public static void ConvertNumPageFieldsToPageRef(Document doc)
{
// This is the prefix for each bookmark which signals where page numbering restarts.
// The underscore "_" at the start inserts this bookmark as hidden in MS Word.
const string bookmarkPrefix = "_SubDocumentEnd";
// Field name of the NUMPAGES field.
const string numPagesFieldName = "NUMPAGES";
// Field name of the PAGEREF field.
const string pageRefFieldName = "PAGEREF";
// Create a new DocumentBuilder which is used to insert the bookmarks and replacement fields.
DocumentBuilder builder = new DocumentBuilder(doc);
// Defines the number of page restarts that have been encountered and therefore the number of "sub" documents
// Found within this document.
int subDocumentCount = 0;
// Iterate through all sections in the document.
foreach (Section section in doc.Sections)
{
// This section has it's page numbering restarted so we will treat this as the start of a sub document.
// Any PAGENUM fields in this inner document must be converted to special PAGEREF fields to correct numbering.
if (section.PageSetup.RestartPageNumbering)
{
// Don't do anything if this is the first section in the document. This part of the code will insert the bookmark marking
// The end of the previous sub document so therefore it is not applicable for first section in the document.
if (!section.Equals(doc.FirstSection))
{
// Get the previous section and the last node within the body of that section.
Section prevSection = (Section)section.PreviousSibling;
Node lastNode = prevSection.Body.LastChild;
// Use the DocumentBuilder to move to this node and insert the bookmark there.
// This bookmark represents the end of the sub document.
builder.MoveTo(lastNode);
builder.StartBookmark(bookmarkPrefix + subDocumentCount);
builder.EndBookmark(bookmarkPrefix + subDocumentCount);
// Increase the subdocument count to insert the correct bookmarks.
subDocumentCount++;
}
}
// The last section simply needs the ending bookmark to signal that it is the end of the current sub document.
if (section.Equals(doc.LastSection))
{
// Insert the bookmark at the end of the body of the last section.
// Don't increase the count this time as we are just marking the end of the document.
Node lastNode = doc.LastSection.Body.LastChild;
builder.MoveTo(lastNode);
builder.StartBookmark(bookmarkPrefix + subDocumentCount);
builder.EndBookmark(bookmarkPrefix + subDocumentCount);
}
// Iterate through each NUMPAGES field in the section and replace the field with a PAGEREF field referring to the bookmark of the current subdocument
// This bookmark is positioned at the end of the sub document but does not exist yet. It is inserted when a section with restart page numbering or the last
// Section is encountered.
Node[] nodes = section.GetChildNodes(NodeType.FieldStart, true).ToArray();
foreach (FieldStart fieldStart in nodes)
{
if (fieldStart.FieldType == FieldType.FieldNumPages)
{
// Get the field code.
string fieldCode = GetFieldCode(fieldStart);
// Since the NUMPAGES field does not take any additional parameters we can assume the remaining part of the field
// Code after the fieldname are the switches. We will use these to help recreate the NUMPAGES field as a PAGEREF field.
string fieldSwitches = fieldCode.Replace(numPagesFieldName, "").Trim();
// Inserting the new field directly at the FieldStart node of the original field will cause the new field to
// Not pick up the formatting of the original field. To counter this insert the field just before the original field
Node previousNode = fieldStart.PreviousSibling;
// If a previous run cannot be found then we are forced to use the FieldStart node.
if (previousNode == null)
previousNode = fieldStart;
// Insert a PAGEREF field at the same position as the field.
builder.MoveTo(previousNode);
// This will insert a new field with a code like " PAGEREF _SubDocumentEnd0 *\MERGEFORMAT ".
Field newField = builder.InsertField(string.Format(" {0} {1}{2} {3} ", pageRefFieldName, bookmarkPrefix, subDocumentCount, fieldSwitches));
// The field will be inserted before the referenced node. Move the node before the field instead.
previousNode.ParentNode.InsertBefore(previousNode, newField.Start);
// Remove the original NUMPAGES field from the document.
RemoveField(fieldStart);
}
}
}
}
// ExEnd:ConvertNumPageFieldsToPageRef
