Entity Framework Core 实现读写分离

        public SContext(MasterSlave masterSlave) : base(GetOptions(masterSlave))
        {
            // TODO: #639
            //ChangeTracker.QueryTrackingBehavior = QueryTrackingBehavior.NoTracking;
        }

        /// <summary>
        /// 主从关系
        /// </summary>
        /// <param name="writeRead"></param>
        /// <returns></returns>
        private static DbContextOptions<SContext> GetOptions(MasterSlave masterSlave)
        {
            var optionsBuilder = new DbContextOptionsBuilder<SContext>();
            if (masterSlave == MasterSlave.Slave)
            {
                optionsBuilder.UseSqlServer(Config.DbConfig.Read);
            }
            else
            {
                optionsBuilder.UseSqlServer(Config.DbConfig.Write);
            }
            return optionsBuilder.Options;
        }