UI在重度计算时冻结

我正在将大量文件加载到内存中，但在此计算中，我的应用程序已冻结。

知道我的代码有什么问题吗？

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(); } 

Answer 1

我将你的样本转换成这样的东西：

 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; } 

Answer 2

我不确定它是否是您的问题的原因，但是您在后台工作程序的回调中设置了args.Handled ，因此它将在drop事件处理程序返回后调用。 由于设置得太晚，它不会产生预期的效果，并且可能会在事件处理中弄乱一些东西。