//Create a pdf document
PdfDocument doc = new PdfDocument();
//Add page
doc.getPages().add();
//Set tab order
doc.getPages().get(0).setTabOrder(TabOrder.Structure);
//Create PdfTaggedContent
PdfTaggedContent taggedContent = new PdfTaggedContent(doc);
taggedContent.setLanguage("en-US");
taggedContent.setTitle("test");
//Set font
PdfTrueTypeFont font = new PdfTrueTypeFont(new Font("Times New Roman",Font.PLAIN,12), true);
PdfSolidBrush brush = new PdfSolidBrush(new PdfRGBColor(Color.black));
//Append elements
PdfStructureElement article = taggedContent.getStructureTreeRoot().appendChildElement(PdfStandardStructTypes.Document);
PdfStructureElement paragraph1 = article.appendChildElement(PdfStandardStructTypes.Paragraph);
PdfStructureElement span1 = paragraph1.appendChildElement(PdfStandardStructTypes.Span);
span1.beginMarkedContent(doc.getPages().get(0));
PdfStringFormat format = new PdfStringFormat(PdfTextAlignment.Justify);
doc.getPages().get(0).getCanvas().drawString("Spire.PDF for .NET is a professional PDF API applied to creating, writing, editing, handling and reading PDF files.",
font, brush, new Rectangle(40, 0, 480, 80), format);
span1.endMarkedContent(doc.getPages().get(0));
PdfStructureElement paragraph2 = article.appendChildElement(PdfStandardStructTypes.Paragraph);
paragraph2.beginMarkedContent(doc.getPages().get(0));
doc.getPages().get(0).getCanvas().drawString("Spire.PDF for .NET can be applied to easily convert Text, Image, SVG, HTML to PDF and convert PDF to Excel with C#/VB.NET in high quality.",
font, brush, new Rectangle(40, 80, 480, 60), format);
paragraph2.endMarkedContent(doc.getPages().get(0));
PdfStructureElement figure1 = article.appendChildElement(PdfStandardStructTypes.Figure);
//Set Alternate text
figure1.setAlt("replacement text1");
figure1.beginMarkedContent(doc.getPages().get(0), null);
PdfImage image = PdfImage.fromFile("E-logo.png");
Dimension2D dimension2D = new Dimension();
dimension2D.setSize( 100,100);
doc.getPages().get(0).getCanvas().drawImage(image, new Point2D.Float(40, 200),dimension2D);
figure1.endMarkedContent(doc.getPages().get(0));
PdfStructureElement figure2 = article.appendChildElement(PdfStandardStructTypes.Figure);
//Set Alternate text
figure2.setAlt( "replacement text2");
figure2.beginMarkedContent(doc.getPages().get(0), null);
doc.getPages().get(0).getCanvas().drawRectangle(PdfPens.getBlack(), new Rectangle(300, 200, 100, 100));
figure2.endMarkedContent(doc.getPages().get(0));

//Save to file
String result = "CreateTaggedFile_result.pdf";
doc.saveToFile(result);
doc.close();

sheet.Range["A1"].CurrentRegion;

Presentation ppt = new Presentation();
ppt.loadFromFile(inputFile);
for(int i=0;i<ppt.getSlides().getCount();i++)
{ ppt.getSlides().get(i).getSlideShowTransition().isAdvanceAfterTime(true);
//设置自动换片时间，isAdvanceAfterTime设置为TRUE才生效
ppt.getSlides().get(i).getSlideShowTransition().setAdvanceAfterTime(5000L);
}
ppt.saveToFile(outputFile,FileFormat.AUTO);

Presentation presentation1 =new Presentation();
presentation1.loadFromFile(inputFile_1);
Presentation presentation2 =new Presentation();
presentation2.loadFromFile(inputFile_2);
presentation1.isSlideSizeAutoFit(true);
ILayout layout = presentation1.getSlides().get(0).getLayout();
presentation1.getSlides().append(presentation2.getSlides().get(0),layout);
presentation1.saveToFile(outputFile, FileFormat.PPTX_2013);

ppt.isPasswordProtected(filepath)
ppt.isPasswordProtected(inputstream)

sheet.Range["A1"].CurrentRegion;

if (annotation is PdfLineAnnotationWidget)
{
    PdfLineAnnotationWidget lineAnn = annotation as PdfLineAnnotationWidget;
    //PdfLineAnnotation lineAnn = annotation as PdfLineAnnotation;
    lineAnn.Author = "Author_test";
    lineAnn.Subject = "Subject_test";
}

checkboxField.ForeColor = new PdfRGBColor(Color.Red);

PdfStringFormat format = new PdfStringFormat();
PdfTrueTypeFont font = new PdfTrueTypeFont(new System.Drawing.Font("Times New Roman", 10));
PdfPen pen = PdfPens.Black;
PdfSolidBrush brush = new PdfSolidBrush(Color.Black);

PdfDocument doc = new PdfDocument("HelloWord.pdf");
PdfLogicalStructure tree = PdfLogicalStructure.CreateLogicalStructure(doc);
PdfStructureElement article = tree.AppendChildElement(PdfStandardStructTypes.Article);
article.Title = "create tagged pdf";

PdfStructureElement paragraph1 = article.AppendChildElement(PdfStandardStructTypes.Paragraph);
paragraph1.Title = "text paragraph1";
int mcid = 0;
paragraph1.BeginMarkedContentSequence(doc.Pages[0].Canvas, "paragraph1", mcid);

doc.Pages[0].Canvas.DrawString("paragraph1: PDF’s logical structure facilities (PDF 1.3) provide a mechanism for " +
    "incorporating structural information about a document’s content into a PDF file. Such information might include, " +
    "for example, the organization of the document into chapters and sections or the identification of special elements " +
    "such as figures, tables, and footnotes. The logical structure facilities are extensible, allowing applications that " +
    "produce PDF files to choose what structural information to include and how to represent it, while enabling PDF " +
    "consumers to navigate a file without knowing the producer’s structural conventions.",
   font, pen, brush, new Rectangle(40, 200, 480, 80), format);
paragraph1.EndMarkedContentSequence(doc.Pages[0].Canvas);
paragraph1.ReferenceContent(doc.Pages[0], mcid);

PdfStructureElement paragraph2 = article.AppendChildElement(PdfStandardStructTypes.Paragraph);
paragraph2.Title = "text paragraph2";
mcid = 1;
paragraph2.BeginMarkedContentSequence(doc.Pages[0].Canvas, "paragraph2", mcid);
doc.Pages[0].Canvas.DrawString("paragraph2: PDF logical structure shares basic features with standard document markup languages" +
    " such as HTML, SGML, and XML. A document’s logical structure is expressed as a hierarchy of structure elements, each" +
    " represented by a dictionary object. Like their counterparts in other markup languages, PDF structure elements can" +
    " have content and attributes. In PDF, rendered document content takes over the role occupied by text in HTML, SGML, and XML.",
   font, pen, brush, new Rectangle(40, 280, 480, 60), format);
paragraph2.EndMarkedContentSequence(doc.Pages[0].Canvas);
paragraph2.ReferenceContent(doc.Pages[0], mcid);

doc.SaveToFile("Tagged.pdf");

Workbook book=new Workbook();
book.loadFromFile("test.xlsx");
//false--- export the hiden worksheets
//true--- not export the hiden worksheets
book.saveToHtml("output.html",false);