How to Implement Background Task Execution with Progress Reporting and Cancellation in WPF?

Background Task Execution in WPF with Progress Reporting and Cancellation

In a WPF application, asynchronous task execution is essential for maintaining a responsive user interface while performing long-running operations. The recommended approach for achieving this with progress reporting and cancellation support is to use the Task-based Asynchronous Pattern (TAP) and async/await keywords.

Requirements:

• Block UI thread
• Provide progress reporting
• Be cancelable
• Support multithreading

Solution:

With .NET 4.5 (or .NET 4.0 with Microsoft.Bcl.Async), TAP and async/await offer a convenient and structured solution. Here's an example:

private async void Start(object sender, RoutedEventArgs e)
{
    try
    {
        await Task.Run(() =>
        {
            int progress = 0;
            while (true)
            {
                System.Threading.Thread.Sleep(1);
                progress++;
                Logger.Info(progress);
            }
        });
    }
    catch (Exception ex)
    {
        MessageBox.Show(ex.Message);
    }
}

Advantages:

• Sequential Code Flow: Allows for intuitive and easy-to-read code.
• Structured Exception Handling: Error handling is encapsulated within the try/catch block.
• Multithreading Support: Tasks can be executed on multiple threads, enabling concurrency.

Additional Resources:

• [How to execute task in the WPF background while able to provide report and allow cancellation?](stackoverflow.com/questions/6743198/how-to-execute-task-in-the-wpf-background-while-able-to-provide-report-and-a)
• [Async in 4.5: Enabling Progress and Cancellation in Async APIs](msdn.microsoft.com/en-us/library/hh191443)
• [Async and Await](msdn.microsoft.com/en-us/library/dd997377)
• [Async/Await FAQ](msdn.microsoft.com/en-us/library/hh973923)

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