在另一个 class 内增加 ProgressBar

Question

这是我在这里问的第一个问题，所以请多多关照 ;)

所以我目前正在编写的 C# 应用程序中实际上有两个 WinForms（我对 C# 很陌生）。

这个window有一个按钮，可以将您之前在列表框中选择的USB设备中的照片保存到另一个文件夹中。单击此按钮后，我的主线程当然忙于复制，因此我决定创建另一个包含 ProgressBar 的 WinForm。

对于每个完成的副本，我想相应地增加 ProgressBar。

所以我计算了我必须做的份数，并将进度条设置为最大值。但我现在的问题是，我真的不知道如何在不出现线程不安全异常的情况下增加 ProgressBar。

这是我的 ProgressWindow 代码：

public partial class ProgressWindow : Form
{
    BackgroundWorker updateProgressBarThread = new BackgroundWorker();

    private Boolean _isThreadRunning = false;
    public Boolean IsThreadRunning
    {
        get { return _isThreadRunning; }
        set { _isThreadRunning = value; }
    }

    private int _progressbarLength;
    public int ProgressbarLength
    {
        get { return _progressbarLength; }
        set { _progressbarLength = value; }
    }

    private int progress = 1;

    public ProgressWindow()
    {
        Show();
        InitializeComponent();
    }

    private void StartUpdateThread(object sender, DoWorkEventArgs e)
    {
        BackgroundWorker worker = sender as BackgroundWorker;

        // Reports progress to the ProgressChangedEvent function. (Thread Safe)

    }

    private void FinishProgressThread(object sender, RunWorkerCompletedEventArgs e)
    {
        if (!_isThreadRunning)
        {
            MessageBox.Show("Erfolgreich kopiert");
            Close();
        }

    }

    private void ProgressChangedEvent(object sender, ProgressChangedEventArgs e)
    {
        this.copyProgressbar.Value = e.ProgressPercentage;
        this.progressStatus.Text = e.ProgressPercentage.ToString();
    }

    public void CallUpdateThread()
    {
        updateProgressBarThread.WorkerReportsProgress = true;

        updateProgressBarThread.DoWork += new DoWorkEventHandler(StartUpdateThread);
        updateProgressBarThread.ProgressChanged += new ProgressChangedEventHandler(ProgressChangedEvent);
        updateProgressBarThread.RunWorkerCompleted += new RunWorkerCompletedEventHandler(FinishProgressThread);
        updateProgressBarThread.RunWorkerAsync();
    }

}

我想在每次成功复制后将 ProgressBar 增加 1。我如何从我的主线程执行此操作？

这是实际处理复制过程的函数

private void SaveFile(System.IO.DirectoryInfo root)
{
    try
    {
        IEnumerable<DirectoryInfo> directoriesNames = root.EnumerateDirectories();

        // New instance of thread ProgressWindow.
        ProgressWindow progress = new ProgressWindow();
        progress.CallUpdateThread();

        foreach (DirectoryInfo element in directoriesNames)
        {
            // Query all subdirectories and count everything with the in the configuration made settings.
            if (!element.Attributes.ToString().Contains("System"))
            {
                // Now we insert the configuration we applied.
                String fileExtension = null;

                if (Properties.Settings.Default._configPhoto)
                {
                    fileExtension = "*.jpg";
                }

                if (Properties.Settings.Default._configWordDocument)
                {
                    fileExtension = "*.odt";
                }

                FileInfo[] jpgList = element.GetFiles(fileExtension, SearchOption.AllDirectories);

                // set the size of the progress bar
                progress.ProgressbarLength = jpgList.Count();

                // Now we go through all our results and save them to our backup folder.
                foreach (FileInfo tmp in jpgList)
                {
                    string sourceFilePath = tmp.FullName;
                    string destFilePath = PATHTOBACKUP + "\" + tmp.Name;
                    progress.IsThreadRunning = true;

                    try
                    {                                
                        System.IO.File.Copy(sourceFilePath, destFilePath, true);
                    }
                    catch (IOException ioe)
                    {
                        MessageBox.Show(ioe.Message);
                    }
                }
            }
        }
        // progress.IsThreadRunning = false;
    }
    catch (UnauthorizedAccessException e)
    {
        MessageBox.Show(e.Message);
    }
}

很明显我必须在这个函数之后做这个

System.IO.File.Copy(sourceFilePath, destFilePath, true);

但是我该如何将此报告给我的 ProgressWindow？

我真的希望我解释得足够好，不确定我是否遗漏了一些重要的东西。

提前谢谢大家

Answer 1

以下是关键组件的紧凑示例：

点击按钮启动新的线程工作者
进度取决于文件长度，而不是文件数量

用于更新进度条的BeginInvoke（避免跨线程异常）

    ProgressBar pb = new ProgressBar() { Minimum = 0, Maximum = 100 };
    Button btn = new Button();
    btn.Click += delegate {
        Thread t = new Thread(() => {
            DirectoryInfo dir = new DirectoryInfo("C:\temp\");
            var files = dir.GetFiles("*.txt");
            long totalLength = files.Sum(f => f.Length);
            long length = 0;
            foreach (var f in files) {
                length += f.Length;
                int percent = (int) Math.Round(100.0 * length / totalLength);
                pb.BeginInvoke((Action) delegate {
                    pb.Value = percent;
                });

                File.Copy(f.FullName, "...");
            }
        });
        t.IsBackground = true;
        t.Start();
    };

在另一个 class 内增加 ProgressBar

Increment ProgressBar within another class

c#

multithreading

backgroundworker

winforms