Question

构建一个接收视频文件（avi，mpeg ..）并转换为其他格式的应用程序。

我的应用程序有我添加文件的列表框，我添加了添加目录的选项，所以SafeFileEnumerator类（我在这里找到）我检查目录root并只收到有权限的文件夹，当然所有文件，而不是我想将所有相关文件添加到我的列表框中，但我想这样做，如果线程，以避免mt GUI冻结，所以我尝试使用BackgroundWorker，我想我需要一些帮助来完成它，因为在我的情况在这里它无法正常工作：

private void btnAddDirettory_Click_1(object sender, EventArgs e)
{
    string fileToAdd = string.Empty;
    BackgroundWorker backgroundWorker = null;
    DialogResult dialog = folderBrowserDialog1.ShowDialog();
    if (dialog == DialogResult.OK)
    {
        btnAddfiles.Enabled = false;
        btnAddDir.Enabled = false;
        btnPlay.Enabled = false;
        someClass myClass= new someClass ();

        foreach (string fileName in SafeFileEnumerator.EnumerateFiles(folderBrowserDialog1.SelectedPath, "*.*", SearchOption.AllDirectories))
        {
            backgroundWorker = new BackgroundWorker();
            backgroundWorker.WorkerReportsProgress = true;
            backgroundWorker.DoWork +=
            (s1, e1) =>
            {
                if (myClass.iAviFormat(fileName))
                {
                    if (myClass.isCorrectFormat(fileName))
                    {
                        backgroundWorker.ReportProgress(0, fileName);
                        //listBoxFiles.Items.Add(fileName);
                    }
                    else if (!myClass.isCorrectFormat(fileName))
                    {
                        fileToAdd = myClass.getNewFileName(fileName);
                        backgroundWorker.ReportProgress(0, fileToAdd);
                    }
                }
            };
        }

        backgroundWorker.RunWorkerCompleted += new RunWorkerCompletedEventHandler(
        (s1, e1) =>
        {
            btnPlay.Enabled = true;
            btnClear.Enabled = true;
            btnAddfiles.Enabled = true;
            btnAddDir.Enabled = true;
        });

        backgroundWorker.ProgressChanged +=
         (s1, arguments) =>
         {
             listBoxFiles.Items.Add(arguments.UserState);
         };

        backgroundWorker.RunWorkerAsync();
    }
}

Answer 1

我认为你应该将foreach移到后台工作者DoWork中。

像

这样的东西

backgroundWorker = new BackgroundWorker();
backgroundWorker.WorkerReportsProgress = true;
backgroundWorker.DoWork +=
(s1, e1) =>
{
    string fileToAdd = string.Empty;
    someClass myClass= new someClass ();

    foreach (string fileName in SafeFileEnumerator.EnumerateFiles(folderBrowserDialog1.SelectedPath, "*.*", SearchOption.AllDirectories))
    {
        if (myClass.iAviFormat(fileName))
        {
            if (myClass.isCorrectFormat(fileName))
            {
                backgroundWorker.ReportProgress(0, fileName);
                //listBoxFiles.Items.Add(fileName);
            }
            else if (!myClass.isCorrectFormat(fileName))
            {
                fileToAdd = myClass.getNewFileName(fileName);
                backgroundWorker.ReportProgress(0, fileToAdd);
            }
        }
    }
};

使用不同的线程将许多文件插入列表框

1 个答案: