与回调例如超线程不起作用。 [英] Threading with Callback example does not work.

问题描述

我工作的这个例子，但我无法网回调和线程。
我想这是什么。结果
1）按按钮
2）启动进度条跑
3）调用一个新的线程来执行一些长时间运行的进程
4）在长期运行过程中的回调应触发进度条停止。

下面我有东西......虽然DoSomethingInThread回调参数进来为空。
的StopProgressBar（）作用于进度控制，所以它不能是静态

 静态布尔做的; 
静态只读对象更衣室=新的对象（）; 
静态ParameterizedThreadStart threadStarter =新ParameterizedThreadStart（DoSomethingInThread）; 
私人主题的WorkerThread =新主题（threadStarter）; 
公众委托无效StopProgressBarCallback（）
 
公共Form1中（）
 {
的InitializeComponent（）; 
} 
 
私人无效的button1_Click（对象发件人，EventArgs五）
 {
 StartProgressBar（）; 
 workerThread.Start（）; 
} 
 
静态无效DoSomethingInThread（对象回调）
 {
 StopProgressBarCallback塞=回调为StopProgressBarCallback; 
锁（柜）
 {
的Thread.Sleep（5 * 1000）; 
} 
塞（）; 
} 
 
私人无效StartProgressBar（）
 {
 progressBar1.MarqueeAnimationSpeed = 30; 
 progressBar1.Style = ProgressBarStyle.Marquee; 
} 
 
公共无效StopProgressBar（）
 {
 progressBar1.Style = ProgressBarStyle.Continuous; 
} 
  

解决方案

有一个看< A HREF =http://msdn.microsoft.com/en-us/library/system.componentmodel.backgroundworker.aspx相对=nofollow> BackgroundWorker的类，它更适合于你想什么做和一大堆容易得到同！交手

通常情况下，你不应该永远是newing'了线程实例。这是更好地使用线程池，背景工人或者如果你是在.NET 4中，任务对象从线程并行库。

I am working on this example, but I am unable to mesh the callback and the threading. What I want is this.
1) Press button 2) Start the progress bar running 3) Call to a new thread to perform some long running process 4) A callback on the long running process should trigger the progress bar to stop.

Below I have something...Although the callback parameter for DoSomethingInThread comes in as null. The StopProgressBar() acts on the ProgressBar control, so it cannot be static.

    static bool done;
    static readonly object locker = new object();
    static ParameterizedThreadStart threadStarter = new ParameterizedThreadStart(DoSomethingInThread);  
    private Thread workerThread = new Thread(threadStarter);
    public delegate void StopProgressBarCallback()

    public Form1()
    {
        InitializeComponent();
    }

    private void button1_Click(object sender, EventArgs e)
    {
        StartProgressBar();
        workerThread.Start();
    }

    static void DoSomethingInThread(object callback)
    {
        StopProgressBarCallback stopper = callback as StopProgressBarCallback;
        lock (locker)
        {
            Thread.Sleep(5 * 1000);
        }
        stopper();
    }

    private void StartProgressBar()
    {
        progressBar1.MarqueeAnimationSpeed = 30;
        progressBar1.Style = ProgressBarStyle.Marquee;
    }

    public void StopProgressBar()
    {
        progressBar1.Style = ProgressBarStyle.Continuous;
    }

解决方案

Have a look at the backgroundworker class, it is more suitable for what you are trying to do and a whole lot easier to get to grips with!

Generally, you shouldn't ever be 'newing' up Thread instances. It is better to use the thread pool, a background worker or if you're on .net 4, a task object from the thread parallel library.

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