实现 BackgroundWorker + ProgressBar - C#

Question

我想为我的应用程序中的时间密集型任务引入一个 BackgroundWorker。 BackgroundWorker 应该在执行其中一项任务时更新我的​​状态条中的进度条。

一般实现没问题，只要时间密集型任务由我的表单类中的方法处理即可。

但我有一个如下所示的类：

public class JobFile
{
    public string FullName { get; private set; }
    public string FileName { get; private set; }
    public string Extension { get; private set; }
    public string Path { get; private set; }
    public Icon Icon { get; private set; }
    public DateTime Date { get; private set; }
    public long Size { get; private set; }
    public string MD5Hash { get; private set; }

    ...

    public string getMD5Hash()
    {
        // Time intensive operation occurring
    }
}

我想在我的 JobFile 对象中使用一个方法来执行计算，但我希望这个对象与我的 UI 异步通信，并更新它的进度条。

我怎样才能做到这一点？我是否需要在 JobFile 类中使用 BackgroundWorker？

这是我在异步事件中的第一步，我对自定义事件还不是很了解，所以请多多包涵！

谢谢你:)

Answer 1

请看：How to: Use a Background Worker

界面类

public class UI
{
    private JobFile JobFile { get; set; }
    public int ProgressPercentage { get; set; }


    public void getMD5Hash()
    {
        BackgroundWorker bw = new BackgroundWorker();
        bw.WorkerReportsProgress = true;
        bw.DoWork += JobFile.bw_DoWork;
        bw.ProgressChanged += bw_ProgressChanged;
        bw.RunWorkerCompleted += bw_RunWorkerCompleted;
        bw.RunWorkerAsync();
    }


    private void bw_ProgressChanged(object sender, ProgressChangedEventArgs e)
    {
        // This would have to run on dispatcher in order to update UI
        this.ProgressPercentage = e.ProgressPercentage;
    }

    private void bw_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
    {
        // If you need to do anything opn completion
    }
}

还有工作文件

public class JobFile
{
    public string FullName { get; private set; }
    public string FileName { get; private set; }
    public string Extension { get; private set; }
    public string Path { get; private set; }
    public DateTime Date { get; private set; }
    public long Size { get; private set; }
    public string MD5Hash { get; private set; }

    public void bw_DoWork(object sender, DoWorkEventArgs e)
    {
        BackgroundWorker worker = sender as BackgroundWorker;
        StringBuilder hash = new StringBuilder();
        for (int i = 1; (i <= 10); i++)
        {
            // Perform a time consuming operation and report progress.
            // Such as computing part of the hash.
            hash.Append(i);

            //Report progress here
            worker.ReportProgress((i * 10)); // 
        }

        MD5Hash = hash.ToString();
    }
}

虽然我强烈建议为此使用任务。