C#：获取时间戳

/// <summary>
/// 获取时间戳
/// </summary>
/// <param name="isMillisecond">是否需要毫秒</param>
/// <returns>当前时间戳</returns>
public static string GetTimeStamp(bool isMillisecond = false)
{
    var ts = DateTime.UtcNow - new DateTime(1970, 1, 1, 0, 0, 0, 0);
    var timeStamp = isMillisecond ? Convert.ToInt64(ts.TotalSeconds).ToString() : Convert.ToInt64(ts.TotalMilliseconds).ToString();
    return timeStamp;
}