<repositories>
    <repository>
        <id>com.e-iceblue</id>
        <name>e-iceblue</name>
        <url>https://repo.e-iceblue.cn/repository/maven-public/</url>
    </repository>
</repositories>
<dependencies>
    <dependency>
        <groupId>e-iceblue</groupId>
        <artifactId>spire.doc</artifactId>
        <version>13.12.2</version>
    </dependency>
</dependencies>

import com.spire.doc.*;
import com.spire.doc.documents.*;
import com.spire.doc.fields.*;

public class HideParagraph {
    public static void main(String[] args) {
        //创建document实例
        Document document = new Document();

        //加载示例Word文档
        document.loadFromFile("http://cdn.e-iceblue.cn/C:\\Users\\Administrator\\Desktop\\sample.docx");

        //获取第一节
        Section sec = document.getSections().get(0);

        //获取第一节中的第三段
        Paragraph para;
        para = sec.getParagraphs().get(2);

        //循环遍历段落的子对象
        for (Object docObj : para.getChildObjects()) {
            DocumentObject obj = (DocumentObject)docObj;

            //如果是子对象则将其转换为文本区域
            if ((obj instanceof TextRange)) {
                TextRange range = ((TextRange)(obj));

                //隐藏文本区域
                range.getCharacterFormat().setHidden(true);
            }
        }

        //将文档保存为新文件
        document.saveToFile("output/hideParagraph.docx", FileFormat.Docx_2013);
    }
}

PM> Install-Package Spire.XLS

using Spire.Xls;

namespace ExceltoOFD
{
    class Program
    {
        static void Main(string[] args)
        {
            //实例化Workbook类的对象
            Workbook workbook = new Workbook();

            //加载示例文档
            workbook.LoadFromFile("Sample.xlsx");

            //保存为OFD格式
            workbook.SaveToFile("toOFD.OFD", FileFormat.OFD);
         }
    }
}

Imports Spire.Xls

Namespace ExceltoOFD
    
    Class Program
        
        Private Shared Sub Main(ByVal args() As String)
            '新建Workbook实例
            Dim workbook As Workbook = New Workbook
            '加载示例文档
            workbook.LoadFromFile("Sample.xlsx")

            '保存为OFD格式
            workbook.SaveToFile("toOFD.OFD", FileFormat.OFD)
        End Sub
    End Class
End Namespace

PM> Install-Package Spire.Presentation 

using Spire.Presentation;
using Spire.Presentation.Drawing;
using System.Drawing;

namespace AddFormula
{
    class Program
    {
        static void Main(string[] args)
        {
            //定义LaTeX公式代码
            string latexCode1 = @"x^{2} + \sqrt{x^{2}+1}=2";
            string latexCode2 = @"F(x) &= \int^a_b \frac{1}{3}x^3";
            string latexCode3 = @"\alpha + \beta  \geq \gamma";
            string latexCode4 = @"\overrightarrow{abc}";
            string latexCode5 = @"\begin{bmatrix} 1 & 0 & \cdots & 0\\ 1 & 0 & \cdots & 0\\ \vdots & \vdots & \ddots & \vdots\\ 1 & 0 & 0 & 0 \end{bmatrix}";
            string latexCode6 = @"\log_a{b}";

            //创建Presentation类的实例
            Presentation ppt = new Presentation();

            //获取第一张幻灯片
            ISlide slide = ppt.Slides[0];

            //添加形状到幻灯片
            IAutoShape shape = slide.Shapes.AppendShape(ShapeType.Rectangle, new RectangleF(30, 100, 200, 30));
            shape.TextFrame.Paragraphs.Clear();
            //使用LaTeX代码添加数学公式到形状 
            shape.TextFrame.Paragraphs.AddParagraphFromLatexMathCode(latexCode1);

            //重复以上操作，添加形状，并添加公式到形状
            shape = slide.Shapes.AppendShape(ShapeType.Rectangle, new RectangleF(240, 100, 200, 40));
            shape.TextFrame.Paragraphs.Clear(); 
            shape.TextFrame.Paragraphs.AddParagraphFromLatexMathCode(latexCode2);

            shape = slide.Shapes.AppendShape(ShapeType.Rectangle, new RectangleF(30, 180, 200, 40));
            shape.TextFrame.Paragraphs.Clear();            
            shape.TextFrame.Paragraphs.AddParagraphFromLatexMathCode(latexCode3);

            shape = slide.Shapes.AppendShape(ShapeType.Rectangle, new RectangleF(240, 180, 200, 40));
            shape.TextFrame.Paragraphs.Clear();
            shape.TextFrame.Paragraphs.AddParagraphFromLatexMathCode(latexCode4);

            shape = slide.Shapes.AppendShape(ShapeType.Rectangle, new RectangleF(30, 280, 200, 70));
            shape.TextFrame.Paragraphs.Clear();
            shape.TextFrame.Paragraphs.AddParagraphFromLatexMathCode(latexCode5);

            shape = slide.Shapes.AppendShape(ShapeType.Rectangle, new RectangleF(240, 280, 200, 40));
            shape.TextFrame.Paragraphs.Clear();
            shape.TextFrame.Paragraphs.AddParagraphFromLatexMathCode(latexCode6);

            //设置形状边框和填充类型
            for (int i = 0; i < slide.Shapes.Count; i++)
            {
                slide.Shapes[i].Fill.FillType = FillFormatType.None;
                slide.Shapes[i].Line.FillType = FillFormatType.None;
            }

            //保存文档
            ppt.SaveToFile("MathEquations.pptx", FileFormat.Pptx2013);
        }
    }
}

Imports Spire.Presentation
Imports Spire.Presentation.Drawing
Imports System.Drawing

Namespace AddFormula
	Class Program
		Private Shared Sub Main(args As String())
			'定义LaTeX公式代码
			Dim latexCode1 As String = "x^{2} + \sqrt{x^{2}+1}=2"
			Dim latexCode2 As String = "F(x) &= \int^a_b \frac{1}{3}x^3"
			Dim latexCode3 As String = "\alpha + \beta  \geq \gamma"
			Dim latexCode4 As String = "\overrightarrow{abc}"
			Dim latexCode5 As String = "\begin{bmatrix} 1 & 0 & \cdots & 0\\ 1 & 0 & \cdots & 0\\ \vdots & \vdots & \ddots & \vdots\\ 1 & 0 & 0 & 0 \end{bmatrix}"
			Dim latexCode6 As String = "\log_a{b}"

			'创建Presentation类的实例
			Dim ppt As New Presentation()

			'获取第一张幻灯片
			Dim slide As ISlide = ppt.Slides(0)

			'添加形状到幻灯片
			Dim shape As IAutoShape = slide.Shapes.AppendShape(ShapeType.Rectangle, New RectangleF(30, 100, 200, 30))
			shape.TextFrame.Paragraphs.Clear()
			'使用LaTeX代码添加数学公式到形状 
			shape.TextFrame.Paragraphs.AddParagraphFromLatexMathCode(latexCode1)

			'重复以上操作，添加形状，并添加公式到形状
			shape = slide.Shapes.AppendShape(ShapeType.Rectangle, New RectangleF(240, 100, 200, 40))
			shape.TextFrame.Paragraphs.Clear()
			shape.TextFrame.Paragraphs.AddParagraphFromLatexMathCode(latexCode2)

			shape = slide.Shapes.AppendShape(ShapeType.Rectangle, New RectangleF(30, 180, 200, 40))
			shape.TextFrame.Paragraphs.Clear()
			shape.TextFrame.Paragraphs.AddParagraphFromLatexMathCode(latexCode3)

			shape = slide.Shapes.AppendShape(ShapeType.Rectangle, New RectangleF(240, 180, 200, 40))
			shape.TextFrame.Paragraphs.Clear()
			shape.TextFrame.Paragraphs.AddParagraphFromLatexMathCode(latexCode4)

			shape = slide.Shapes.AppendShape(ShapeType.Rectangle, New RectangleF(30, 280, 200, 70))
			shape.TextFrame.Paragraphs.Clear()
			shape.TextFrame.Paragraphs.AddParagraphFromLatexMathCode(latexCode5)

			shape = slide.Shapes.AppendShape(ShapeType.Rectangle, New RectangleF(240, 280, 200, 40))
			shape.TextFrame.Paragraphs.Clear()
			shape.TextFrame.Paragraphs.AddParagraphFromLatexMathCode(latexCode6)

			'设置形状边框和填充类型
			For i As Integer = 0 To slide.Shapes.Count - 1
				slide.Shapes(i).Fill.FillType = FillFormatType.None
				slide.Shapes(i).Line.FillType = FillFormatType.None
			Next

			'保存文档
			ppt.SaveToFile("MathEquations.pptx", FileFormat.Pptx2013)
		End Sub
	End Class
End Namespace

PM> Install-Package Spire.PDF

using Spire.Pdf.Conversion;

namespace ConvertPdfToGrayscale
{
    class Program
    {
        static void Main(string[] args)
        {
            //创建一个PdfGrayConverter实例并加载文档
            PdfGrayConverter converter = new PdfGrayConverter(@"Sample.pdf");
            //将彩色PDF转换为灰度
            converter.ToGrayPdf("Grayscale.pdf");
            converter.Dispose();
        }
    }
}
	

Imports Spire.Pdf.Conversion

Namespace ConvertPdfToGrayscale
    Friend Class Program
        Private Shared Sub Main(ByVal args As String())
            '创建一个PdfGrayConverter实例并加载文档
            Dim converter As PdfGrayConverter = New PdfGrayConverter("Sample.pdf")
            '将彩色PDF转换为灰度
            converter.ToGrayPdf("Grayscale.pdf")
            converter.Dispose()
        End Sub
    End Class
End Namespace