WPF ProgressBar - TargetParameterCountException

Answer 1

上传程序（或任何异步组件）可以与创建它的线程同步。可能有多种方法可以做到这一点，但我之前见过的方法是这样的：

public class ResumableUploader {
  private SynchronizationContext _syncContext;
  public event EventHandler<ProgressChangedEventArgs> OnProgressChanged;

  public ResumableUploader() {
    _syncContext = SynchronizationContext.Current; //Think of this as the current thread
  }

  private ReportProgressChanged(int progress) {
     if(OnProgressChanged != null) {
         _syncContext.Send(s => { OnProgressChanged(this, new ProgressChangedEventArgs(progress)); }, null);  //s is any data you want to pass in, here it is unused
     }
  }
}

或者，如果用户/客户端在创建实例时提供了SynchronizationContext，则用户/客户端稍微更灵活但也更复杂：

public ResumableUploader(SynchronizationContext syncContext)