看看你是否在这个链接上有答案



http://forums.asp.net/t /1979251.aspx?Add+new+column+in+existing+CSV+file+using+C+ [ ^ ]



或者您可以使用代码项目文章



C＃CSV阅读器和作者 [ ^ ]

See whether You have the answer on this link

http://forums.asp.net/t/1979251.aspx?Add+new+column+in+existing+CSV+file+using+C+[^]

Or you can use code project article

C# CSV Reader and Writer[^]