用户界面因大量计算而冻结 [英] UI freezes on heavy calculation

问题描述

我正在将大量文件加载到内存中，但是根据这种计算，我的应用程序冻结了。

I am loading huge files to the memory but on this calculation my application is freezes .

任何人都知道我的代码有什么问题吗？

Any idea what is the issue with my code ?

public void Drop(DragEventArgs args)
{
  BackgroundWorker worker = new BackgroundWorker();
  string fileName = IsSingleTextFile(args);
  if (fileName == null) return;
  worker.DoWork += (o, ea) =>
  {
    try
    {
      StreamReader fileToLoad = new StreamReader(fileName);
      string filecontent = fileToLoad.ReadToEnd();
      fileToLoad.Close();
      // providing the information to the UI thread

      Application.Current.Dispatcher.BeginInvoke(DispatcherPriority.Background,
        new Action(() => SfmLogFile = filecontent));
    }
    catch (Exception)
    {
      throw;
    }
  };

  worker.RunWorkerCompleted += (o, ea) =>
  {
    args.Handled = true;
    IsBusy = false;
  };

  // Mark the event as handled, so TextBox's native Drop handler is not called.

  IsBusy = true;
  worker.RunWorkerAsync();

}

推荐答案

I' d将您的样本转换为如下形式：

I'd transform your sample to something like this:

public void Drop(DragEventArgs args)
{
  string fileName = IsSingleTextFile(args);
  if (fileName == null) return;
  // It is better to create worker after check for file name.
  BackgroundWorker worker = new BackgroundWorker();
  worker.DoWork += (o, ea) =>
  {
    try
    {
      string filecontent = ReadAllText(fileName);    
      ea.Result = fileContent;
    }
    catch (Exception)
    {
      throw;
    }
  };

  worker.RunWorkerCompleted += (o, ea) =>
  {
    var fileContent = ea.Result as string;
    Application.Current.Dispatcher.BeginInvoke(DispatcherPriority.Background,
        new Action(() => SfmLogFile = filecontent));

    // if IsBusy propery is not on the UI thread, then you may leave it here
    // otherwise it should be set using the dispatcher too.
    IsBusy = false;
  };

  IsBusy = true;
  worker.RunWorkerAsync();
  // Mark the event as handled, so TextBox's native Drop handler is not called.    
  args.Handled = true;
}

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