关于c#：WPF ProgressBar-在操作完成后使进度条完成


WPF ProgressBar - make the progress bar completed after the operation finished

我有一个WPF表单，该表单运行带有进度条的后台操作。但问题是；

操作完成后，进度条仍在运行。我的意思是，它表明操作正在进行中。

我该如何阻止呢？这是我的全部代码；

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System.ComponentModel.BackgroundWorker mWorker;

private void button1_Click(object sender, RoutedEventArgs e) {

    mWorker = new System.ComponentModel.BackgroundWorker();
    mWorker.DoWork +=new System.ComponentModel.DoWorkEventHandler(worker_DoWork);
    mWorker.ProgressChanged +=new System.ComponentModel.ProgressChangedEventHandler(worker_ProgressChanged);
    mWorker.WorkerReportsProgress = true;
    mWorker.WorkerSupportsCancellation = true;
    mWorker.RunWorkerCompleted += new System.ComponentModel.RunWorkerCompletedEventHandler(worker_RunWorkerCompleted);
    mWorker.RunWorkerAsync();

    while (pbProcessing.Value != 100) {

        if (!mWorker.CancellationPending) {

            try {

                pbProcessing.Value = (pbProcessing.Value + 0.01) % 100;

            } catch (System.Exception ex) {

                // No action required
            }

        } else {

            MessageBox.Show(this,"Process cancelled","Cancel Process", MessageBoxButton.OK);
            break;

        }

        System.Windows.Threading.Dispatcher.CurrentDispatcher.Invoke(System.Windows.Threading.DispatcherPriority.Background,
               new System.Threading.ThreadStart(delegate { }));

    }

}

private void worker_DoWork(object sender, System.ComponentModel.DoWorkEventArgs e) {

    // Do your work here, its on seperate thread
    System.Threading.Thread.Sleep(10000);

}
private void worker_ProgressChanged(object sender, System.ComponentModel.ProgressChangedEventArgs e) {

    pbProcessing.Value = e.ProgressPercentage;

}
private void worker_RunWorkerCompleted(object sender, System.ComponentModel.RunWorkerCompletedEventArgs e) {

    // Stop Progressbar updatation  
    Window1 w = new Window1();
    w.Browser.Navigate(new Uri("http://stackoverflow.com"));
    w.Show();

}

private void Window_Closing(object sender, System.ComponentModel.CancelEventArgs e) {

    if (mWorker != null) {

        if (mWorker.IsBusy) {
            mWorker.CancelAsync();
        }

    }

}
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如果要在完成工作后隐藏进度条，请将其Visibility属性设置为Visibility.Hidden。如果只想将其重置为初始状态，请将其Value设置为0(如果将其默认值更改为pbProgressing.Minimum，则设置为pbProgressing.Minimum)。

请注意，您的代码实际上没有任何意义：而不是在按钮事件处理程序中连续更改pbProcessing.Value(这完全没用，因为在完成按钮事件处理程序之前不会执行UI更新) ，您只应更改ProgressChanged中的值。即，您的代码应如下所示：

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System.ComponentModel.BackgroundWorker mWorker;

private void button1_Click(object sender, RoutedEventArgs e) {

    mWorker = new System.ComponentModel.BackgroundWorker();
    mWorker.DoWork +=new System.ComponentModel.DoWorkEventHandler(worker_DoWork);
    mWorker.ProgressChanged +=new System.ComponentModel.ProgressChangedEventHandler(worker_ProgressChanged);
    mWorker.WorkerReportsProgress = true;
    mWorker.WorkerSupportsCancellation = true;
    mWorker.RunWorkerCompleted += new System.ComponentModel.RunWorkerCompletedEventHandler(worker_RunWorkerCompleted);
    mWorker.RunWorkerAsync();

    // Don't do anything else here

}

private void worker_DoWork(object sender, System.ComponentModel.DoWorkEventArgs e) {
    for (int i = 1; i < 100; i++) {
        mWorker.ReportProgress(i);

        // Do some part of the work
        System.Threading.Thread.Sleep(100);

        // Check if the user wants to abort
        if (mWorker.CancellationPending) {
            e.Cancel = true;
            return;
        }
    }

    mWorker.ReportProgress(100);  // Done
}

private void worker_ProgressChanged(object sender, System.ComponentModel.ProgressChangedEventArgs e) {
    pbProcessing.Value = e.ProgressPercentage;
}

private void worker_RunWorkerCompleted(object sender, System.ComponentModel.RunWorkerCompletedEventArgs e) {

    // Stop Progressbar updatation  
    Window1 w = new Window1();
    w.Browser.Navigate(new Uri("http://stackoverflow.com"));
    w.Show();

    // Check the result
    if (e.Cancelled) {
        // show the message box that the task has been canceled
    }

    // Reset Progress bar
    pbProcessing.Value = 0;
}

private void Window_Closing(object sender, System.ComponentModel.CancelEventArgs e) {
    if (mWorker != null) {
        if (mWorker.IsBusy) {
            mWorker.CancelAsync();
        }
    }
}

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