在Dispatcher中抛出“System.OutOfMemoryException”类型的异常

Question

请帮我了解一下出了什么问题。我有一个进度条方法来开始在一个任务中运行进度条。基类是静态类，它保存来自另一个类的更新值。下面是我的代码：

private void startProgressBarBA()
    {
        int tempBA = 0;
        proBing.Maximum = Int32.Parse(cboGeoThreshold.Text);

        CancellationTokenSource bingBarToken = new CancellationTokenSource();
        Task bingTask = Task.Factory.StartNew(() =>
        {
            while (!bingBarToken.Token.IsCancellationRequested)
            {
                if (tempBA != Base.proBaValue)//Reduce the number of same value assigned.
                {
                    try
                    {
                        Dispatcher.BeginInvoke(new Action(() =>
                        {
                            if (proBing.Value == proBing.Maximum)
                            {
                                proBing.Value = 0;
                                Base.proBaValue = 0;
                            }
                            proBing.Value = Base.proBaValue;
                            tempBA = Base.proBaValue;
                            baRecord.Content = proBing.Value + "/" + proBing.Maximum;
                        }
                        ));
                    }
                    catch(OutOfMemoryException e)
                    {
                        throw e;
                    }
                }
                if (Base.checkTaskBA == false)
                {
                    bingBarToken.Cancel();
                }
            }
        },bingBarToken.Token, TaskCreationOptions.LongRunning,TaskScheduler.Default);
    }

异常将在一定时间后发生，并且

Dispatcher.BeginInvoke

已经被强调了。以下是异常消息：

System.OutOfMemoryException was unhandled by user code
  HResult=-2147024882
  Message=Exception of type 'System.OutOfMemoryException' was thrown.
  Source=View
  StackTrace:
   at View.MainWindow.<>c__DisplayClass21_0.<startProgressBarBA>b__0() in C:\Wade\GeocodingApp\Geocoder_v21_Rev_pcode\View\MainWindow.xaml.cs:line 331
   at System.Threading.Tasks.Task.InnerInvoke()
   at System.Threading.Tasks.Task.Execute()
  InnerException: 

如何解决这个问题？是因为

new Action()

导致OutOfMemoryException？谢谢大家的帮助。

Answer 1

只是在这里猜测一下，但是看起来任务中的"while“循环没有任何延迟。

这意味着您正在非常快地遍历该循环，并且正在Dispatcher队列上创建大量异步“调用”消息--毫无疑问，这正在耗尽所有memory....they处理不够快的时间，因此正在生成(即必须创建了1000万/数百万"Action“对象)。

可能的solution....put在wait循环中的某种“等待”，例如一个Thread.Sleep(100) --您不需要经常发送它们来指示进度。

private void startProgressBarBA()
{
    int tempBA = 0;
    proBing.Maximum = Int32.Parse(cboGeoThreshold.Text);

    CancellationTokenSource bingBarToken = new CancellationTokenSource();
    Task bingTask = Task.Factory.StartNew(() =>
    {
        while (!bingBarToken.Token.IsCancellationRequested)
        {
            if (tempBA != Base.proBaValue)//Reduce the number of same value assigned.
            {
                try
                {
                    Dispatcher.BeginInvoke(new Action(() =>
                    {
                        if (proBing.Value == proBing.Maximum)
                        {
                            proBing.Value = 0;
                            Base.proBaValue = 0;
                        }
                        proBing.Value = Base.proBaValue;
                        tempBA = Base.proBaValue;
                        baRecord.Content = proBing.Value + "/" + proBing.Maximum;
                    }
                    ));
                }
                catch(OutOfMemoryException e)
                {
                    throw e;
                }
            }
            if (Base.checkTaskBA == false)
            {
                bingBarToken.Cancel();
            }

            Thread.Sleep(100);
        }
    },bingBarToken.Token, TaskCreationOptions.LongRunning,TaskScheduler.Default);
}