C# 使用Environment.TickCount 实现的时间限制器，限制一定时间内只能执行一次操作，避免频繁操作

        static TimeLimiter timeLimiter = new TimeLimiter();
        static void Test() {
            while (true) {
                Dosomething();
                Thread.Sleep(200);
            }
        }
        static void Dosomething() { 
            if (timeLimiter.Limiting("abc_123_@#$", 1000)) {
                return;
            }
            Console.WriteLine(DateTime.Now + " 执行具体业务");
        }

    /// <summary>
    /// 时间限制器,限制一定时间内只能执行一次操作
    /// </summary>
    public class TimeLimiter {
        readonly Dictionary<string, uint> dict = new Dictionary<string, uint>();
        uint prev;
        readonly object _lock = new object();
        /// <summary>
        /// 判断flag操作是否在milliseconds间隔限制内
        /// </summary>
        public bool Limiting(string flag, uint milliseconds) {
            uint tc = (uint)Environment.TickCount; //4294967295/1000/86400=49.71天后就会从0开始
            if (prev > tc) { //如果前一个值大于当前值，就说明从0开始了
                lock (_lock) {
                    if (prev > tc) {
                        dict.Clear(); //清空所有记录，避免永远处于限制状态
                    }
                }
            }
            prev = tc;
            if (!dict.ContainsKey(flag)) {
                dict.Add(flag, tc + milliseconds);
                return false;
            }
            if (tc < dict[flag]) { //当前时间未超过上次指定的限制时间就认为是限制中
                return true;
            }
            dict[flag] = tc + milliseconds;
            return false;
        }
    }