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我正在使用SafeFileEnumerator类来搜索文件夹根目录中的文件，该类仅从具有权限的位置返回文件，因此我成功使用了它。

当我尝试以这种方式填写我的列表时，一切正常：

 List<string> list = new List<string>();
                    list = SafeFileEnumerator.EnumerateFiles(folderBrowserDialog1.SelectedPath,
                        "*.*", SearchOption.AllDirectories).ToList();

但在这种情况下，我的 GUI 冻结了，所以我将它移动到新线程，在这种情况下什么也没有发生，我想知道为什么：

private void btnAddDir_Click(object sender, EventArgs e)
{
    List<string> list = new List<string>();
    string fileToAdd = string.Empty;
    List<string> filesList = new List<string>();
    dialog = folderBrowserDialog1.ShowDialog();
    tbAddDir.Text = folderBrowserDialog1.SelectedPath;
    string pathToSearch = folderBrowserDialog1.SelectedPath;
    if (dialog == DialogResult.OK)
    {
        toolStripStatusLabel.Text = "Search for pcap files...";
        groupBoxRootDirectory.Enabled = false;
        btnStart.Enabled = false;                

        ThreadStart starter = delegate
        {
            list = SafeFileEnumerator.EnumerateFiles(pathToSearch, "*.pcap", SearchOption.AllDirectories).ToList();
        };

        Thread t = new Thread(starter);
        t.IsBackground = true;
        t.Start();

        if(list.Count != 0)
            AddFilesToListBox(list);
    }
}

SafeFileEnumerator 类代码：

public static class SafeFileEnumerator
{
    public static IEnumerable<string> EnumerateDirectories(string parentDirectory, string searchPattern, SearchOption searchOpt)
    {
        try
        {
            var directories = Enumerable.Empty<string>();
            if (searchOpt == SearchOption.AllDirectories)
            {
                directories = Directory.EnumerateDirectories(parentDirectory).SelectMany(x => EnumerateDirectories(x, searchPattern, searchOpt));
            }
            return directories.Concat(Directory.EnumerateDirectories(parentDirectory, searchPattern));
        }
        catch (UnauthorizedAccessException ex)
        {
            return Enumerable.Empty<string>();
        }
    }

    public static IEnumerable<string> EnumerateFiles(string path, string searchPattern, SearchOption searchOpt)
    {
        try
        {
            var dirFiles = Enumerable.Empty<string>();
            if (searchOpt == SearchOption.AllDirectories)
            {
                dirFiles = Directory.EnumerateDirectories(path).SelectMany(x => EnumerateFiles(x, searchPattern, searchOpt));
            }

            return dirFiles.Concat(Directory.EnumerateFiles(path, searchPattern));
        }
        catch (UnauthorizedAccessException ex)
        {
            return Enumerable.Empty<string>();
        }
    }
}

在我的列表充满文件之后：

private void AddFilesToListBox(List<string> filesList)
{
    string fileToAdd = string.Empty;
    Editcap editcap = new Editcap();
    Capinfos capinfos = new Capinfos();
    BackgroundWorker backgroundWorker = new BackgroundWorker();
    backgroundWorker.WorkerReportsProgress = true;
    backgroundWorker.DoWork +=
        (s1, e1) =>
        {
            foreach (string fileName in filesList)
            {
                FileInfo fileInfo = new FileInfo(fileName);
                if (checkFileCreationDate(fileInfo))
                {
                    if (editcap.isWiresharkFormat(fileInfo.FullName))
                    {
                        if (editcap.isLibpcapFormat(fileInfo.FullName))
                        {
                            addFileToListBox(fileInfo.FullName, capinfos.getFileDuration(fileInfo.FullName));
                        }
                        else if (!editcap.isLibpcapFormat(fileInfo.FullName))
                        {
                            fileToAdd = editcap.getNewFileName(fileInfo.FullName);

                            if (new FileInfo(fileToAdd).Exists && !fileInfo.Exists)
                            {
                                addFileToListBox(fileToAdd, capinfos.getFileDuration(fileInfo.FullName));
                            }
                        }
                    }
                }

                //this.Invoke((MethodInvoker)delegate { lvFiles.Items[lvFiles.Items.Count - 1].Selected = true; });
                toolStripStatusLabel.Text = string.Format("{0} files were added", lvFiles.Items.Count);
            }

            //this.Invoke((MethodInvoker)delegate { lvFiles.Items[lvFiles.Items.Count - 1].Selected = true; });
        };

    backgroundWorker.RunWorkerCompleted += new RunWorkerCompletedEventHandler(
    (s1, e1) =>
    {
        groupBoxRootDirectory.Enabled = true;
        btnClear.Enabled = true;
        if (lvFiles.Items.Count != 0)
            btnStart.Enabled = true;
        toolStripStatusLabel.Text = string.Format("{0} files were added", lvFiles.Items.Count);

        if (tbAddDir.Text != "")
        {
            listener = new FileListener();
            listener.startListener(tbAddDir.Text);
            listener._newFileEventHandler += listener_newFileEventHandler;
        }
    });

    backgroundWorker.RunWorkerAsync();
}
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1 回答 1

2

在 t.start() 之后我调用 AddFilesToListBox(list);

您没有实现异步模式。

在t.Start();被调用之后，线程还没有完成它的工作，所以在你调用的时候你的列表仍然是空的AddFilesToListBox。实现异步模式并AddFilesToListBox在线程完成工作后调用。

于 2013-01-02T13:04:20.950 回答