How to replace text in a Word document with HTML in ASP.NET Core?

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Syncfusion Essential DocIO is a .NET Word library used to create, read, and edit Word documents programmatically without Microsoft Word or interop dependencies. Using this library, you can replace text in a Word document with HTML.

Steps to replace text in Word document with HTML using C#:

Create a new C# console application project.

Install the Syncfusion.DocIO.Net.Core NuGet package as a reference to your .NET Framework applications from NuGet.org.

Add DocIO.Net.Core NuGet package reference to the project

Include the following namespace in the Program.cs file:

using Syncfusion.DocIO;
using Syncfusion.DocIO.DLS;
using System.IO;
using System.Text.RegularExpressions;

Use the following code example to replace text in a Word document with HTML:

using (FileStream fileStream = new FileStream(Path.GetFullPath(@"../../../Data/Sample.docx"), FileMode.Open, FileAccess.ReadWrite)){
    //Open an existing Word document.
    using (WordDocument document = new WordDocument(fileStream, FormatType.Automatic))
    {
        //Replace the text by finding the word using ReGex.
        ReplaceTextUsingRegex(document);
        //Replace the text by finding the word using string.
        ReplaceTextUsingString(document);
        //Create file stream.
        using (FileStream outputFileStream = new FileStream(Path.GetFullPath(@"../../../Result.docx"), FileMode.Create, FileAccess.ReadWrite))
        {
            //Save the Word document to file stream.
            document.Save(outputFileStream, FormatType.Docx);
        }
    }
}

Use the following helper method to replace text in the Word document.

private static void ReplaceTextUsingString(WordDocument document){
    //Create the temporary word document for HTML.
    using (WordDocument replaceDoc = new WordDocument())
    {
        //Add section for HTML document.
        IWSection htmlsection = replaceDoc.AddSection();
        //Read HTML string from the file.
        string htmlString = File.ReadAllText(Path.GetFullPath(@"../../../Data/Keyword.html"));
        //Validate the HTML string.
        bool isValidHtml = htmlsection.Body.IsValidXHTML(htmlString, XHTMLValidationType.None);
        //When the HTML string passes validation, it is inserted to the document.
        if (isValidHtml)
        {
            //Append HTML string in the temporary word document.
            htmlsection.Body.InsertXHTML(htmlString);
        }
        //Replace the placeholder text with content of HTML document.
        document.Replace("<Keyword>", replaceDoc, true, true);
    }
}

private static void ReplaceTextUsingRegex(WordDocument document)
{
    //Create the temporary word document for HTML.
    using (WordDocument replaceDoc = new WordDocument())
    {
        //Add section for HTML document.
        IWSection htmlsection = replaceDoc.AddSection();
        //Read HTML string from the file.
        string htmlString = File.ReadAllText(Path.GetFullPath(@"../../../Data/File.html"));
        //Validate the HTML string.
        bool isValidHtml = htmlsection.Body.IsValidXHTML(htmlString, XHTMLValidationType.None);
        //When the HTML string passes validation, it is inserted to the document.
        if (isValidHtml)
        {
            //Append HTML string in the temporary word document.
            htmlsection.Body.InsertXHTML(htmlString);
        }
        //Replace the placeholder text with content of HTML document.
        document.Replace(new Regex("«([a-zA-Z0-9 ]*:*[a-zA-Z0-9 ]+)»"), replaceDoc, true);
    }
}

A complete working example to replace text in a Word document with HTML using C# can be downloaded from GitHub.

By executing the application, you will get the output Word document as follows:

Output Word document generated Take a moment to peruse this documentation. You can find basic Word document processing options along with features like mail merge, merge, and split documents, find and replace text in the Word document, protect the Word documents, and most importantly, PDF and Image conversions with code examples.

Explore more about the rich set of Syncfusion Word Framework features.

How to replace text in a Word document with HTML in ASP.NET Core?

Steps to replace text in Word document with HTML using C#:

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