C# Microsoft.Office.Interop.Word设置Word页脚之添加当前页数

用C#操作Word，电脑上原生的库为Microsoft.Office.Interop.Word，虽然有些慢，但也能用。操作word的另外一个库是Spire.Doc，但是商业的，破解版也不好搞，还是凑合用Microsoft.Office.Interop.Word吧。
现在需要根据Word模板生成受控报告，主要借助word标签实现该功能。但现在有一个需求，就是需要添加如下格式的页脚：

第   页 共   页
PAGE_OF_
1
2

涉及到获取当前页面的页码。查了好多帖子，最后等外网找到了解决方案，那就直接放代码：

        //设置页脚
        /*          第   页 共   页
        *               PAGE_OF_
        */               
        void setFooter(ref Word.Application app)
        {
            object missing = System.Reflection.Missing.Value;

            app.ActiveWindow.ActivePane.View.SeekView = Microsoft.Office.Interop.Word.WdSeekView.wdSeekCurrentPageFooter;
            app.ActiveWindow.ActivePane.Selection.Paragraphs.Alignment = Microsoft.Office.Interop.Word.WdParagraphAlignment.wdAlignParagraphCenter;
            app.ActiveWindow.Selection.TypeText("第");
            Object CurrentPage = Word.WdFieldType.wdFieldPage;
            app.ActiveWindow.Selection.Fields.Add(app.ActiveWindow.Selection.Range, ref CurrentPage, ref missing, ref missing);
            app.ActiveWindow.Selection.TypeText("页 共");            
            Object TotalPages = Word.WdFieldType.wdFieldNumPages;
            app.ActiveWindow.Selection.Fields.Add(app.ActiveWindow.Selection.Range, ref TotalPages, ref missing, ref missing);
            app.ActiveWindow.Selection.TypeText("页\n");

            /*     Insert current page number "Page X of N" on a word document      */
            /*======================================================================*/
            // Open up the footer in the word document
            app.ActiveWindow.ActivePane.View.SeekView = Microsoft.Office.Interop.Word.WdSeekView.wdSeekCurrentPageFooter;
            // Set current Paragraph Alignment to Center
            app.ActiveWindow.ActivePane.Selection.Paragraphs.Alignment = Microsoft.Office.Interop.Word.WdParagraphAlignment.wdAlignParagraphCenter;
            // Type in 'Page '
            app.ActiveWindow.Selection.TypeText("PAGE");
            // Add in current page field
            CurrentPage = Word.WdFieldType.wdFieldPage;
            app.ActiveWindow.Selection.Fields.Add(app.ActiveWindow.Selection.Range, ref CurrentPage, ref missing, ref missing);
            // Type in ' of '
            app.ActiveWindow.Selection.TypeText("OF");
            // Add in total page field
            TotalPages = Word.WdFieldType.wdFieldNumPages;
            app.ActiveWindow.Selection.Fields.Add(app.ActiveWindow.Selection.Range, ref TotalPages, ref missing, ref missing);
            /*======================================================================*/

        }
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自此声明：上面代码用到的库为Microsoft.Office.Interop.Word。