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Add merge support for fields in headers #13

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Merged
chrisfcarroll merged 1 commit into from
May 22, 2025
Merged

Add merge support for fields in headers #13

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27 changes: 26 additions & 1 deletion MailMerge/MailMerger.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -202,13 +202,38 @@ internal void ApplyAllKnownMergeTransformationsToMainDocumentPart(Dictionary<str

xdoc.MergeSimpleMergeFields(fieldValues, Logger);
xdoc.MergeComplexMergeFields(fieldValues,Logger);
xdoc.MergeDateFields(Logger, DateTime, fieldValues.ContainsKey(DATEKey) ? fieldValues[DATEKey] : DateTime?.ToLongDateString());
var dateValueForMerge = fieldValues.ContainsKey(DATEKey) ? fieldValues[DATEKey] : DateTime?.ToLongDateString();
xdoc.MergeDateFields(Logger, DateTime, dateValueForMerge);

using (var wpDocx = WordprocessingDocument.Open(editableWPXmlStream, true))
{
var bodyNode = xdoc.SelectSingleNode("/w:document/w:body", OoXmlNamespace.Manager);
var documentBody = new Body(bodyNode.OuterXml);
wpDocx.MainDocumentPart.Document.Body = documentBody;

if (wpDocx.MainDocumentPart?.HeaderParts is not null)
{
foreach (var headerPart in wpDocx.MainDocumentPart.HeaderParts)
{
var headerXDoc = new XmlDocument(OoXmlNamespace.Manager.NameTable);

using (var partStream = headerPart.GetStream(FileMode.Open, FileAccess.Read))
{
headerXDoc.Load(partStream);
}

// Apply merge transformations
headerXDoc.MergeSimpleMergeFields(fieldValues, Logger);
headerXDoc.MergeComplexMergeFields(fieldValues, Logger);
headerXDoc.MergeDateFields(Logger, DateTime, dateValueForMerge);

// Save modified XML back to the header part
using (var partStream = headerPart.GetStream(FileMode.Create, FileAccess.Write))
{
headerXDoc.Save(partStream);
}
}
}
}
}

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