public void LoadXslt(XDocument xXmlInputDoc, XDocument xXslFOXsltDoc, XslFOPdfOptions pdfOptions)
{
TriggerLoadStart();
//NOTE: We Lock this entire method because it is the Core method for the UI Control and we don't want this Control
// to allow primary processing by more than one Thread at a time. Though Background threads are launched
// to not block the UI thread, this is not intended to process multiple items at a Time and this
// block contains code where critical values are being modified.
lock (_threadLock)
{
ClearLog();
var uiTaskFactory = new TaskFactory(_uiThreadScheduler);
LogItem("XslFO Pdf Render Process Starting.");
var timerOverall = Stopwatch.StartNew();
//Execute the Work Async, with a Continuation back on the UI Thread when completed.
var workerTask = Task.Factory.StartNew <XslFORenderFileOutput>(() =>
{
//***********************************************************
//Initialize and Compile the XsltTransformer
//***********************************************************
LogItem("Xslt Compile Starting.");
var timer = Stopwatch.StartNew();
var xmlResolver = new XmlUrlExtendedResolver(pdfOptions.BaseDirectory);
XslTransformEngine xslTransformer = xXslFOXsltDoc.CreateXslTransformEngine(new XslTransformEngineOptions()
{
XsltDocumentResolver = xmlResolver,
XsltLoadResolver = xmlResolver
});
LogItem("Xslt Compile Completed in [{0}] seconds.", timer.Elapsed.TotalSeconds);
//***********************************************************
//Execute the Xslt Transformation
//***********************************************************
LogItem("Xslt Execution Starting.");
timer.Restart();
var xXslFOResultsDoc = xslTransformer.TransformToXDocument(xXmlInputDoc);
LogItem("Xslt Execution Completed in [{0}] seconds.", timer.Elapsed.TotalSeconds);
//***********************************************************
//Render the XslFO results into a Pdf
//***********************************************************
//return xXmlInputDoc.TransformToPdfFile(xslTransformer, tempPdfFileInfo, pdfOptions, _fnFonetEventHandler, _fnFonetEventHandler, _fnXsltEventHandler);
LogItem("Pdf Render Starting.");
timer.Restart();
var XslFORenderedOutput = xXslFOResultsDoc.RenderXslFOToPdfFile(GetTempFileHelper(), new XslFORenderOptions()
{
PdfOptions = pdfOptions,
RenderErrorHandler = GetFONetErrorHandler(),
RenderEventHandler = GetFONetEventHandler()
});
LogItem("Pdf Render Completed in [{0}] seconds.", timer.Elapsed.TotalSeconds);
//***********************************************************
//Finally Return the Renderd Output from the the Background
//Thread so that the results can be processed on the UI!
//***********************************************************
return(XslFORenderedOutput);
}).ContinueWith((workTask) =>
{
//NOTE: Since this is the Followup Thread executing we must check to see if the Background Thread Faulted and handle it correctly.
//This allows us to process the Exception back on the UI Thread instead of loosing it on the background thread.
if (workTask.IsFaulted)
{
String renderSource = String.Empty;
var innerException = workTask.Exception.InnerException;
if (innerException is XslTransformEngineException)
{
renderSource = innerException.As <XslTransformEngineException>().XsltOutput;
}
else if (innerException is XslFORenderException)
{
renderSource = innerException.As <XslFORenderException>().RenderSource;
}
this.LoadStatus = XslFOViewerControlState.Unloaded;
RaiseViewerError(new XslFOViewerEventArgs("Exception Occurred Processing the Transformer. Inner Exception Details: {0}".FormatArgs(workTask.Exception.GetMessages()), renderSource));
}
else
{
//Halt and Wait for the workerTask's result!
//NOTE: This DOES NOT Halt our UI, because this is only invoked within our ContinueWith continuation of the Parallel Task
// which will handle the coordination and usher our results back to the UI Thread via the ThreadScheduler parameter below!
LogItem("XslFO Pdf Render Process Completed in [{0}] seconds.", timerOverall.Elapsed.TotalSeconds);
TriggerLoadFile(workTask.Result);
}
//Cleanup Temp File once loaded because Acrobat ActiveX Control no longer needs it
//NOTE: Acrobot can browse the file after it is loaded, however Find/Search functionality is broken
// so we cannot delete the file pre-maturely.
//CleanupTempFileHelper();
}, _uiThreadScheduler);
}
}
