无阻塞顺序异步任务

有没有一种标准的方法来实现这一点,或“最佳实践”?

BackgroundWorker 我立刻感到快乐和轻微的恐惧。启动整个程序的代码让人感觉特别不舒服。我觉得一定有更好的办法,或者至少有一个既定的办法。

非常感谢你的建议。

丹

protected void runAsyncTask(SequentialTask seqTask)
    {
        if (HasErrored) return;

        DoWorkEventHandler worker = (s, e) =>
        {
            setTaskStartStatusMessage(seqTask.TaskMessage);
            ShowProgress = true;
            seqTask.Task((BackgroundWorker)s);
        };

        ProgressChangedEventHandler progress = (s, e) =>
        {
            if (seqTask.TaskProgress != null)
                seqTask.TaskProgress(e.ProgressPercentage, e.UserState);
        };

        RunWorkerCompletedEventHandler done = null;
        done = (s, e) =>
        {
            ShowProgress = false;
            if (e.Error != null)
            {
                HasErrored = true;
                displayTaskExceptionMessage(e.Error, seqTask.TaskMessage);
            }
            else
            {
                setTaskCompleteStatusMessage(seqTask.TaskMessage);
                if (seqTask.TaskComplete != null)
                    seqTask.TaskComplete();
            }
            ((BackgroundWorker)s).RunWorkerCompleted -= done;
            ((BackgroundWorker)s).DoWork -= worker;
            ((BackgroundWorker)s).ProgressChanged -= progress;

            if (seqTask.NextTask != null && (seqTask.CanExecuteNext == null ? true : seqTask.CanExecuteNext()))
                runAsyncTask(seqTask.NextTask);
        };

        if (seqTask.TaskProgress != null)
            backgroundWorker.WorkerReportsProgress = true;
        backgroundWorker.DoWork += worker;
        backgroundWorker.RunWorkerCompleted += done;
        backgroundWorker.ProgressChanged += progress;
        backgroundWorker.RunWorkerAsync();
    }

SequentialTask 只是一组简单的属性:

public class SequentialTask
{
    public Action<BackgroundWorker> Task { get; set; }
    public String TaskMessage { get; set; }
    public Func<bool> CanExecuteNext { get; set; }
    public Action<int, object> TaskProgress { get; set; }
    public Action TaskComplete { get; set; }
    public SequentialTask NextTask { get; set; }
}

这导致了类似Perl的语法:

runAsyncTask(new SequentialTask()
        {
            Task = (x) => loadFile(),
            TaskMessage = "Load File",
            CanExecuteNext = null,
            NextTask = new SequentialTask()
            {
                Task = (x) => validateImport(),
                TaskMessage = "Validate Input Lines",
                TaskComplete = () =>
                {
                    if (!ImportIsValid)
                        displayValidationMessages();
                },
                CanExecuteNext = () => ImportIsValid,
                NextTask = new SequentialTask()
                {