解决：Access denied for user ''@'sinochip-79e833' (using password: NO)

uthentication to host '' for user '' using method 'mysql_native_password' failed with message: Access denied for user ''@'sinochip-79e833' (using password: NO)

解决方法：更新下web.config，内容：

<connectionStrings>
        <add name="rootkey" connectionString="XX供电公司" />
        <!--<add name="Mysql"  connectionString="server=localhost; userid=root; password=zhangwei; database=ipman" />-->
    </connectionStrings>
    <appSettings>
        <add key="Mysql"  value="server=192.168.1.223; userid=root; password=youotech; database=ipmanage_zw" />

原因：因为我把数据库连接字符串放到了appsettings了，之前一直在connectionStrings里面，所以数据库访问找不到连接字符串，真是草泥马的问题。