I can reproduce the error "... there is a problem with the content" by using
an incomplete HTML document as the content of the alternative format import part.
For example if you use the following HTML snippet <h1>HELLO</h1>
MS Word is unable to open the document.
The code below shows how to add an AlternativeFormatImportPart to a word document.
(I've tested the code with MS Word 2013).
using (WordprocessingDocument doc = WordprocessingDocument.Open(@"test.docx", true))
{
string altChunkId = "myId";
MainDocumentPart mainDocPart = doc.MainDocumentPart;
var run = new Run(new Text("test"));
var p = new Paragraph(new ParagraphProperties(
new Justification() { Val = JustificationValues.Center }),
run);
var body = mainDocPart.Document.Body;
body.Append(p);
MemoryStream ms = new MemoryStream(Encoding.UTF8.GetBytes("<html><head></head><body><h1>HELLO</h1></body></html>"));
// Uncomment the following line to create an invalid word document.
// MemoryStream ms = new MemoryStream(Encoding.UTF8.GetBytes("<h1>HELLO</h1>"));
// Create alternative format import part.
AlternativeFormatImportPart formatImportPart =
mainDocPart.AddAlternativeFormatImportPart(
AlternativeFormatImportPartType.Html, altChunkId);
//ms.Seek(0, SeekOrigin.Begin);
// Feed HTML data into format import part (chunk).
formatImportPart.FeedData(ms);
AltChunk altChunk = new AltChunk();
altChunk.Id = altChunkId;
mainDocPart.Document.Body.Append(altChunk);
}
According to the Office OpenXML specification valid parent elements for the
w:altChunk element are body, comment, docPartBody, endnote, footnote, ftr, hdr and tc.
So, I've added the w:altChunk to the body element.
For more information on the w:altChunk element see this MSDN link.
EDIT
As pointed out by @user2945722, to make sure that the OpenXml library correctlty interprets the byte array as UTF-8, you should add the UTF-8 preamble. This can be done this way:
MemoryStream ms = new MemoryStream(new UTF8Encoding(true).GetPreamble().Concat(Encoding.UTF8.GetBytes(htmlEncodedString)).ToArray()
This will prevent your é's from being rendered as ??'s, your ?'s as ?¤'s, etc.
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