支持的进展情况，并在.NET 4.0和QUOT增量的结果;任务并行库＆QUOT; [英] Support of progress reporting and incremental results in .NET 4.0 "Task Parallel Library"

问题描述

我知道，任务并行库仍处于测试阶段，也有可能是更少的资源可用，但无论从那个我看了，图书馆给人很特别的待遇的任务调度<​​/A>，异常处理和的cancellation 。

I know that Task Parallel Library is still in Beta and there are likely to be less resources available but from whatever I have read, library gives very special treatment to task scheduling, exception handling and cancellation.

但我不觉得为进度从任务报告和发送增量结果的任何引用。这两个事情似乎太重要了，不容忽视。你能否对如何在任务并行库处理这些一些轻或引用一些文章，这也解释了他们？

But I don't find any references to progress reporting and sending incremental results from tasks. These 2 things seem too important to ignore. Can you throw some light on how to handle these in Task Parallel Library or refer some articles which explains them?

推荐答案

此示例更新进度条：

using System;   
using System.Threading;   
using System.Threading.Tasks;   
using System.Windows.Forms;   

class SimpleProgressBar : Form   
{   
    [STAThread]   
    static void Main(string[] args)   
    {   
        Application.EnableVisualStyles();   
        Application.Run(new SimpleProgressBar());   
    }   

    protected override void OnLoad(EventArgs e)   
    {   
        base.OnLoad(e);   

        int iterations = 100;   

        ProgressBar pb = new ProgressBar();   
        pb.Maximum = iterations;   
        pb.Dock = DockStyle.Fill;   
        Controls.Add(pb);   

        Task.ContinueWith(delegate   
        {   
            Parallel.For(0, iterations, i =>  
            {   
                Thread.SpinWait(50000000); // do work here   
                BeginInvoke((Action)delegate { pb.Value++; });   
            });   
        });   
    }   
}  

<一个href="http://social.msdn.microsoft.com/Forums/en-US/parallelextensions/thread/38d7a436-e1d1-4af8-8525-791ebeed9663"相对=nofollow>从内更新一个进度条的Parallel.For

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