//动态链接库中ClsPublic类有一变量 private static string key="1111";
    //下面通过反射的技术修改和获取值
    //设置key 
        public static void updatePalmKey(string key = "test")
        {
            BindingFlags flag = BindingFlags.Static | BindingFlags.NonPublic;
            FieldInfo f_key = typeof(ClsPublic).GetField("key", flag);
            f_key.SetValue(new ClsPublic(), key);
        }

        /// <summary>
        /// 获取key
        /// </summary>
        /// <returns></returns>
        public static string getPalmKey()
        {
            BindingFlags flag = BindingFlags.Static | BindingFlags.NonPublic;
            FieldInfo f_key = typeof(ClsPublic).GetField("key", flag);
            object o = f_key.GetValue(new ClsPublic());
            return o.ToString();
        }