using Spire.Doc;
using Spire.Doc.Interface;
namespace ReplaceTextWithDocument_Doc
{
    class Program
    {
        static void Main(string[] args)
        {
            //加载源文档
            Document document = new Document("Original.docx");
            //加载用于替换的文档
            IDocument replaceDocument = new Document("test.docx");
            //用文档替换源文档中的指定文本
            document.Replace("History", replaceDocument, false, true);
            //保存文档
            document.SaveToFile("result.docx", FileFormat.Docx2013);
            System.Diagnostics.Process.Start("result.docx");
        }
    }
}

using Spire.Doc;
using Spire.Doc.Documents;
using Spire.Doc.Fields;
using System.Drawing;
namespace ReplaceTextWithImg_Doc
{
    class Program
    {
        static void Main(string[] args)
        {
            //实例化Document类的对象，并加载测试文档
            Document doc = new Document();
            doc.LoadFromFile("testfile.docx");
            //加载替换的图片
            Image image = Image.FromFile("g.png");
            //获取第一个section
            Section sec= doc.Sections[0];
            //查找文档中的指定文本内容
            TextSelection[] selections = doc.FindAllString("Google", true, true);
            int index = 0;
            TextRange range = null;
            //遍历文档，移除文本内容，插入图片
            foreach (TextSelection selection in selections)
            {
                DocPicture pic = new DocPicture(doc);
                pic.LoadImage(image);
                range = selection.GetAsOneRange();
                index = range.OwnerParagraph.ChildObjects.IndexOf(range);
                range.OwnerParagraph.ChildObjects.Insert(index, pic);
                range.OwnerParagraph.ChildObjects.Remove(range);
            }
            //保存文档
            doc.SaveToFile("result.docx", FileFormat.Docx);
            System.Diagnostics.Process.Start("result.docx");
        }
    }
}

using Spire.Doc;
using Spire.Doc.Documents;
using Spire.Doc.Fields;
namespace ReplaceTextWithTable_Doc
{
    class Program
    {
        static void Main(string[] args)
        {
            //实例化Document类的对象，并加载测试文档
            Document doc = new Document();
            doc.LoadFromFile("test.docx");
            //查找关键字符串文本
            Section section = doc.Sections[0];
            TextSelection selection = doc.FindString("参考附录", true, true);
            //获取关键字符串所在的段落
            TextRange range = selection.GetAsOneRange();
            Paragraph paragraph = range.OwnerParagraph;
            Body body = paragraph.OwnerTextBody;
            int index = body.ChildObjects.IndexOf(paragraph);
            //添加一个两行三列的表格
            Table table = section.AddTable(true);
            table.ResetCells(2, 3);
            range = table[0, 0].AddParagraph().AppendText("管号（McFarland）");
            range = table[0, 1].AddParagraph().AppendText("0.5");
            range = table[0, 2].AddParagraph().AppendText("1");
            range = table[1, 0].AddParagraph().AppendText("0.25%BaCl2(ml)");
            range = table[1, 1].AddParagraph().AppendText("0.2");
            range = table[1, 2].AddParagraph().AppendText("0.4");
            //移除段落，插入表格 
            body.ChildObjects.Remove(paragraph);
            body.ChildObjects.Insert(index, table);
            //保存文档
            doc.SaveToFile("result.doc", FileFormat.Doc);
            System.Diagnostics.Process.Start("result.doc");
             
        }
    }
}