我们添加一个域然后使用Office录制宏代码：

Sub 宏1()
'
' 宏1 宏
'
'
    Selection.Fields.Add Range:=Selection.Range, Type:=wdFieldEmpty, Text:= _
        "PAGE  \* Arabic ", PreserveFormatting:=True
        
    Selection.Fields.Add Range:=Selection.Range, Type:=wdFieldEmpty, Text:= _
        "NUMPAGES  \# ""/0"" \* Arabic ", PreserveFormatting:=True
End Sub

然后我们在操作Office的时候也通过对应的Api来添加域:

  var pageSelection = centerRange.Application.Selection;
  var allPageSelection = centerRange.Application.Selection;
  centerRange.Fields.Add(pageSelection.Range, WdFieldType.wdFieldEmpty, @"PAGE  \* Arabic", true);
  centerRange.Fields.Add(allPageSelection.Range, WdFieldType.wdFieldEmpty, @"NUMPAGES  \# ""/0"" \* Arabic ", true);

在本地调试可以正常生成Office，但是上到服务器的时候，就报错此命令无效
然后通过查询最后将代码改成了这样

  object oMission = Missing.Value;
  Object currentPageFiled = WdFieldType.wdFieldPage;
   var selection = centerRange.Document.ActiveWindow.Selection;
  Object totalPageFiled = WdFieldType.wdFieldNumPages;
  centerRange.Document.ActiveWindow.Selection.TypeText(string.Empty);
 centerRange.Fields.Add(selection.Range, ref currentPageFiled, ref oMission, ref oMission);
 centerRange.Document.ActiveWindow.Selection.TypeText("/");
centerRange.Fields.Add(selection.Range, ref totalPageFiled, ref oMission, ref oMission);

然后服务端也就正常运行了，出现错误的原因，应该就是识别不了Add(）方法的Text传递的参数NUMPAGES # “”/0"" * Arabic ，也就是这段域代码。