https://www.cnblogs.com/yinmu/p/11228196.html

第一种：

        /// <summary>/// 获取时间戳/// </summary>/// <returns></returns>public string GetTimeStamp(){TimeSpan ts = DateTime.Now - new DateTime(1970, 1, 1, 0, 0, 0, 0);return Convert.ToInt64(ts.TotalSeconds).ToString();}        

　　

　　第二种：

　　

        /// <summary>/// 获取时间戳/// </summary>/// <returns></returns>public static string GetTimeStamp(){TimeSpan ts = DateTime.UtcNow - new DateTime(1970, 1, 1, 0, 0, 0, 0);return Convert.ToInt64(ts.TotalMilliseconds).ToString();}