WPF處理任務拋出的異常

Question

我如何處理WPF中在工作線程中引發的異常？

public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();
    }

    private void MainWindow_OnLoaded(object sender, RoutedEventArgs e)
    {
        var task = Task.Factory.StartNew(() =>
        {
            Debug.WriteLine("Hello");
            throw new Exception();
        });

        try
        {
            task.Wait();
        }
        catch (Exception ex)
        {
            Debug.WriteLine(ex.Message);
        }

    }
}  

還是用這種方式處理異常並不常見？

Answer 1

task.ContinueWith(task => {
      if (task .Exception != null)
                    {
                        //.........
                    }

},TaskContinuationOptions.OnlyOnFaulted);

在這里看看http://www.codeproject.com/Articles/152765/Task-Parallel-Library-of-n#handlingExceptions

Answer 2

您可以捕獲[System.AggregateException]以檢查是否可以處理其任何InnerExceptions 。 請參見下面的示例。

var task = Task.Factory.StartNew(() =>
{
    Debug.WriteLine("Hello");
    throw new InvalidOperationException(); // throw an InvalidOperationException that is handled.
});

try
{
    task.Wait();
}
catch (AggregateException ae)
{
    ae.Handle((x) =>
    {
        if (x is InvalidOperationException) // We know how to handle this exception.
        {
            Console.WriteLine("InvalidOperationException error.");
            return true; // Continue with operation.
        }
        return false; // Let anything else stop the application.
    });
}