0
我想通过操作不透明度值将我的GUI上的Control设置为透明。 因此,我初始化我的WPF的形式像构造一个BackgroundWorker
:使用BackgroundWorker调用WPF-GUI更改时的异常
volumeWorker = new BackgroundWorker();
volumeWorker.DoWork += new DoWorkEventHandler(VolumeBarDoWork);
volumeWorker.ProgressChanged += new ProgressChangedEventHandler(VolumeBarChanged);
volumeWorker.RunWorkerCompleted += new RunWorkerCompletedEventHandler(VolumeBarCompleted);
volumeWorker.WorkerReportsProgress = true;
在那之后,我的GUI等待一个事件,它是由另一个类
soundController = new SoundController();
soundController.VolumeChanged +=new SoundController.VolumeChangedEventHandler(VolumeChanged);
触发事件处理我终于将启动volumeWorker(BGW)来操纵GUI:
private void VolumeChanged(float pVolume)
{
Logger.InfoWrite("Event raised ## New volume : {0}", pVolume);
volumeWorker.RunWorkerAsync();
}
但在BackgroundWorkers的ChangeEvent,我得到了InvalidOperatio每次都有nException。每个人都有想法?
private void VolumeBarDoWork(object sender, DoWorkEventArgs e)
{
BackgroundWorker worker = sender as BackgroundWorker;
Logger.InfoWrite("Worker");
for(int _opacity = 99 ; _opacity >= 0 ; _opacity--)
{
Logger.InfoWrite("Start on {0}", _opacity);
worker.ReportProgress(_opacity);
System.Threading.Thread.Sleep(20)
}
e.Result = e.Argument;
}
private void VolumeBarChanged(object sender, ProgressChangedEventArgs e)
{
this.volumeBar.Opacity -= 0.01f;
Logger.InfoWrite("Changed opacity to : {0} on {1}", this.volumeBar.Opacity, e.ProgressPercentage);
}
private void VolumeBarCompleted(object sender, RunWorkerCompletedEventArgs e)
{
Logger.InfoWrite("Completed");
this.volumeBar.Opacity = 0.0f;
}
感谢您的帮助,它的工作原理:-) – Kooki 2012-05-22 13:18:25