XlsPivotTable pt = worksheet.PivotTables[0] as XlsPivotTable;
IPivotField field = pt.RowFields[0];
DateTime start = new DateTime(2024, 5, 6);
DateTime end = new DateTime(2024, 10, 6);
PivotGroupByTypes[] types = new PivotGroupByTypes[]{ PivotGroupByTypes.Days };
field.CreateGroup(start, end, types, 1);

Workbook workbook = new Workbook();
workbook.LoadFromFile(@"test.xlsx");
Worksheet sheet = workbook.Worksheets[0];
sheet.Range["A1"].FindAll()

foreach (XlsPivotTable pt in wb.Worksheets["PivotTable"].PivotTables)
 {
 pt.Options.RepeatAllItemLabels = true; 
 }

Presentation presentation = new Presentation();
presentation.LoadFromFile(inputFile);
IAutoShape shape = presentation.Slides[0].Shapes[0] as IAutoShape;
DefaultTextRangeProperties format = shape.TextFrame.Paragraphs[0].TextRanges[0].DisPlayFormat;
File.AppendAllText(outputFile, "text ：" + shape.TextFrame.Paragraphs[0].TextRanges[0].Text + "\r\n");
File.AppendAllText(outputFile, "is bold ：" + format.IsBold + "\r\n");
File.AppendAllText(outputFile, "is italic ：" + format.IsItalic + "\r\n");

Presentation ppt = new Presentation();
ppt.LoadFromFile(inputFile);
ppt.SaveToSvgOption.SaveUnderlineAsDecoration = true;
byte[] svgByte = ppt.Slides[0].Shapes[0].SaveAsSvgInSlide();
FileStream fs = new FileStream(outputFile + "1.svg", FileMode.Create);
fs.Write(svgByte, 0, svgByte.Length);
fs.Close();

Presentation presentation = new Presentation();
presentation.LoadFromFile(@"in.pptx");
bool showMasterShape = presentation.Slides[1].Layout.ShowMasterShapes;

private void Form1_Load(object sender, EventArgs e)
   {
	  this.pdfDocumentViewer1.LoadFromFile("1.pdf");
	  this.pdfDocumentViewer1.MouseDown += new MouseEventHandler(PV_Click);
	}

	private void PV_Click(object sender, MouseEventArgs e)
	{
		string outputFile = "out.Pdf";
		string outputFile_TXT = "out.txt";
		File.Delete(outputFile_TXT);           
	   if (e.Button == MouseButtons.Left) 
	   {
			PointF[] controlPositions = new PointF[] { e.Location};
			Spire.PdfViewer.Forms.PagePosition[] pagePositions = this.pdfDocumentViewer1.ControlToPage(controlPositions);                
string fileName = this.pdfDocumentViewer1.FileName;
			PdfDocument doc = new PdfDocument();
			doc.LoadFromFile(fileName,FileFormat.PDF);                
PdfPageBase page = doc.Pages[pagePositions[0].PageIndex];
		  
			RectangleF bounds = new RectangleF(pagePositions[0].Position, new SizeF(100, 100));            
			PdfTextExtractor textExtractor = new PdfTextExtractor(page);
			PdfTextExtractOptions option = new PdfTextExtractOptions();
			option.ExtractArea = bounds;
			string text = textExtractor.ExtractText(option);         
			PdfFont font = new PdfFont(PdfFontFamily.Helvetica, 11);
			PdfTextWidget pdfTextbox = new PdfTextWidget();
			pdfTextbox.Font = font;
			pdfTextbox.Brush = PdfBrushes.Red;
			pdfTextbox.Text = "stamp";                
pdfTextbox.Draw(page, bounds);                
doc.Pages[pagePositions[0].PageIndex].Canvas.DrawRectangle(PdfPens.Red, bounds);
			doc.SaveToFile(outputFile);               
File.AppendAllText(outputFile_TXT, "Position: " + pagePositions[0].Position.ToString() + "\ntext:\r\n " + text);                
MessageBox.Show("finish");               
doc.Dispose();
		}
	}