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並前往https://stackoverflow.com/questions/4660142/what-is-a-nullreferenceexception-and-how-do-i-fix-it

What is a NullReferenceException, and how do I fix it? - Stack ...

What is the cause? Bottom Line. You are trying to use something that is null (or Nothing in VB.NET). This means you either set it to null , or you never set ...

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