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POAsync/Await with a WinForms ProgressBar
 

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    <p>I've gotten this type of thing working in the past with a BackgroundWorker, but I want to use the new async/await approach of .NET 4.5. I may be barking up the wrong tree. Please advise.</p> <p><strong>Goal</strong>: Create a component that will do some long-running work and show a modal form with a progress bar as it's doing the work. The component will get the handle to a window to block interaction while it's executing the long-running work.</p> <p><strong>Status</strong>: See the code below. I thought I was doing well until I tried interacting with the windows. If I leave things alone (i.e. don't touch!), everything runs "perfectly", but if I do so much as click on either window the program hangs after the long-running work ends. Actual interactions (dragging) are ignored as though the UI thread is blocked.</p> <p><strong>Questions</strong>: Can my code be fixed fairly easily? If so, how? Or, should I be using a different approach (e.g. BackgroundWorker)?</p> <p><strong>Code</strong> (Form1 is a standard form with a ProgressBar and a public method, UpdateProgress, that sets the ProgressBar's Value):</p> <pre><code>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&lt;bool&gt; 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 &lt;= 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; } } } } </code></pre>
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