XAML 到 XPS 内存泄漏

Question

对于 windows 服务项目，我必须以 xps 格式制作报告。我有 xaml 代码，我将其转换为 xps 文档：

private void th_PrintErrorReport(OrderReportData reportData)
{
  ...

  //Use the XAML reader to create a FlowDocument from the XAML string.
  FlowDocument document = XamlReader.Load(new XmlTextReader(new  StringReader(vRawXaml))) as FlowDocument;

  //create xps file
  using (XpsDocument xpsDoc = new XpsDocument(vFilePath, System.IO.FileAccess.Write, CompressionOption.Maximum))
  {
    // create a serialization manager
    using (XpsSerializationManager rsm = new XpsSerializationManager(new XpsPackagingPolicy(xpsDoc), false))
    {
      // retrieve document paginator
      DocumentPaginator paginator = ((IDocumentPaginatorSource)document).DocumentPaginator;

      // save as XPS
      rsm.SaveAsXaml(paginator);

      rsm.Commit();
    }
  }
}

这可行，但不幸的是会造成内存泄漏，创建的每个报告都会在内存中留下 wpf 控件（contentpresent、标签等）。我用内存分析器检查了这个。我检查了像 this one and this one 这样的主题，这让我认为 wpf dispatcher/message 泵是问题所在。为了制作消息泵运行，我将代码更改为：

    public void StartHandling()
    {
        _ReportPrintingActive = true;

        //xaml parsing has to run on a STA thread
        _ReportPrintThread = new Thread(th_ErrorReportHandling);
        _ReportPrintThread.SetApartmentState(ApartmentState.STA);
        _ReportPrintThread.Name = "ErrorReportPrinter";
        _ReportPrintThread.Start();
    }

    private void th_ErrorReportHandling()
    {            
        Dispatcher.Run();
    }

    public void PrintErrorReport(OrderReportData reportData)
    {
        Action action = () =>
        {
            th_PrintErrorReport(reportData);
        };
        Dispatcher.FromThread(_ReportPrintThread).BeginInvoke(action);
    }

但是还是没有成功。我错过了什么？

Answer 1

使用此 post 中的反射代码消除了内存泄漏：

XAML 到 XPS 内存泄漏

XAML to XPS memory leak

wpf

xaml

memory-leaks

dispatcher

xps