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POAsync/Await with a WinForms ProgressBar - WinForms version
 

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  1. POAsync/Await with a WinForms ProgressBar - WinForms version
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    <p>Please see: <a href="http://codepaste.net/djw3cw" rel="nofollow noreferrer">http://codepaste.net/djw3cw</a> for the code</p> <p>If it's true that async/await for asynchronous programming will soon be like Linq, I think this question is a non-trivial extension of <a href="https://stackoverflow.com/questions/17972268/async-await-with-a-winforms-progressbar">Async/Await with a WinForms ProgressBar</a> </p> <p>I would be greatful for a pointer or an answer in words in lieu of code, though code is optimal.</p> <p>The issue is this: how to set up a progress bar to work using asynch/await. In the past I've used a Dispatcher successfully.</p> <pre><code>Please see: http://codepaste.net/djw3cw for the code What is done: a textbox has any text in it converted to an int, then when "mybutton1" is clicked, work is done based on the int, for int ms (int = milliseconds). During this time, a progressbar "myProgressBar" is shown for every tenth-percent step When work is complete, the label/textblock controls are updated But the below does not work right: the form simply freezes until the work is complete. How to fix it? How to do this using Task-based Asynchronous Pattern (TAP) or Async/Await, rather than a Dispatcher? </code></pre> <p>Here is a snippet of the code in question, self-explanatory. </p> <pre><code> private void mybutton1_Click(object sender, RoutedEventArgs e) { myLabel.Content = myTextBox.Text; string myString = myTextBox.Text; bool result = Int32.TryParse(myString, out myInteger); if (result == true) { myTextblock.Text = "Success, thread will be delayed by: " + myInteger.ToString() + " ms"; // int CounterInteger = 0; for (int j = 0; j &lt; myInteger; j++) // set # itt { Thread.Sleep(1); //do some work here // myClassDoWork1.Delay_DoWork(myInteger); //optional way to do work in another class... if (j % (myInteger / 10) == 0) //display progress bar in 10% increments { CounterInteger = CounterInteger + 10; myProgressBar.Value = (double)CounterInteger; // won't work here in a parallel manner...must use Dispatcher.BeginInvoke Action //how to make this work using Async/Await? see: https://stackoverflow.com/questions/17972268/async-await-with-a-winforms-progressbar } } /// /// // above does not work properly: the form simply freezes until the work is complete. How to fix it? /// myLabel.Content = "done, delayed work done successfully: in " + myInteger.ToString() + " milliseconds"; myTextblock.Text = "done, delayed work done successfully: in " + myInteger.ToString() + " milliseconds"; return; } else { myTextblock.Text = "Error, integer not entered, try again." + myTextBox.Text; myLabel.Content = "Error, integer not entered, try again."; return; } } </code></pre>
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    1. USPaulDecember
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    1. COPlease edit the code into your question - ideally edited to be as short as possible while still being complete and demonstrating the problem.
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    2. COHi Jon--I actually am reading your book on this topic "C# In Depth". Do you see the code at CodePaste OK? I find that cutting and pasting code here does not work very well for me, sorry.
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    3. COYes, I can see the code at CodePaste - but it's simply not a good way of asking a question. It's worth becoming familiar with the Stack Overflow markdown editor (and preview window) - formatting your question clearly (and not just linking to code offsite) is important in creating a good question.
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      1. POAsync/Await with a WinForms ProgressBar - WinForms version
      1. USJon Skeet
 

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