C# word 操作页脚书签

操作书签很好弄，但是操作页脚中的书签有点特殊

public String WriteFooter(MSWord.Application wordApp, String bookMark, String text)
        {
            object Bookmark = (int)MSWord.WdGoToItem.wdGoToBookmark;
            object NameBookMark = bookMark;
            wordApp.ActiveWindow.ActivePane.View.SeekView = WdSeekView.wdSeekCurrentPageFooter;
            wordApp.Selection.HeaderFooter.Range.Bookmarks.get_Item(ref NameBookMark).Select();
            wordApp.Selection.TypeText(text);
            wordApp.ActiveWindow.View.SeekView = WdSeekView.wdSeekMainDocument;
            return "true";
        }

其实就是先要进入页脚编辑，然后再写字！