as RyanDev [ ^ ]在问题的评论中提到，你必须调试你的程序。



我建议阅读：排除异常故障：System.FormatException [ ^ ]能够解决您的问题。

As RyanDev[^] mentioned in the comment to the question, you have to debug your programme.

I'd suggest to read this: Troubleshooting Exceptions: System.FormatException[^] to be able to resolve your issue.