I want to replace the placeholder 'plcDate' in the header of the doc. Headers start from 2nd page in my doc template.
I'm using the below code. But 'headDate' is always null.
Don't know whether I've to change the code or the doc template.
using (WordprocessingDocument theDoc = WordprocessingDocument.Open(NewPath, true))
{
MainDocumentPart mainPart = theDoc.MainDocumentPart;
foreach (HeaderPart hpart in mainPart.HeaderParts)
{
SdtElement headDate = hpart.Header.Descendants<SdtElement>().Where(r => r.SdtProperties.GetFirstChild<Tag>().Val == "plcDate").SingleOrDefault();
if (headDate != null)
{
headDate.Append(new DocumentFormat.OpenXml.Wordprocessing.Paragraph(new Run(new Text(dateValue))));
}
}
mainPart.Document.Save();
}
Worked after using the following code:
using (WordprocessingDocument theDoc = WordprocessingDocument.Open(NewPath, true))
{
MainDocumentPart mainPart = theDoc.MainDocumentPart;
string content = null;
using (StreamReader reader = new StreamReader(theDoc.MainDocumentPart.HeaderParts.First().GetStream()))
{
content = reader.ReadToEnd();
}
Regex exheadDate = new Regex("plcDate");
content = exheadDate.Replace(content, "27/07/1992");
using (StreamWriter writer = new StreamWriter(theDoc.MainDocumentPart.HeaderParts.First().GetStream(FileMode.Create)))
{
writer.Write(content);
}
mainPart.Document.Save();
}
Related
I have successfully done "find and replace" which created an xml. Now I want to convert the newly created xml file to pdf which will be attached as a file and sent in a mail.
The result of the Base64String was tested on a base64 pdf file converter but the pdf cannot be opened. Got this error: Something went wrong couldn't open the file
HOW CAN I MAKE THIS WORK?
public async Task<string> CreateDocument(string PolicyNumber)
{
var policy = await _context.Policy.SingleOrDefaultAsync(p => p.PolicyNumber == PolicyNumber);
ArgumentNullException.ThrowIfNull(policy, "Policy Not Available");
//CreatePolicyDocument
//create policy document
var files = #"C:\Users\PATHTODOCUMENT\holderTest.docx";
using (WordprocessingDocument wordDoc = WordprocessingDocument.Open(files, true))
{
string docText;
using (StreamReader sr = new StreamReader(wordDoc.MainDocumentPart.GetStream()))
{
docText = sr.ReadToEnd();
}
Regex regexText = new Regex("XCONCLUSION_DATEX");
var newWordText = regexText.Replace(docText, "Hi Everyone!");
using (StreamWriter sw = new StreamWriter(wordDoc.MainDocumentPart.GetStream(FileMode.Create)))
{
sw.Write(newWordText);
Encoding encoding = Encoding.UTF8;
byte[] docAsBytes = encoding.GetBytes(newWordText);
File.WriteAllBytes("hello.pdf", docAsBytes);
var file = Convert.ToBase64String(docAsBytes);
}
}
//send message
//
return "";
}
PDF file has its own construct,so you can't generate a pdf file with the contentstring of xml file dirctly.
If you really want to convert xml contentstring to PDF,you could try iTextSharp.
I tried with a simple demo,and here's the code:
[HttpPost]
public IActionResult XMLtoPDF([FromForm] Try T1)
{
var streamContent = new StreamContent(T1.file.OpenReadStream());
var filestring = streamContent.ReadAsStringAsync().Result;
MemoryStream outputStream = new MemoryStream();
Document doc = new Document();
PdfWriter writer = PdfWriter.GetInstance(doc, outputStream);
//PDF settings
PdfDestination pdfDest = new PdfDestination(PdfDestination.XYZ, 0, doc.PageSize.Height, 1f);
doc.Open();
var paragraph = new Paragraph(filestring);
doc.Add(paragraph);
doc.Close();
outputStream.Close();
var pdfArray = outputStream.ToArray();
return File(pdfArray, "application/pdf");
}
Result:
We are update document using openxml programatically. while we start to read file using below code, Exception throws at that time.
This exception only throws when file size is bigger.
using (WordprocessingDocument wdoc = WordprocessingDocument.Open(strPath, true))
using (WordprocessingDocument wordDoc = WordprocessingDocument.Open(m_fileName, true))
{
MainDocumentPart mainPart = wordDoc.MainDocumentPart;
foreach (CustomXmlPart customXmlPart in mainPart.CustomXmlParts)
{
bool exists = false;
using (XmlTextReader xReader = new XmlTextReader(customXmlPart.GetStream(FileMode.Open, FileAccess.Read)))
{
XmlDocument xmlDocument = new XmlDocument();
xReader.MoveToContent();
exists = xReader.NamespaceURI.Equals("urn:TTCProperties:namespace");
if (exists)
{
xmlDocument.Load(xReader);
XmlNodeList n = xmlDocument.GetElementsByTagName("Status");
if (n != null)
{
foreach (XmlNode curr in n)
{
Console.WriteLine(curr.InnerText);
curr.InnerText = "New String";
}
}
StreamReader sr = new StreamReader(customXmlPart.GetStream());
Stream stream = customXmlPart.GetStream();
stream.SetLength(0);
using (StreamWriter ts = new StreamWriter(stream))
ts.Write(xmlDocument.InnerXml);
wordDoc.MainDocumentPart.Document.Save(mainPart);
how can resolve this runtime Exception during file reading
I have around 10 word documents which I generate using open xml and other stuff.
Now I would like to create another word document and one by one I would like to join them into this newly created document.
I wish to use open xml, any hint would be appreciable.
Below is my code:
private void CreateSampleWordDocument()
{
//string sourceFile = Path.Combine("D:\\GeneralLetter.dot");
//string destinationFile = Path.Combine("D:\\New.doc");
string sourceFile = Path.Combine("D:\\GeneralWelcomeLetter.docx");
string destinationFile = Path.Combine("D:\\New.docx");
try
{
// Create a copy of the template file and open the copy
//File.Copy(sourceFile, destinationFile, true);
using (WordprocessingDocument document = WordprocessingDocument.Open(destinationFile, true))
{
// Change the document type to Document
document.ChangeDocumentType(DocumentFormat.OpenXml.WordprocessingDocumentType.Document);
//Get the Main Part of the document
MainDocumentPart mainPart = document.MainDocumentPart;
mainPart.Document.Save();
}
}
catch
{
}
}
Update( using AltChunks):
using (WordprocessingDocument myDoc = WordprocessingDocument.Open("D:\\Test.docx", true))
{
string altChunkId = "AltChunkId" + DateTime.Now.Ticks.ToString().Substring(0, 2) ;
MainDocumentPart mainPart = myDoc.MainDocumentPart;
AlternativeFormatImportPart chunk = mainPart.AddAlternativeFormatImportPart(
AlternativeFormatImportPartType.WordprocessingML, altChunkId);
using (FileStream fileStream = File.Open("D:\\Test1.docx", FileMode.Open))
chunk.FeedData(fileStream);
AltChunk altChunk = new AltChunk();
altChunk.Id = altChunkId;
mainPart.Document
.Body
.InsertAfter(altChunk, mainPart.Document.Body.Elements<Paragraph>().Last());
mainPart.Document.Save();
}
Why this code overwrites the content of the last file when I use multiple files?
Update 2:
using (WordprocessingDocument myDoc = WordprocessingDocument.Open("D:\\Test.docx", true))
{
MainDocumentPart mainPart = myDoc.MainDocumentPart;
string altChunkId = "AltChunkId" + DateTime.Now.Ticks.ToString().Substring(0, 3);
AlternativeFormatImportPart chunk = mainPart.AddAlternativeFormatImportPart(AlternativeFormatImportPartType.WordprocessingML, altChunkId);
using (FileStream fileStream = File.Open("d:\\Test1.docx", FileMode.Open))
{
chunk.FeedData(fileStream);
AltChunk altChunk = new AltChunk();
altChunk.Id = altChunkId;
mainPart.Document
.Body
.InsertAfter(altChunk, mainPart.Document.Body
.Elements<Paragraph>().Last());
mainPart.Document.Save();
}
using (FileStream fileStream = File.Open("d:\\Test2.docx", FileMode.Open))
{
chunk.FeedData(fileStream);
AltChunk altChunk = new AltChunk();
altChunk.Id = altChunkId;
mainPart.Document
.Body
.InsertAfter(altChunk, mainPart.Document.Body
.Elements<Paragraph>().Last());
}
using (FileStream fileStream = File.Open("d:\\Test3.docx", FileMode.Open))
{
chunk.FeedData(fileStream);
AltChunk altChunk = new AltChunk();
altChunk.Id = altChunkId;
mainPart.Document
.Body
.InsertAfter(altChunk, mainPart.Document.Body
.Elements<Paragraph>().Last());
}
}
This code is appending the Test2 data twice, in place of Test1 data as well.
Means I get:
Test
Test2
Test2
instead of :
Test
Test1
Test2
Using openXML SDK only, you can use AltChunk element to merge the multiple document into one.
This link the-easy-way-to-assemble-multiple-word-documents and this one How to Use altChunk for Document Assembly provide some samples.
EDIT 1
Based on your code that uses altchunk in the updated question (update#1), here is the VB.Net code I have tested and that works like a charm for me:
Using myDoc = DocumentFormat.OpenXml.Packaging.WordprocessingDocument.Open("D:\\Test.docx", True)
Dim altChunkId = "AltChunkId" + DateTime.Now.Ticks.ToString().Substring(0, 2)
Dim mainPart = myDoc.MainDocumentPart
Dim chunk = mainPart.AddAlternativeFormatImportPart(
DocumentFormat.OpenXml.Packaging.AlternativeFormatImportPartType.WordprocessingML, altChunkId)
Using fileStream As IO.FileStream = IO.File.Open("D:\\Test1.docx", IO.FileMode.Open)
chunk.FeedData(fileStream)
End Using
Dim altChunk = New DocumentFormat.OpenXml.Wordprocessing.AltChunk()
altChunk.Id = altChunkId
mainPart.Document.Body.InsertAfter(altChunk, mainPart.Document.Body.Elements(Of DocumentFormat.OpenXml.Wordprocessing.Paragraph).Last())
mainPart.Document.Save()
End Using
EDIT 2
The second issue (update#2)
This code is appending the Test2 data twice, in place of Test1 data as
well.
is related to altchunkid.
For each document you want to merge in the main document, you need to:
add an AlternativeFormatImportPart in the mainDocumentPart with an Id which must be unique. This element contains the inserted data
add in the body an Altchunk element in which you set the id to reference the previous AlternativeFormatImportPart.
In your code, you are using the same Id for all the AltChunks. It's why you see many time the same text.
I am not sure the altchunkid will be unique with your code: string altChunkId = "AltChunkId" + DateTime.Now.Ticks.ToString().Substring(0, 2);
If you don't need to set a specific value, I recommend you to not set explicitly the AltChunkId when you add the AlternativeFormatImportPart. Instead, you get the one generated by the SDK like this:
VB.Net
Dim chunk As AlternativeFormatImportPart = mainPart.AddAlternativeFormatImportPart(DocumentFormat.OpenXml.Packaging.AlternativeFormatImportPartType.WordprocessingML)
Dim altchunkid As String = mainPart.GetIdOfPart(chunk)
C#
AlternativeFormatImportPart chunk = mainPart.AddAlternativeFormatImportPart(DocumentFormat.OpenXml.Packaging.AlternativeFormatImportPartType.WordprocessingML);
string altchunkid = mainPart.GetIdOfPart(chunk);
There is a nice wrapper API (Document Builder 2.2) around open xml specially designed to merge documents, with flexibility of choosing the paragraphs to merge etc. You can download it from here (update: moved to github).
The documentation and screen casts on how to use it are here.
Update: Code Sample
var sources = new List<Source>();
//Document Streams (File Streams) of the documents to be merged.
foreach (var stream in documentstreams)
{
var tempms = new MemoryStream();
stream.CopyTo(tempms);
sources.Add(new Source(new WmlDocument(stream.Length.ToString(), tempms), true));
}
var mergedDoc = DocumentBuilder.BuildDocument(sources);
mergedDoc.SaveAs(#"C:\TargetFilePath");
Types Source and WmlDocument are from Document Builder API.
You can even add the file paths directly if you choose to as:
sources.Add(new Source(new WmlDocument(#"C:\FileToBeMerged1.docx"));
sources.Add(new Source(new WmlDocument(#"C:\FileToBeMerged2.docx"));
Found this Nice Comparison between AltChunk and Document Builder approaches to merge documents - helpful to choose based on ones requirements.
You can also use DocX library to merge documents but I prefer Document Builder over this for merging documents.
Hope this helps.
The only thing missing in these answers is the for loop.
For those who just want to copy / paste it:
void MergeInNewFile(string resultFile, IList<string> filenames)
{
using (WordprocessingDocument document = WordprocessingDocument.Create(resultFile, WordprocessingDocumentType.Document))
{
MainDocumentPart mainPart = document.AddMainDocumentPart();
mainPart.Document = new Document(new Body());
foreach (string filename in filenames)
{
AlternativeFormatImportPart chunk = mainPart.AddAlternativeFormatImportPart(AlternativeFormatImportPartType.WordprocessingML);
string altChunkId = mainPart.GetIdOfPart(chunk);
using (FileStream fileStream = File.Open(filename, FileMode.Open))
{
chunk.FeedData(fileStream);
}
AltChunk altChunk = new AltChunk { Id = altChunkId };
mainPart.Document.Body.AppendChild(altChunk);
}
mainPart.Document.Save();
}
}
All credits go to Chris and yonexbat
Easy to use in C#:
using System;
using System.IO;
using System.Linq;
using DocumentFormat.OpenXml.Packaging;
using DocumentFormat.OpenXml.Wordprocessing;
namespace WordMergeProject
{
public class Program
{
private static void Main(string[] args)
{
byte[] word1 = File.ReadAllBytes(#"..\..\word1.docx");
byte[] word2 = File.ReadAllBytes(#"..\..\word2.docx");
byte[] result = Merge(word1, word2);
File.WriteAllBytes(#"..\..\word3.docx", result);
}
private static byte[] Merge(byte[] dest, byte[] src)
{
string altChunkId = "AltChunkId" + DateTime.Now.Ticks.ToString();
var memoryStreamDest = new MemoryStream();
memoryStreamDest.Write(dest, 0, dest.Length);
memoryStreamDest.Seek(0, SeekOrigin.Begin);
var memoryStreamSrc = new MemoryStream(src);
using (WordprocessingDocument doc = WordprocessingDocument.Open(memoryStreamDest, true))
{
MainDocumentPart mainPart = doc.MainDocumentPart;
AlternativeFormatImportPart altPart =
mainPart.AddAlternativeFormatImportPart(AlternativeFormatImportPartType.WordprocessingML, altChunkId);
altPart.FeedData(memoryStreamSrc);
var altChunk = new AltChunk();
altChunk.Id = altChunkId;
OpenXmlElement lastElem = mainPart.Document.Body.Elements<AltChunk>().LastOrDefault();
if(lastElem == null)
{
lastElem = mainPart.Document.Body.Elements<Paragraph>().Last();
}
//Page Brake einfügen
Paragraph pageBreakP = new Paragraph();
Run pageBreakR = new Run();
Break pageBreakBr = new Break() { Type = BreakValues.Page };
pageBreakP.Append(pageBreakR);
pageBreakR.Append(pageBreakBr);
return memoryStreamDest.ToArray();
}
}
}
My solution :
using DocumentFormat.OpenXml;
using DocumentFormat.OpenXml.Packaging;
using DocumentFormat.OpenXml.Wordprocessing;
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Linq;
namespace TestFusionWord
{
internal class Program
{
public static void MergeDocx(List<string> ListPathFilesToMerge, string DestinationPathFile, bool OverWriteDestination, bool WithBreakPage)
{
#region Control arguments
List<string> ListError = new List<string>();
if (ListPathFilesToMerge == null || ListPathFilesToMerge.Count == 0)
{
ListError.Add("Il n'y a aucun fichier à fusionner dans la liste passée en paramètre ListPathFilesToMerge");
}
else
{
foreach (var item in ListPathFilesToMerge.Where(x => Path.GetExtension(x.ToLower()) != ".docx"))
{
ListError.Add(string.Format("Le fichier '{0}' indiqué dans la liste passée en paramètre ListPathFilesToMerge n'a pas l'extension .docx", item));
}
foreach (var item in ListPathFilesToMerge.Where(x => !File.Exists(x)))
{
ListError.Add(string.Format("Le fichier '{0}' indiqué dans la liste passée en paramètre ListPathFilesToMerge n'existe pas", item));
}
}
if (string.IsNullOrWhiteSpace(DestinationPathFile))
{
ListError.Add("Le fichier destination FinalPathFile passé en paramètre ne peut être vide");
}
else
{
if (Path.GetExtension(DestinationPathFile.ToLower()) != ".docx")
{
ListError.Add(string.Format("Le fichier destination '{0}' indiqué dans le paramètre DestinationPathFile n'a pas l'extension .docx", DestinationPathFile));
}
if (File.Exists(DestinationPathFile) && !OverWriteDestination)
{
ListError.Add(string.Format("Le fichier destination '{0}' existe déjà. Utilisez l'argument OverWriteDestination si vous souhaitez l'écraser", DestinationPathFile));
}
}
if (ListError.Any())
{
string MessageError = "Des erreurs ont été rencontrés, détail : " + Environment.NewLine + ListError.Select(x => "- " + x).Aggregate((x, y) => x + Environment.NewLine + y);
throw new ArgumentException(MessageError);
}
#endregion Control arguments
#region Merge Files
//Suppression du fichier destination (aucune erreur déclenchée si le fichier n'existe pas)
File.Delete(DestinationPathFile);
//Création du fichier destination à vide
using (WordprocessingDocument document = WordprocessingDocument.Create(DestinationPathFile, WordprocessingDocumentType.Document))
{
MainDocumentPart mainPart = document.AddMainDocumentPart();
mainPart.Document = new Document(new Body());
document.MainDocumentPart.Document.Save();
}
//Fusion des documents
using (WordprocessingDocument myDoc = WordprocessingDocument.Open(DestinationPathFile, true))
{
MainDocumentPart mainPart = myDoc.MainDocumentPart;
Body body = mainPart.Document.Body;
for (int i = 0; i < ListPathFilesToMerge.Count; i++)
{
string currentpathfile = ListPathFilesToMerge[i];
AlternativeFormatImportPart chunk = mainPart.AddAlternativeFormatImportPart(AlternativeFormatImportPartType.WordprocessingML);
string altchunkid = mainPart.GetIdOfPart(chunk);
using (FileStream fileStream = File.Open(currentpathfile, FileMode.Open))
chunk.FeedData(fileStream);
AltChunk altChunk = new AltChunk();
altChunk.Id = altchunkid;
OpenXmlElement last = body.Elements().LastOrDefault(e => e is AltChunk || e is Paragraph);
body.InsertAfter(altChunk, last);
if (WithBreakPage && i < ListPathFilesToMerge.Count - 1) // If its not the last file, add breakpage
{
last = body.Elements().LastOrDefault(e => e is AltChunk || e is Paragraph);
last.InsertAfterSelf(new Paragraph(new Run(new Break() { Type = BreakValues.Page })));
}
}
mainPart.Document.Save();
}
#endregion Merge Files
}
private static int Main(string[] args)
{
try
{
string DestinationPathFile = #"C:\temp\testfusion\docfinal.docx";
List<string> ListPathFilesToMerge = new List<string>()
{
#"C:\temp\testfusion\fichier1.docx",
#"C:\temp\testfusion\fichier2.docx",
#"C:\temp\testfusion\fichier3.docx"
};
ListPathFilesToMerge.Sort(); //Sort for always have the same file
MergeDocx(ListPathFilesToMerge, DestinationPathFile, true, true);
#if DEBUG
Process.Start(DestinationPathFile); //open file
#endif
return 0;
}
catch (Exception Ex)
{
Console.Error.WriteLine(Ex.Message);
//Log exception here
return -1;
}
}
}
}
I am creating a simple word doc, using the openXml SDK.
It is working so far.
Now how can I add an image from my file system to this doc? I don't care where it is in the doc just so it is there.
Thanks!
Here is what I have so far.
string fileName = "proposal"+dealerId +Guid.NewGuid().ToString()+".doc";
string filePath = #"C:\DWSApplicationFiles\Word\" + fileName;
using (WordprocessingDocument wordDoc = WordprocessingDocument.Create(filePath, WordprocessingDocumentType.Document, true))
{
MainDocumentPart mainPart = wordDoc.AddMainDocumentPart();
mainPart.Document = new Document();
//create the body
Body body = new Body();
DocumentFormat.OpenXml.Wordprocessing.Paragraph p = new DocumentFormat.OpenXml.Wordprocessing.Paragraph();
DocumentFormat.OpenXml.Wordprocessing.Run runParagraph = new DocumentFormat.OpenXml.Wordprocessing.Run();
DocumentFormat.OpenXml.Wordprocessing.Text text_paragraph = new DocumentFormat.OpenXml.Wordprocessing.Text("This is a test");
runParagraph.Append(text_paragraph);
p.Append(runParagraph);
body.Append(p);
mainPart.Document.Append(body);
mainPart.Document.Save();
}
Here is a method that can be simpler than the one described in the msdn page posted above, this code is in C++/CLI but of course you can write the equivalent in C#
WordprocessingDocument^ doc = WordprocessingDocument::Open(doc_name, true);
FileStream^ img_fs = gcnew FileStream(image_path, FileMode::Open);
ImagePart^ image_part = doc->MainDocumentPart->AddImagePart(ImagePartType::Jpeg);
image_part->FeedData(img_fs);
Run^ img_run = doc->MainDocumentPart->Document->Body->AppendChild(gcnew Paragraph())->AppendChild(gcnew Run());
Vml::ImageData^ img_data = img_run->AppendChild(gcnew Picture())->AppendChild(gcnew Vml::Shape())->AppendChild(gcnew Vml::ImageData());
img_data->RelationshipId = doc->MainDocumentPart->GetIdOfPart(image_part);
doc->Close();
This code worked for me: http://msdn.microsoft.com/en-us/library/bb497430.aspx
Your code adds image to your docx package, but in order to see it in the document you have to declare it in your document.xml i.e. link it to your physical image. That's why you have to write that long function listed in the msdn link.
My problem is how to add effects to pictures (editing, croping, background removal).
If you know how to do this I'd appreciate your help :)
How to: Add an Image Part to an Office Open XML Package by Using the Open XML API
http://msdn.microsoft.com/en-us/library/bb497430(v=office.12).aspx
public static void AddImagePart(string document, string fileName)
{
using (WordprocessingDocument wordDoc = WordprocessingDocument.Open(document, true))
{
MainDocumentPart mainPart = wordDoc.MainDocumentPart;
ImagePart imagePart = mainPart.AddImagePart(ImagePartType.Jpeg);
using (FileStream stream = new FileStream(fileName, FileMode.Open))
{
imagePart.FeedData(stream);
}
}
}
I need to do a simple search and replace of a string in a word document. I thought it would be pretty easy, but it's not (at least for me)
Check out this code (It takes a stream, opens the different part of the doc, searches for the string, and then it replaces it).
Problem is that only whats inside the MainDocumentPart and the FooterPart is saved. The HeaderPart is not saved. Strange...
public static void ProcessDocument(Dictionary<string, string> properties, Stream fs)
{
using (WordprocessingDocument doc = WordprocessingDocument.Open(fs, true))
{
string docText = null;
using (StreamReader sr = new StreamReader(doc.MainDocumentPart.GetStream()))
{
docText = sr.ReadToEnd();
}
docText = DoTheReplace(properties, docText);
using (StreamWriter sw = new StreamWriter(doc.MainDocumentPart.GetStream(FileMode.Create)))
{
sw.Write(docText);
}
foreach (FooterPart footer in doc.MainDocumentPart.FooterParts)
{
string footerText = null;
using (StreamReader sr = new StreamReader(footer.GetStream()))
{
footerText = sr.ReadToEnd();
}
footerText = DoTheReplace(properties, footerText);
using (StreamWriter sw = new StreamWriter(footer.GetStream(FileMode.Create)))
{
sw.Write(footerText);
}
}
foreach (HeaderPart header in doc.MainDocumentPart.HeaderParts)
{
string headerText = null;
using (StreamReader sr = new StreamReader(header.GetStream()))
{
headerText = sr.ReadToEnd();
}
headerText = DoTheReplace(properties, headerText);
using (StreamWriter sw = new StreamWriter(header.GetStream(FileMode.Create)))
{
sw.Write(headerText);
}
}
}
}
And yes if there are simpler ways of replacing a string in a word doc, please let me know.
Thanks for any help
Larsi
I ended up using DocX. It's a great lib, and has a simple Replace function.
http://docx.codeplex.com/
When you call GetStream() on the part, I believe it returns the entire XML structure of the part, not just the text area. And Microsoft Word sometimes splits words in strange places, so a string like
Hello World!
might look like
<w:p><w:r><w:t>Hel</w:t><w:t>lo </w:t><w:t>World!</w:t></w:r><w:p>
So if you're trying to replace "Hello", it might not find it using a simple search and replace. Maybe the text in your header part is split up in a strange way like that.
Like the "MainDocumentPart" has a method to save:
MainDocumentPart.Document.Save ();
You should also call the Save method for Header:
header.Header.Save ();
foreach (HeaderPart header in doc.MainDocumentPart.HeaderParts)
{
string headerText = null;
using (StreamReader sr = new StreamReader(header.GetStream()))
{
headerText = sr.ReadToEnd();
}
headerText = DoTheReplace(properties, headerText);
using (StreamWriter sw = new StreamWriter(header.GetStream(FileMode.Create)))
{
sw.Write(headerText);
}
//Save Header
header.Header.Save();
}