所有,我有一個方法叫做TaskSpin
,它使用TPL在後臺線程上運行傳遞的方法。使用任務繼續堆棧作業
public TaskSpin(Func asyncMethod, object[] methodParameters)
{
...
asyncTask = Task.Factory.StartNew<bool>(() =>
asyncMethod(uiScheduler, methodParameters));
asyncTask.ContinueWith(task =>
{
...
// Finish the processing update UI etc.
...
if (isStacked && task.Status == TaskStatus.RanToCompletion)
ProcessNextTask(dataGridViewSite);
}
...
}
這個程序是公認的,一時間火過一個方法,但我最近一直需要排隊多種方法和順序運行它們。要做到這一點(由this answer資助)我寫了下面的按鈕單擊事件處理程序
private void buttonProcAllUrg_Click(object sender, EventArgs e)
{
// Build the stacker.
Dictionary<Func<TaskScheduler, object[], bool>, object[]> taskPair =
new Dictionary<Func<TaskScheduler, object[], bool>, object[]>();
this.taskQueue =
new Queue<KeyValuePair<Func<TaskScheduler, object[], bool>, object[]>>();
// Populate the stacker.
foreach (DataGridViewRow row in this.DataGridViewDrg.Rows)
{
KeyValuePair<Func<TaskScheduler, object[], bool>, object[]> task =
new KeyValuePair<Func<TaskScheduler, object[], bool>, object[]>
(BuildDrgDataForSite, DrgDataRowInfo(row.Index));
this.taskQueue.Enqueue(task);
}
// Launch the queue.
ProcessNextTask(this.DataGridViewDrg);
}
和ProcessNextTask被定義爲
private void ProcessNextTask(DataGridView dataGridView)
{
try
{
// Queue empty.
bIsStacked = true;
if (this.taskQueue.Count <= 0)
{
bIsStacked = false;
return;
}
// Launch new task.
KeyValuePair<Func<TaskScheduler, object[], bool>, object[]> item = this.taskQueue.Dequeue();
Task<bool> asyncBuildDataTask = null;
TaskSpin(asyncBuildDataTask, uiScheduler, mainForm,
item.Key, item.Value, dataGridView,
"Process stack successfully executed", true, bIsStacked);
}
catch(InvalidOperationException)
{
// Nothing left in stack.
bIsStacked = false;
}
}
這工作得很好的方法,但第一個任務已經運行後在繼續進行第二次(或更多次)調用ProcessNextTask
時,GUI變得無響應。我能做些什麼來確保UI線程在第二次調用時不被阻塞?
注意。我曾嘗試推出ProcessNextTask
方法在另一個線程使用UI線程同步上下文
Task task = Task.Factory.StartNew(() =>
{
ProcessNextTask(dataGridView);
}, CancellationToken.None,
TaskCreationOptions.LongRunning,
uiScheduler);
其中TaskScheduler uiSchduler = TaskScheduler.FromCurrentSynchonisationContex();
。
編輯:我已經attampted創建BlockingCollection
,以方便我想基於以下@Reed科普塞的回答做的,但我從來沒有這樣做,將在這裏歡迎任何建議
BlockingCollection<Action<object[]>> taskQueue =
new BlockingCollection<Action<object[]>>();
foreach (DataGridViewRow row in this.DataGridViewDrg.Rows)
{
Action<object[]> tmpAction = del =>
{AsyncBuildDrgDataForSite(DrgDataRowInfo(row.Index)); };
taskQueue.Add(tmpAction);
}
感謝您的時間。
我爲什麼要解僱史蒂夫喬布斯? – MoonKnight 2012-08-01 16:26:27
我喜歡它......:] – MoonKnight 2012-08-01 17:03:13