


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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