行号是文档或节级别的设置，并且受PageSetup对象的控制.要简单地在整个文档中将其关闭:

Line numbering is an document- or section-level setting, and it's controlled over the PageSetup object. To simply turn it off throughout the document:

Word.Document doc = wdApp.ActiveDocument;
doc.PageSetup.LineNumbering.Active = false;