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原文：ExecuteScalar compilation error
原文：ExecuteScalar compilation error
I m在ExecuteScalar()上出现错误。 它说,我必须宣布微量变量@PicID。 我怎么能宣布可笑吗? 或者,我这样做是否不正确?
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vb.net - Object reference not set to an instance of Object
原文：vb.net - Object reference not set to an instance of object
原文：vb.net - Object reference not set to an instance of object
我在试图将参数用于我的ql发言时,就犯了这一错误,但是,如果使用的话,那就行得当。 我的法典如下:
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