Find and highlight text in word document

VSTO
Spire.Doc
Download Sample Code

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Xml.Linq;
using Word = Microsoft.Office.Interop.Word;
using Office = Microsoft.Office.Core;
using Microsoft.Office.Tools.Word;
using System.Drawing;

namespace VSTO
{
    public partial class ThisAddIn
    {
        private void ThisAddIn_Startup(object sender, System.EventArgs e)
        {
            //Open document
            Word.Application wordApp = Application;
            wordApp.Documents.Open("../../Sample.docx");

            //Find text
            object findText = "Spire.Doc";

            //Highlight the text
            object highlightColor = Color.Yellow;
            this.Application.Selection.Find.HitHighlight(ref findText, ref highlightColor,
                ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing,
                ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing,
                ref missing, ref missing, ref missing);

            //Save the file
            this.Application.ActiveDocument.Save();
        }

        private void ThisAddIn_Shutdown(object sender, System.EventArgs e)
        {
        }

        #region VSTO generated code

        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InternalStartup()
        {
            this.Startup += new System.EventHandler(ThisAddIn_Startup);
            this.Shutdown += new System.EventHandler(ThisAddIn_Shutdown);
        }
        
        #endregion
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Spire.Doc;
using Spire.Doc.Documents;
using System.Drawing;

namespace Spire.Doc
{
    class Program
    {
        static void Main(string[] args)
        {
            //Load Document
            Document document = new Document();
            document.LoadFromFile("../../Sample.docx");

            //Find text
            TextSelection[] text = document.FindAllString("Spire.Doc", false, true);
            foreach (TextSelection seletion in text)
            {
                //Highlight text
                seletion.GetAsOneRange().CharacterFormat.HighlightColor = Color.Yellow;
            }

            //Save and Launch
            document.SaveToFile("FindHighlight.docx", FileFormat.Docx);
            System.Diagnostics.Process.Start("FindHighlight.docx");

        }
    }
}

FindAndHighlight.zip

Find and highlight text in word document

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