c#執行並行任務之Parallel與TaskFactory

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本文轉載自 http://www.cnblogs.com/icyJ/p/Parallel_TaskFactory.html 很厲害的文章

Barrier _bar;int _maxLength = 20, _maxChannel = 2;//同時最多2條通道，每條通道最多20個資料bool _isCancel = false;private void btnWrite_Click(object sender, EventArgs e){    var tmpEmails = _emails.Where(x => !x.Value).Select(x => x.Key).ToList();    var state = 0;    _isCancel = false;    SetControlEnable(false);    lblProgress.Text = "* 已完成 0%";    var channels = (tmpEmails.Count / _maxLength) + ((tmpEmails.Count % _maxLength > 0) ? 1 : 0);//總共多少條通道    var times = (channels / _maxChannel) + ((channels % _maxChannel > 0) ? 1 : 0);//單伺服器分多次    new Action(() =>    {        for (int j = 0; j < times; j++)        {            if (_isCancel)            {                MessageBox.Show("任務取消！");                break;            }            var currChannel = Math.Min(_maxChannel, (channels - j * _maxChannel));//兩者取其小的            _bar = new Barrier(currChannel);//根據次數設定柵欄            var tasks = new Action[currChannel];            for (int i = 0; i < currChannel; i++)            {                var subData = tmpEmails.Skip((i + j * _maxChannel) * _maxLength).Take(_maxLength).ToList();                tasks[i] = () =>                {                    if (_isCancel) return;                    var resMsg = 0;                    Connect2WCF.RunSync(sc => resMsg = sc.UpdateMailState(subData, state));                    if (resMsg == -1)                        MessageBox.Show("儲存失敗了？詳情可以查資料庫日誌表");                    else if (resMsg == 0)                        subData.ForEach(one => _emails[one] = true);//標記已經完成的。                    new Action(() => txtEmails.Text = string.Join("\r\n", _emails.Where(x => !x.Value).Select(x => x.Key))).InvokeRun(this);                    _bar.SignalAndWait();                };            }            Parallel.Invoke(tasks);            new Action(() => lblProgress.Text = "* 已完成 " + ((100 * (j + 1) / times)) + "%").InvokeRun(this);        }        new Action(() => SetControlEnable(true)).InvokeRun(this);    }).RunThread();}

CancellationTokenSource cts = new CancellationTokenSource();int maxLength = 20, maxChannel = 2;//同時最多2條通道，每條通道最多20個資料private void btnWrite_Click(object sender, EventArgs e){    cts = new CancellationTokenSource();    var tmpEmails = _emails.Where(x => !x.Value).Select(x => x.Key).ToList();    var state = 0;    SetControlEnable(false);    lblProgress.Text = "* 已完成 0%";    var channels = (tmpEmails.Count / maxLength) + ((tmpEmails.Count % maxLength > 0) ? 1 : 0);//總共多少條通道    var times = (channels / maxChannel) + ((channels % maxChannel > 0) ? 1 : 0);//單伺服器分多次    Action<List<string>, CancellationToken> doSave = (data, ct) =>    {        if (ct.IsCancellationRequested) return;        var msg = 0;        Connect2WCF.RunSync(sc => msg = sc.UpdateMailState(data, state));        if (msg == -1)            MessageBox.Show("儲存失敗了？詳情可以查資料庫日誌表");        else if (msg == 0)            data.ForEach(one => _emails[one] = true);//標記已經完成的。        new Action(() => txtEmails.Text = string.Join("\r\n", _emails.Where(x => !x.Value).Select(x => x.Key))).InvokeRun(this);    };    for (int j = 0; j < times; j++)    {        int k = j;        if (cts.Token.IsCancellationRequested)        {            MessageBox.Show("任務取消！");            break;        }        var currChannel = Math.Min(maxChannel, (channels - j * maxChannel));//兩者取其小的        TaskFactory taskFactory = new TaskFactory();        Task[] tasks = new Task[currChannel];        for (int i = 0; i < currChannel; i++)        {            var subData = tmpEmails.Skip((i + j * maxChannel) * maxLength).Take(maxLength).ToList();            tasks[i] = new Task(() => doSave(subData, cts.Token), cts.Token);        }        taskFactory.ContinueWhenAll(tasks,            x => new Action(() => lblProgress.Text = "* 已完成 " + ((100 * (k + 1) / times)) + "%").InvokeRun(this), CancellationToken.None);        Array.ForEach(tasks, x => x.Start());    }    SetControlEnable(true);}

 

c#執行並行任務之Parallel與TaskFactory