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The phenomenon and background of the problem

         AxisChange () reported an error a dozen hours after the program ran

code related to the problem

        this.Graph_Cavity1.AxisChange();

        this.Graph_Cavity1.Invalidate();

Running results and error contents

       System.NullReferenceException:"Object reference not set to an instance of an object"
Link
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  • Does this answer your question? [What is a NullReferenceException, and how do I fix it?](https://stackoverflow.com/questions/4660142/what-is-a-nullreferenceexception-and-how-do-i-fix-it) – gunr2171 Jan 10 '22 at 02:46

0 Answers0