Question

我正在创建使用DotNetZip备份我的应用程序数据的选项，并且为了避免冻结应用程序，我发现这种类型的操作最好的方法是使用BackgroundWorker。所以我带来了类似的东西：

    private void processButton_Click(object sender, EventArgs e)
    {
        BackgroundWorker worker = new BackgroundWorker();
        worker.WorkerReportsProgress = true;
        worker.DoWork += new DoWorkEventHandler(worker_DoWork);
        worker.ProgressChanged += new ProgressChangedEventHandler(worker_ProgressChanged);
        worker.RunWorkerCompleted += new RunWorkerCompletedEventHandler(worker_RunWorkerCompleted);

        BackupParams bp = new BackupParams();
        bp.Source = inputTextBox.Text;  // source dir
        bp.Output = outputTextBox.Text; // output file
        bp.Password = @"Pa$$w0rd";

        worker.RunWorkerAsync(bp);
    }

    void worker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
    {
        MessageBox.Show((string)e.Result, "Zip", MessageBoxButtons.OK, MessageBoxIcon.Information);
    }

    void worker_ProgressChanged(object sender, ProgressChangedEventArgs e)
    {

    }

    void worker_DoWork(object sender, DoWorkEventArgs e)
    {
        BackupParams bp = (BackupParams)e.Argument;

        string id = Guid.NewGuid().ToString();
        comment += "Created at: " + DateTime.Now.ToString() + "\n";
        comment += id;

        ZipFile zf = new ZipFile();
        zf.Comment = comment;
        zf.CompressionMethod = CompressionMethod.BZip2;
        zf.CompressionLevel = CompressionLevel.BestCompression;

        zf.Encryption = EncryptionAlgorithm.WinZipAes256;
        zf.Password = bp.Password;

        zf.Name = bp.Output;

        zf.AddDirectory(bp.Source);

        zf.Save();

        e.Result = bp.Output;
    }

这是BackupParams

public class BackupParams
{
    public string Source { get; set; }
    public string Output { get; set; }
    public string Password { get; set; }
}

现在我卡住了，因为我想显示添加到存档中的文件的进度（名称百分比）。做这个的最好方式是什么？我知道我可以使用ZipFile中的那些方法

zf.SaveProgress += zf_SaveProgress;
zf.AddProgress += zf_AddProgress;

但是那些我没有访问进度条或表格上的标签......

Answer 1

要从BackgroundWorker发送进度报告，请在ReportProgress()方法中使用DoWork。

void worker_DoWork(object sender, DoWorkEventArgs e)
{
    BackgroundWorker theWorker = (BackgroundWorker)sender;
    theWorker.ReportProgress(0, "just starting");

    BackupParams bp = (BackupParams)e.Argument;
    ...

然后会触发您的worker_ProgressChanged方法，这样您就可以将报告从那里带到控件中。

诀窍是你必须使用另一个函数来处理zip创建时的进度变化。您无法在此处访问UI控件，因为它们位于不同的线程上。你应该能够为此创建一个lambda（我不知道确切的参数，如果我错了请修复）

zf.SaveProgress += (sender, eventArgs) => 
{
    // Check if EvenType equals Saving_AfterWriteEntry or NullReferenceException will be thrown
    if (eventArgs.EventType == ProgressEventType.Saving_AfterWriteEntry)
    {
        theWorker.ReportProgress(eventArgs.EntriesSaved, "Saving "+ eventArgs.CurrentEntry.FileName);
    }
};

zf.AddProgress += (sender, eventArgs) => 
{
    // Check if EventType equals Adding_afterAddEntry or NullReferenceException will be thrown
    if (eventArgs.EventType == ZipProgressEventType.Adding_afterAddEntry)
    {
        theWorker.ReportProgress(eventArgs.EntriesAdded, "Adding "+ eventArgs.CurrentEntry.FileName);
    }
};

BackgroundWorker中的DotNetZip更新表单上的进度条和标签

1 个答案: