RBMESAPICore/Context/ConnectionString.cs

namespace RB_MES_API.Context
{
    public class ConnectionString
    {
        private static readonly object objLock = new object();
        private static ConnectionString instance = null;
        IConfigurationRoot config = default;

        public ConnectionString()
        {
            ConfigurationBuilder configuration = new ConfigurationBuilder();
            //读取配置文件
            config = configuration.SetBasePath(Directory.GetCurrentDirectory()).AddJsonFile(file =>
            {
                file.Path = "/Config/appsettings.json";
                file.Optional = false;
                file.ReloadOnChange = true;

            }).Build();
        }

        public static ConnectionString GetInstance()
        {
            if (instance == null)
            {
                lock (objLock)
                {
                    if (instance == null)
                    {
                        instance = new ConnectionString();
                    }
                }
            }

            return instance;
        }

        public static string GetConfig(string section, string key)
        {
            //实例化KDContet

            //供ADO直接访问数据库的连接字符串
            return (string)GetInstance().config.GetSection(section).GetValue(typeof(string), key);
        }
    }
}