How to replace an Paragraph's text using OpenXML Sdk

Question

I am parsing some Openxml word documents using the .Net OpenXml SDK 2.0. I need to replace certain sentences with other sentences as part of the processing. While iterating over the paragraphs, I know when I've found something I need to replace, but I am stumped as to how I can replace it.

For example, lets say I need to replace the sentence "a contract exclusively for construction work that is not building work." with a html snippet to a Sharepoint Reusable content below.

<span class="ms-rtestate-read ms-reusableTextView" contentEditable="false" id="__publishingReusableFragment" fragmentid="/Sites/Sandbox/ReusableContent/132_.000" >a contract exclusively for construction work that is not building work.</span>

PS: I got the docx to Html conversion worked out using xslt, so that is kind of not a problem at this stage

The InnerText property of the Paragraph node gives me the proper text, but the inner text property itself is not settable. So Regex.Match(currentParagraph.InnerText, currentString).Success returns true and tells me that the current paragraph contains the text I want.

As I said, InnerText itself is not settable, so I tried created a new paragraph using outerxml is given below.

string modifiedOuterxml = Regex.Replace(currentParagraph.OuterXml, currentString, reusableContentString);
OpenXmlElement parent = currentParagraph.Parent;
Paragraph modifiedParagraph = new Paragraph(modifiedOuterxml);
parent.ReplaceChild<Paragraph>(modifiedParagraph, currentParagraph);

Even though I am not too concerned about the formatting at this level and it doesn't seem to have any, the outerXML seems to have extra elements that defeat the regex.

..."16" /><w:lang w:val="en-AU" /></w:rPr><w:t>a</w:t></w:r><w:proofErr w:type="gramEnd" /> <w:rw:rsidRPr="00C73B58"><w:rPr><w:sz w:val="16" /><w:szCs w:val="16" /><w:lang w:val="en-AU" /></w:rPr><w:t xml:space="preserve"> contract exclusively for construction work that is not building work.</w:t></w:r></w:p>

So in summary, how would I replace the text in a Paragraph of OpenXml with other text. Even at the expense of losing some of the formatting.

Answer 1

Fixed it myself. The key was to remove all the runs and create new runs in the current paragraph

string modifiedString = Regex.Replace(currentParagraph.InnerText, currentString, reusableContentString);
currentParagraph.RemoveAllChildren<Run>();
currentParagraph.AppendChild<Run>(new Run(new Text(modifiedString)));

Answer 2

All paragraphs have a text element inside so you just have to find the text element and update its text, for example:

var text = part.RootElement.Descendants<Text>().FirstOrDefault(e=>e.Text == "a contract exclusively for construction work that is not building work.");
if(text != null)
{
    text.Text = "New text here";
}
mainPart.Document.Save();