How to replace text in a Word document with HTML?

3 mins read

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.

Create Console application in Visual Studio

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

Add DocIO 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;

Imports Syncfusion.DocIO
Imports Syncfusion.DocIO.DLS
Imports System.IO
Imports System.Text.RegularExpressions

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

//Open an existing word document 
using (WordDocument document = new WordDocument(@"Sample.docx"))
{
    //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(@"File.html");
         //Validate the HTML string.
         bool isValidHtml = htmlsection.Body.IsValidXHTML(htmlString, XHTMLValidationType.Transitional);
         //When the HTML string passes validation, it is inserted into 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);
    }
    //Save the Word document.
    document.Save("Result.docx", FormatType.Docx);
}

'Open an existing word document 
Using document As WordDocument = New WordDocument("Sample.docx")
    'Create the temporary word document for HTML.
    Using replaceDoc As WordDocument = New WordDocument()
        'Add section for HTML document. 
        Dim htmlsection As IWSection = replaceDoc.AddSection()
        'Read HTML string from the file.
        Dim htmlString = File.ReadAllText("File.html")
        'Validate the HTML string.
        Dim isValidHtml As Boolean = htmlsection.Body.IsValidXHTML(htmlString, XHTMLValidationType.Transitional)
        'When the HTML string passes validation, it is inserted into the document.
        If isValidHtml Then
            'Append HTML string in the temporary word document.
            htmlsection.Body.InsertXHTML(htmlString)
        End If
        'Replace the placeholder text with content of HTML document.
        document.Replace(New Regex("«([([a-zA-Z0-9 ]*:*[a-zA-Z0-9 ]+)»"), replaceDoc, True)
    End Using
    'Save the Word document.
    document.Save("Result.docx", FormatType.Docx)
End Using

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 in WinForms

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?

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

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