异步任务运行时如何更改进度条值 [英] How to change progressbar value when async task running

问题描述

我正在使用异步等待任务来运行此代码，并且我想在提取时更改进度条

i am using async await task to run this code and i want to change the progress bar when extracting

public async Task<string> DownloadAndExtractFile(string source, string destination, string ItemDownload) //source = File Location //destination = Restore Location
    {
        string zPath = @"C:Program Files7-Zip7zG.exe";
        ProcessStartInfo pro = new ProcessStartInfo();
        pro.WindowStyle = ProcessWindowStyle.Hidden;
        pro.FileName = zPath;
        pro.Arguments = "x "" + source + "" -o" + destination;

        await Task.Run(() =>
        {
            Restore.frmRestore.progressBar1.Value = 50; //already set to public
            try
            {
                Process x = Process.Start(pro);
                Task.WaitAll();
                Restore.frmRestore.progressBar1.Value = 100;//already set to public
                x.Close();
                Console.WriteLine("Extract Successful.");
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.ToString());
            }

        }
           );

        return "Success";
    }

如何在任务运行时更改进度条值.这是错误跨线程操作无效:控制'progressBar1'从创建它的线程以外的线程访问."

how to change the progressbar value when task running. this is the error "Cross-thread operation not valid: Control 'progressBar1' accessed from a thread other than the thread it was created on."

推荐答案

使用 Progress 类型报告进度，正如我在我的博客中所描述的:

Use the Progress<T> type to report progress, as I describe on my blog:

public async Task<string> DownloadAndExtractFile(string source, string destination, string ItemDownload)
{
  string zPath = @"C:Program Files7-Zip7zG.exe";
  ProcessStartInfo pro = new ProcessStartInfo();
  pro.WindowStyle = ProcessWindowStyle.Hidden;
  pro.FileName = zPath;
  pro.Arguments = "x "" + source + "" -o" + destination;

  IProgress<int> progress = new Progress<int>(
      value => { Restore.frmRestore.progressBar1.Value = value; });

  await Task.Run(() =>
  {
    progress.Report(50);
    try
    {
      Process x = Process.Start(pro);
      Task.WaitAll();
      progress.Report(100);
      x.Close();
      Console.WriteLine("Extract Successful.");
    }
    catch (Exception ex)
    {
      Console.WriteLine(ex.ToString());
    }
  });
  return "Success";
}

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