Fill Picture content control in header of word doc using OpenXML - openxml

Question

I want to fill my Picture Content Control which is located in the header of my word document with this code: (I have passed content control tag and the image stream via document parameter to this function)
public void FillDocument(Stream stream, XDocument document)
{
using (WordprocessingDocument wordDocument =
WordprocessingDocument.Open(stream, true))
{
List<SdtElement> descendants = wordDocument.MainDocumentPart.Document.Descendants<SdtElement>().ToList();
foreach (var headerPart in wordDocument.MainDocumentPart.HeaderParts)
{
descendants.AddRange(headerPart.Header.Descendants<SdtElement>().ToList());
}
foreach (var footerPart in wordDocument.MainDocumentPart.FooterParts)
{
descendants.AddRange(footerPart.Footer.Descendants<SdtElement>().ToList());
}
XDocument doc = document;
foreach (SdtElement item in descendants)
{
SdtAlias alias = item.Descendants<SdtAlias>().FirstOrDefault();
if (alias != null)
{
string sdtTitle = alias.Val.Value;
//if Sdt Content Control is Picture
string imageContent = (from xElement in doc.Descendants("Picture") where xElement.Attribute("Id").Value == sdtTitle select xElement.Value).FirstOrDefault();
if (imageContent != null)
{
MemoryStream result = (MemoryStream)StringToStream(imageContent);
SdtProperties p = item.Elements<SdtProperties>().FirstOrDefault();
if (p != null)
{
// Is it a picture content control?
SdtContentPicture pict = p.Elements<SdtContentPicture>().FirstOrDefault();
// Get the alias.
SdtAlias a = p.Elements<SdtAlias>().FirstOrDefault();
if (pict != null && a.Val.Value == sdtTitle)
{
string embed = null;
Drawing dr = item.Descendants<Drawing>().FirstOrDefault();
if (dr != null)
{
D.Blip blip = dr.Descendants<D.Blip>().FirstOrDefault();
if (blip != null)
embed = blip.Embed;
if (embed != null)
{
IdPartPair idpp = wordDocument.MainDocumentPart.Parts
.Where(pa => pa.RelationshipId == embed).FirstOrDefault();
if (idpp != null)
{
ImagePart ip = (ImagePart)idpp.OpenXmlPart;
ip.FeedData(result);
}
}
}
}
}
continue;
}
}
}
It finds the content control in word document but in this line:
ImagePart ip = (ImagePart)idpp.OpenXmlPart;
I get this error:
Unable to cast object of type
‘DocumentFormat.OpenXml.Packaging.CustomXmlPart’ to type
‘DocumentFormat.OpenXml.Packaging.ImagePart’.
Could you please guide me?

Answer 1

I tried to find a way, here is the answer:
public void FillDocument(Stream stream, XDocument document)
{
using (WordprocessingDocument wordDocument =
WordprocessingDocument.Open(stream, true))
{
List<SdtElement> descendants = wordDocument.MainDocumentPart.Document.Descendants<SdtElement>().ToList();
foreach (HeaderPart headerPart in wordDocument.MainDocumentPart.HeaderParts)
{
descendants.AddRange(headerPart.Header.Descendants<SdtElement>().ToList());
}
foreach (var footerPart in wordDocument.MainDocumentPart.FooterParts)
{
descendants.AddRange(footerPart.Footer.Descendants<SdtElement>().ToList());
}
XDocument doc = document;
foreach (SdtElement item in descendants)
{
SdtAlias alias = item.Descendants<SdtAlias>().FirstOrDefault();
if (alias != null)
{
string sdtTitle = alias.Val.Value;
//if Sdt Content Control is Picture
string imageContent = (from xElement in doc.Descendants("Picture") where xElement.Attribute("Id").Value == sdtTitle select xElement.Value).FirstOrDefault();
if (imageContent != null)
{
MemoryStream result = (MemoryStream)StringToStream(imageContent);
D.Blip blipElement = item.Descendants<D.Blip>().FirstOrDefault();
string imageId = "default value";
if (blipElement != null)
{
imageId = blipElement.Embed.Value;
ImagePartType imagePartType = ImagePartType.Png;
//Add image and change embeded id.
ImagePart imagePart = null;
Type p = item.Parent.GetType();
switch (p.Name)
{
case "Header":
HeaderPart headerPart = ((Header)(item.Parent)).HeaderPart;
imagePart = headerPart.AddImagePart(imagePartType);
imagePart.FeedData(result);
blipElement.Embed = headerPart.GetIdOfPart(imagePart);
break;
case "Body":
MainDocumentPart mainDocumentPart = wordDocument.MainDocumentPart;
imagePart = mainDocumentPart.AddImagePart(imagePartType);
imagePart.FeedData(result);
blipElement.Embed = mainDocumentPart.GetIdOfPart(imagePart);
break;
case "Footer":
FooterPart footerPart = ((Footer)(item.Parent)).FooterPart;
imagePart = footerPart.AddImagePart(imagePartType);
imagePart.FeedData(result);
blipElement.Embed = footerPart.GetIdOfPart(imagePart);
break;
default:
break;
}
}
continue;
}
}
}
}}
It works fine and can fill the picture content control in header or footer or body!