下面是从数据库中检索值的代码,但我的问题是它会抛出一个异常,指出“InvalidCastException未处理,指定的转换无效”。我现在困惑什么出了问题,代码和表格如下所示。 下面是代码: Public connstring As String = "Provider=Microsoft.ACE.OLEDB.12.0; Data Source =" & Application.StartupPa
The 'Microsoft.Jet.OLEDB.4.0' provider is not registered on the local machine. 描述: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for mo