Unable to use existing paragraph styles in Open Xml

Question

I\'m working on an export of an HTML file to a Open XML wordfile. If in the HTML

is used, I want to add a Heading1 style to that part. But somehow wh

Answer 1

Unfortunately this happens because the Style is not written to the document by default (even though it is "built-in" to Word) therefore the style is not applied.

If you create a document via your code and then another via Word with the Heading1 style applied then compare the XML in \word\styles.xml you will see there is an additional section in the Word generated XML:

You can generate your own style information using the following code. I don't know of a way to grab these styles from somewhere other than hardcoding; perhaps they could be found in a dotx file somewhere? See edit below for more on this

using (WordprocessingDocument wordDocument = WordprocessingDocument.Open(documentStream, true))
{
    MainDocumentPart mainPart = wordDocument.MainDocumentPart;
    Body body = wordDocument.MainDocumentPart.Document.Body;
    Paragraph para = body.AppendChild(new Paragraph());
    StyleDefinitionsPart part = wordDocument.MainDocumentPart.StyleDefinitionsPart;
    if (part != null)
    {
        Style style = new Style()
        {
            Type = StyleValues.Paragraph,
            StyleId = "Heading1",
            BasedOn = new BasedOn() { Val = "Normal" },
            NextParagraphStyle = new NextParagraphStyle() { Val = "Normal" }
        };

        StyleName styleName1 = new StyleName() { Val = "heading 1" };
        style.Append(styleName1);
        style.Append(new PrimaryStyle());
        StyleRunProperties styleRunProperties1 = new StyleRunProperties();
        styleRunProperties1.Append(new Bold());
        styleRunProperties1.Append(new RunFonts() 
            {
                ComplexScriptTheme=ThemeFontValues.MajorBidi, 
                HighAnsiTheme=ThemeFontValues.MajorHighAnsi,
                EastAsiaTheme=ThemeFontValues.MajorEastAsia, 
                AsciiTheme=ThemeFontValues.MajorAscii 
            });
        styleRunProperties1.Append(new FontSize() { Val = "28" });
        styleRunProperties1.Color = new Color() 
            {
                Val = "365F91",
                ThemeShade = "BF",
                ThemeColor = ThemeColorValues.Accent1
            };
        style.Append(styleRunProperties1);
        part.Styles.Append(style);

        ParagraphProperties pPr = new ParagraphProperties();
        ParagraphStyleId paragraphStyleId1 = new ParagraphStyleId() { Val = "Heading1" };
        pPr.Append(paragraphStyleId1);
        para.Append(pPr);
    }

    Run run = para.AppendChild(new Run());
    run.AppendChild(new Text("This is a heading"));
}

Edit

I had a look at this and found that the Word default styles are indeed stored in .dotx files as I guessed above. Those files are readable via the OpenXML API as well so it's possible to copy the styles from there into your document. The code for this is very similar to the code we already have with the addition of reading the Default.dotx file and grabbing the styles from there.

On my system the dotx files are in C:\Program Files\Microsoft Office\Office14\1033\QuickStyles which I've hard coded below. I don't know if there is somewhere this can be picked up dynamically (the registry perhaps) but if not I guess a config file will have to suffice.

using (WordprocessingDocument wordDocument = WordprocessingDocument.Open(documentStream, true))
{
    MainDocumentPart mainPart = wordDocument.MainDocumentPart;
    Body body = wordDocument.MainDocumentPart.Document.Body;
    Paragraph para = body.AppendChild(new Paragraph());
    Paragraph para2 = body.AppendChild(new Paragraph());
    Paragraph para3 = body.AppendChild(new Paragraph());

    StyleDefinitionsPart part = wordDocument.MainDocumentPart.StyleDefinitionsPart;
    if (part != null)
    {
        //I'm looping the styles and adding them here
        //you could clone the whole StyleDefinitionsPart
        //but then you'd lose custom styles in your source doc
        using (WordprocessingDocument wordTemplate = WordprocessingDocument.Open(@"C:\Program Files\Microsoft Office\Office14\1033\QuickStyles\default.dotx", false))
        {
            foreach (var templateStyle in wordTemplate.MainDocumentPart.StyleDefinitionsPart.Styles)
            {
                part.Styles.Append(templateStyle.CloneNode(true));
            }
        }

        //I can now use any built in style 
        //I'm using Heading1, Title and IntenseQuote as examples
        //You may need to do a language conversion here as 
        //you mentione your docx is in Dutch
        ParagraphProperties pPr = new ParagraphProperties();
        ParagraphStyleId paragraphStyleId1 = new ParagraphStyleId() { Val = "Heading1" };
        pPr.Append(paragraphStyleId1);
        para.Append(pPr);

        Run run = para.AppendChild(new Run());
        run.AppendChild(new Text("This is a heading"));

        ParagraphProperties pPr2 = new ParagraphProperties();
        ParagraphStyleId paragraphStyleId2 = new ParagraphStyleId() { Val = "Title" };
        pPr2.Append(paragraphStyleId2);
        para2.Append(pPr2);

        Run run2 = para2.AppendChild(new Run());
        run2.AppendChild(new Text("This is a title"));

        ParagraphProperties pPr3 = new ParagraphProperties();
        ParagraphStyleId paragraphStyleId3 = new ParagraphStyleId() { Val = "IntenseQuote" };
        pPr3.Append(paragraphStyleId3);
        para3.Append(pPr3);

        Run run3 = para3.AppendChild(new Run());
        run3.AppendChild(new Text("This is an intense quote"));
    }
}

The file this produces looks like this: