使用WinForms ProgressBar进行异步/等待

我过去用BackgroundWorker处理过这种类型的事情，但我想使用.NET 4.5的新异步/等待方法。我可能找错树了。请告知。

目标：创建一个将执行一些长期运行的工作的组件，并在执行工作时显示带有进度条的模式窗体。该组件将获得一个窗口的句柄，以在执行长时间运行的工作时阻止交互。

状态：请参阅下面的代码。我以为我做得很好，直到我试着与窗户互动。如果我把事情放在一边（即不要碰！），一切都会"完美地"运行，但如果我在任何一个窗口上点击了太多，那么在长时间运行的工作结束后，程序就会挂起。实际交互（拖动）被忽略，就好像UI线程被阻止一样。

问题：我的代码可以很容易地修复吗？如果是，如何？或者，我应该使用不同的方法（例如BackgroundWorker）吗？

代码（Form1是一个标准表单，带有ProgressBar和一个公共方法UpdateProgress，用于设置ProgressBar的值）：

using System;
using System.Diagnostics;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace ConsoleApplication1
{
class Program
{
    static void Main(string[] args)
    {
        Console.WriteLine("Starting..");
        var mgr = new Manager();
        mgr.GoAsync();
        Console.WriteLine("..Ended");
        Console.ReadKey();
    }
}
class Manager
{
    private static Form1 _progressForm;
    public async void GoAsync()
    {
        var owner = new Win32Window(Process.GetCurrentProcess().MainWindowHandle);
        _progressForm = new Form1();
        _progressForm.Show(owner);
        await Go();
        _progressForm.Hide();
    }
    private async Task<bool> Go()
    {
        var job = new LongJob();
        job.OnProgress += job_OnProgress;
        job.Spin();
        return true;
    }
    void job_OnProgress(int percent)
    {
        _progressForm.UpdateProgress(percent);
    }
}
class LongJob
{
    public event Progressed OnProgress;
    public delegate void Progressed(int percent);
    public void Spin()
    {
        for (var i = 1; i <= 100; i++)
        {
            Thread.Sleep(25);
            if (OnProgress != null)
            {
                OnProgress(i);
            }
        }
    }
}
class Win32Window : IWin32Window
{
    private readonly IntPtr _hwnd;
    public Win32Window(IntPtr handle)
    {
        _hwnd = handle;
    }
    public IntPtr Handle
    {
        get
        {
            return _hwnd;
        }
    }
}
}

class Manager
{
  private static Form1 _progressForm;
  public async Task GoAsync()
  {
    var owner = new Win32Window(Process.GetCurrentProcess().MainWindowHandle);
    _progressForm = new Form1();
    _progressForm.Show(owner);
    var progress = new Progress<int>(value => _progressForm.UpdateProgress(value));
    await Go(progress);
    _progressForm.Hide();
  }
  private Task<bool> Go(IProgress<int> progress)
  {
    return Task.Run(() =>
    {
      var job = new LongJob();
      job.Spin(progress);
      return true;
    });
  }
}
class LongJob
{
  public void Spin(IProgress<int> progress)
  {
    for (var i = 1; i <= 100; i++)
    {
      Thread.Sleep(25);
      if (progress != null)
      {
        progress.Report(i);
      }
    }
  }
}

public void GoAsync() //no longer async as it blocks on Appication.Run
{
    var owner = new Win32Window(Process.GetCurrentProcess().MainWindowHandle);
    _progressForm = new Form1();
    var progress = new Progress<int>(value => _progressForm.UpdateProgress(value));
    _progressForm.Activated += async (sender, args) =>
        {
            await Go(progress);
            _progressForm.Close();
        };
    Application.Run(_progressForm);
}

private async void button1_Click(object sender, EventArgs e)
{
    IProgress<int> progress = new Progress<int>(value => { progressBar1.Value = value; });
    await Task.Run(() =>
    {
        for (int i = 0; i <= 100; i++)
            progress.Report(i);
    });
}