通常，您的UI会简单地绑定到VM中的属性：
<ProgressBar Value="{Binding CurrentProgress, Mode=OneWay}" Visibility="{Binding ProgressVisibility}"/>您的VM将使用a
BackgroundWorker在后台线程上进行工作，并定期更新该
CurrentProgress值。像这样：
public class MyViewModel : ViewModel{ private readonly BackgroundWorker worker; private readonly ICommand instigateWorkCommand; private int currentProgress; public MyViewModel() { this.instigateWorkCommand = new DelegateCommand(o => this.worker.RunWorkerAsync(), o => !this.worker.IsBusy); this.worker = new BackgroundWorker(); this.worker.DoWork += this.DoWork; this.worker.ProgressChanged += this.ProgressChanged; } // your UI binds to this command in order to kick off the work public ICommand InstigateWorkCommand { get { return this.instigateWorkCommand; } } public int CurrentProgress { get { return this.currentProgress; } private set { if (this.currentProgress != value) { this.currentProgress = value; this.onPropertyChanged(() => this.CurrentProgress); } } } private void DoWork(object sender, DoWorkEventArgs e) { // do time-consuming work here, calling ReportProgress as and when you can } private void ProgressChanged(object sender, ProgressChangedEventArgs e) { this.CurrentProgress = e.ProgressPercentage; }}
