public class ServiceDal : IServiceDal
{
public static readonly string Customers = ConfigurationManager.ConnectionStrings["Customers"].ToString();//获取配置文件中连接字符串版权声明：本文为zhaoxi2020原创文章，遵循CC 4.0 BY-SA版权协议，转载请附上原文出处链接和本声明。
public class ServiceDal : IServiceDal
{
public static readonly string Customers = ConfigurationManager.ConnectionStrings["Customers"].ToString();//获取配置文件中连接字符串