方法里获取外界变量名和值;

        public static int _成功订单个数 = 111;
        private void test(Expression<Func<int,int>> exp)
        {
            //这里可以获取_成功订单个数的值111吗?
            var body = exp.Body as MemberExpression;
            Console.WriteLine("参数名：" + body.Member.Name);//_成功订单个数
            Console.WriteLine("参数值:" + exp.Compile()(0));//111
        }

        private void buttonLogin_Click(object sender, EventArgs e)
        {
            test(p=>_成功订单个数);
        }