问题
While Word and PowerPoint both use OpenXML, newlines are handled differently. In Word/WordprocessingML you can run.Append(new Break()) (see here) to insert a newline. Unfortunately in PresentationML this leads to a nonvalid presentation and with errors when loading it in PowerPoint.
How to add a newline in the TextBody of a PowerPoint Shape?
回答1:
The Open XML Productivity Tool of Open Office SDK 2.5 has this great Reflect Code tool to get C# code of whatever OpenXML file you have. But especially after much editing, the text in a presentation gets splitted in various Run elements and the reflect code isn't very compact. Here's an example of a TextBody of a Shape.
new TextBody(
new A.BodyProperties(),
new A.Paragraph(
new A.Run( new A.Text("first line") ),
new A.Break(),
new A.Run( new A.Text("second line") )
),
new A.Paragraph(
new A.Run( new A.Text("new paragraph") )
)
)
Note, the Break is child of the Paragraph, not child of a Run (as it is in WordprocessingML).
Note, that the Break makes a newline (Shift-Return in PowerPoint), if you want a new paragraph (Return in PowerPoint), you'll need a new Paragraph.
来源：https://stackoverflow.com/questions/32631028/how-to-insert-a-newline-in-powerpoint-pptx-in-openxml-presentationml-c-sha