我正在嘗試使用 Syncfusion PDF 查看器，但為了使用它，我最終必須將 xaml 頁面保存為 pdf 文件。我怎么做？我點擊了此鏈接，但它沒有給我想要的東西。XAML 到 PDF 轉換我正在嘗試使用下面的代碼來保存 xaml 頁面 [ new GenericManifestPDF(_manifestPDFDataModel); ] 從我的視圖模型類中得到這個錯誤：' Value does not fall within the expected range ' in this line await renderTargetBitmap.RenderAsync(new GenericManifestPDF(_manifestPDFDataModel));   PdfDocument document = new PdfDocument();   //Add a new page   PdfPage page = document.Pages.Add();   //Initialize render to bitmap   var logicalDpi = DisplayInformation.GetForCurrentView().LogicalDpi;   var renderTargetBitmap = new RenderTargetBitmap();   //Create a Bitmap from XAML page   await renderTargetBitmap.RenderAsync(new GenericManifestPDF(_manifestPDFDataModel));   var pixelBuffer = await renderTargetBitmap.GetPixelsAsync();   //Save the XAML in bitmap image   using (var stream = new Windows.Storage.Streams.InMemoryRandomAccessStream())   {   var encoder = await BitmapEncoder.CreateAsync(BitmapEncoder.JpegEncoderId, stream);   encoder.SetPixelData(   BitmapPixelFormat.Bgra8,   BitmapAlphaMode.Ignore,   (uint)renderTargetBitmap.PixelWidth,   (uint)renderTargetBitmap.PixelHeight,   logicalDpi,   logicalDpi,   pixelBuffer.ToArray());   await encoder.FlushAsync();   //Load and draw the bitmap image in PDF   PdfImage img = PdfImage.FromStream(stream.AsStream());   if (img.Width > img.Height)      document.PageSettings.Orientation = PdfPageOrientation.Portrait;          else                                                                                      document.PageSettings.Orientation = PdfPageOrientation.Landscape;       var section = document.Sections.Add();       section.PageSettings.Size = new SizeF(img.Width, img.Height);       page = section.Pages.Add();       page.Graphics.DrawImage(img, new RectangleF(0, 0, img.Width, img.Height));                                        }