Document doc = new Document();
//load .md file
doc.LoadFromFile("input.md");
//save to .md file
//doc.SaveToFile("output.md", Spire.Doc.FileFormat.Markdown);
//save to .docx file
//doc.SaveToFile("output.docx", Spire.Doc.FileFormat.Docx);
//save to .doc file
//doc.SaveToFile("output.doc", Spire.Doc.FileFormat.Doc);
//save to .pdf file
doc.SaveToFile("output.pdf", Spire.Doc.FileFormat.PDF);
doc.Close();

Document doc = new Document();
//load .docx file
doc.LoadFromFile("input.docx");
//load .doc file
//doc.LoadFromFile("input.doc");
//save to .md file
doc.SaveToFile("output.md", Spire.Doc.FileFormat.Markdown);
doc.Close();

PdfDocument pdf = new PdfDocument();
pdf.LoadFromFile(inputFile);
PdfPageBase page = pdf.Pages[0];
PdfTextFinder finds = new PdfTextFinder(page);
finds.Options.Parameter = TextFindParameter.None;
List<PdfTextFragment> result = finds.Find("hello");
StringBuilder str = new StringBuilder();
foreach (PdfTextFragment find in result)
{
	string text = find.LineText;
	string FontName = find.TextStates[0].FontName;
	float FontSize = find.TextStates[0].FontSize;
	string FontFamily = find.TextStates[0].FontFamily;
	bool IsBold = find.TextStates[0].IsBold;
	bool IsSimulateBold = find.TextStates[0].IsSimulateBold;
	bool IsItalic = find.TextStates[0].IsItalic;
	Color color = find.TextStates[0].ForegroundColor;
	str.AppendLine(text);
	str.AppendLine("FontName: " + FontName);
	str.AppendLine("FontSize: " + FontSize);
	str.AppendLine("FontFamily: " + FontFamily);
	str.AppendLine("IsBold: " + IsBold);
	str.AppendLine("IsSimulateBold: " + IsSimulateBold);
	str.AppendLine("IsItalic: " + IsItalic);
	str.AppendLine("color: " + color);
	str.AppendLine(" ");
}
PdfTextReplacer ptr = new PdfTextReplacer(page);
ptr.ReplaceAllText("hello", "New");
File.WriteAllText(outputFile_T, str.ToString());
pdf.SaveToFile(outputFile);
pdf.Dispose();

PdfDocument pdf = new PdfDocument();
pdf.LoadFromFile(inputFile);
pdf.RegisterProgressNotifier(new CustomProgressNotifier());
pdf.SaveToFile(outputFile, FileFormat.XPS);
pdf.Close();

public class CustomProgressNotifier :IProgressNotifier
{
	StringBuilder str = new StringBuilder();
	public void Notify(float progress)
	{
		str.AppendLine(progress + "%");
		File.WriteAllText(outputFile_txt, str.ToString());
	}
}

PdfDocument pdf = new PdfDocument();
pdf.LoadFromFile("test.pdf");
PdfTextFindOptions findOptions = new PdfTextFindOptions();
findOptions.Parameter = TextFindParameter.IgnoreCase;
foreach (PdfPageBase page in pdf.Pages)
{
  PdfTextFinder finder = new PdfTextFinder(page);
  finder.Options = findOptions;
  List results = finder.Find("total");
  foreach (PdfTextFragment text in results)
  {
	  String font=text.TextStates[0].FontName;
	  float size = text.TextStates[0].FontSize;
	  String fontF = text.TextStates[0].FontFamily;
  }
}

public enum InsertPlaceholderType
{
   Content = 0,
   VerticalContent = 1,
   Text = 2,
   VerticalText = 3,
   Picture = 4,
   Chart = 5,
   Table = 6,
   SmartArt = 7,
   Media = 8,
   OnlineImage = 9
}

presentation.Masters[0].Layouts[0].InsertPlaceholder(InsertPlaceholderType.Text, new RectangleF(20, 30, 400, 400));

Presentation ppt = new Presentation();
ppt.LoadFromFile(inputFile);
IChart chart = ppt.Slides[0].Shapes[9] as IChart;
ProjectionType type = chart.Series[0].ProjectionType;
chart.Series[0].ProjectionType = ProjectionType.Robinson;
ppt.SaveToFile(outputFile, FileFormat.Pptx2013);
ppt.Dispose();

Presentation ppt = new Presentation();
string latexMathCode = "x^{2}+\\sqrt{x^{2}+1=2}";
IAutoShape shape = ppt.Slides[0].Shapes.AppendShape(ShapeType.Rectangle, new RectangleF(30, 100, 400, 200));
shape.TextFrame.Paragraphs.Clear();
TextParagraph p = new TextParagraph();
p.ParagraphProperties.DefaultTextRangeProperties.Fill.FillType = FillFormatType.Solid;
p.ParagraphProperties.DefaultTextRangeProperties.Fill.SolidColor.Color = Color.Black;
shape.TextFrame.Paragraphs.Append(p);
TextRange portionEx = new TextRange("Hello World");
p.TextRanges.Append(portionEx);
p.AppendFromLatexMathCode(latexMathCode);
TextRange portionEx2 = new TextRange("My name is Tom.");
p.TextRanges.Append(portionEx2);
ppt.SaveToFile(outputFile, FileFormat.Auto);
ppt.Dispose();

presentation.Slides[0].Shapes.AddFromSVG(inputFile, new RectangleF(40, 40, 200, 200));