModel.cs

  namespace MyProject
{
public class ProggressbarSampleViewModel: ViewModelBase
{
private readonly BackgroundWorker worker; 
private readonly ICommand instigateWorkCommand;
public ProggressbarSampleViewModel()
{
this.instigateWorkCommand = new 
RelayCommand(o => this.worker.RunWorkerAsync(), o => !this.worker.IsBusy);
this.worker = new BackgroundWorker();
this.worker.DoWork += this.DoWork;
this.worker.ProgressChanged += this.ProgressChanged;
}
public ICommand InstigateWorkCommand
{
get { return this.instigateWorkCommand; }
}
private int _currentProgress;
public int CurrentProgress
{
get { return this._currentProgress; }
private set
{
if (this._currentProgress != value)
{
this._currentProgress = value;
OnPropertyChanged("CurrentProgress"); 
}
}
}
private void ProgressChanged(object sender, ProgressChangedEventArgs e)
{
this.CurrentProgress = e.ProgressPercentage;
}
private void DoWork(object sender, DoWorkEventArgs e)
{
//do time-consuming work here, calling ReportProgress as and when you can   
for (int i = 0; i < 100; i++)
{
Thread.Sleep(1000);
_currentProgress = i;
OnPropertyChanged("CurrentProgress");
}
}
}

OriginalL'auteur Shai | 2011-10-06