object objIndex = "附件";
Microsoft.Office.Interop.Word.Range rangeAttachment = _WordDoc.Bookmarks.get_Item(ref objIndex).Range;
object ClassType = objNull;
object FileName = attachmentPathFileName;
object LinkToFile = true;
object DisplayAsIcon = true;
object IconFileName = attachmentPathFileName;
object IconIndex = 0;
object IconLabel = "附件名称【点击查看"
object Range = objNull;
rangeAttachment.InlineShapes.AddOLEObject(
ref ClassType, ref FileName, ref LinkToFile, ref DisplayAsIcon,
ref IconFileName, ref IconIndex, ref IconLabel, ref Range);
_WordDoc.Save();