报错为 "Unable to cast object of type System.Windows.Forms.BindingSource to type System.Data.DataTable. "
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Unable to cast object of type System.Windows.Forms.BindingSource to type System.Data.DataTable
无法将System.Windows.Forms.BindingSource类型转换为System.Data.DataTable类型

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应是BindingSource.DataTable之 类！