c# - Generating docx file from HTML file using OpenXML

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c# - Generating docx file from HTML file using OpenXML

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

I'm using this method for generating docx file:

public static void CreateDocument(string documentFileName, string text)
{
    using (WordprocessingDocument wordDoc =
        WordprocessingDocument.Create(documentFileName, WordprocessingDocumentType.Document))
    {
        MainDocumentPart mainPart = wordDoc.AddMainDocumentPart();

        string docXml =
                    @"<?xml version=""1.0"" encoding=""UTF-8"" standalone=""yes""?>
                 <w:document xmlns:w=""http://schemas.openxmlformats.org/wordprocessingml/2006/main"">
                 <w:body><w:p><w:r><w:t>#REPLACE#</w:t></w:r></w:p></w:body>
                 </w:document>";

        docXml = docXml.Replace("#REPLACE#", text);

        using (Stream stream = mainPart.GetStream())
        {
            byte[] buf = (new UTF8Encoding()).GetBytes(docXml);
            stream.Write(buf, 0, buf.Length);
        }
    }
}

It works like a charm:

CreateDocument("test.docx", "Hello");

But what if I want to put HTML content instead of Hello? for example:

CreateDocument("test.docx", @"<html><head></head>
                              <body>
                                    <h1>Hello</h1>
                              </body>
                        </html>");

Or something like this:

CreateDocument("test.docx", @"Hello<BR>
                                    This is a simple text<BR>
                                    Third paragraph<BR>
                                    Sign
                        ");

both cases creates an invalid structure for document.xml. Any idea? How can I generate a docx file from a HTML content?

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1 Answer

深蓝 · Answer 1 · 2021-10-23T19:30:51+0000

I realize I'm 7 years late to the game here. Still, for future people searching on how to convert from HTML to Word Doc, this blog posting on a Microsoft MSDN site gives most of the ingredients necessary to do this using OpenXML. I found the post itself to be confusing, but the source code that he included clarified it all for me.

The only piece that was missing was how to build a Docx file from scratch, instead of how to merge into an existing one as his example shows. I found that tidbit from here.

Unfortunately the project I used this in is written in vb.net. So I'm going to share the vb.net code first, then an automated c# conversion of it, that may or may not be accurate.

vb.net code:

Imports DocumentFormat.OpenXml
Imports DocumentFormat.OpenXml.Packaging
Imports DocumentFormat.OpenXml.Wordprocessing
Imports System.IO

Dim ms As IO.MemoryStream
Dim mainPart As MainDocumentPart
Dim b As Body
Dim d As Document
Dim chunk As AlternativeFormatImportPart
Dim altChunk As AltChunk

Const altChunkID As String = "AltChunkId1"

ms = New MemoryStream()

Using myDoc = WordprocessingDocument.Create(ms,WordprocessingDocumentType.Document)
    mainPart = myDoc.MainDocumentPart

    If mainPart Is Nothing Then
        mainPart = myDoc.AddMainDocumentPart()

        b = New Body()
        d = New Document(b)
        d.Save(mainPart)
    End If

    chunk = mainPart.AddAlternativeFormatImportPart(AlternativeFormatImportPartType.Xhtml, altChunkID)

    Using chunkStream As Stream = chunk.GetStream(FileMode.Create, FileAccess.Write)
        Using stringStream As StreamWriter = New StreamWriter(chunkStream)
            stringStream.Write("YOUR HTML HERE")
        End Using
    End Using

    altChunk = New AltChunk()
    altChunk.Id = altChunkID
    mainPart.Document.Body.InsertAt(Of AltChunk)(altChunk, 0)
    mainPart.Document.Save()
End Using

c# code:

using DocumentFormat.OpenXml;
using DocumentFormat.OpenXml.Packaging;
using DocumentFormat.OpenXml.Wordprocessing;
using System.IO;

IO.MemoryStream ms;
MainDocumentPart mainPart;
Body b;
Document d;
AlternativeFormatImportPart chunk;
AltChunk altChunk;

string altChunkID = "AltChunkId1";

ms = new MemoryStream();

Using (myDoc = WordprocessingDocument.Create(ms, WordprocessingDocumentType.Document))
{
    mainPart = myDoc.MainDocumentPart;

    if (mainPart == null) 
    {
         mainPart = myDoc.AddMainDocumentPart();
         b = new Body();
         d = new Document(b);
         d.Save(mainPart);
    }

    chunk = mainPart.AddAlternativeFormatImportPart(AlternativeFormatImportPartType.Xhtml, altChunkID);

    Using (Stream chunkStream = chunk.GetStream(FileMode.Create, FileAccess.Write)
    {
         Using (StreamWriter stringStream = new StreamWriter(chunkStream))         
         {
              stringStream.Write("YOUR HTML HERE");
         }
    }    

    altChunk = new AltChunk();
    altChunk.Id = altChunkID;
    mainPart.Document.Body.InsertAt(Of, AltChunk)[altChunk, 0];
    mainPart.Document.Save();
}

Note that I'm using the ms memory stream in another routine, which is where it's disposed of after use.

I hope this helps someone else!

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